diff --git a/.gitignore b/.gitignore
index f8e0715..2261aa9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -21,6 +21,7 @@ build/
 !.env.example
 config/local.toml
 private/
+.runtime/
 
 # Real laboratory captures and decoded artifacts are sensitive and large.
 captures/
diff --git a/apps/control-station/src/App.tsx b/apps/control-station/src/App.tsx
index 5d75cd7..98f49a9 100644
--- a/apps/control-station/src/App.tsx
+++ b/apps/control-station/src/App.tsx
@@ -133,7 +133,10 @@ export default function App() {
   const activeSceneWindow = sceneWindowOrder[sceneWindowOrder.length - 1] ?? null;
   const automaticSourceUrl = runtime.state?.spatialSource?.url.trim() ?? "";
   const effectiveSourceUrl = sourceUrl || automaticSourceUrl;
-  const observationLayout = useObservationLayout(runtime.state?.observationSources ?? []);
+  const observationLayout = useObservationLayout(
+    runtime.state?.observationSources ?? [],
+    runtime.setObservationSourceActive,
+  );
 
   useEffect(() => {
     const remote = runtime.state?.viewerSettings;
diff --git a/apps/control-station/src/components/MseFmp4WebSocketPlayer.tsx b/apps/control-station/src/components/MseFmp4WebSocketPlayer.tsx
new file mode 100644
index 0000000..3588e62
--- /dev/null
+++ b/apps/control-station/src/components/MseFmp4WebSocketPlayer.tsx
@@ -0,0 +1,279 @@
+import { useEffect, useRef, useState } from "react";
+import { Icon } from "@nodedc/ui-react";
+
+import type { ObservationSourceDelivery } from "../core/runtime/contracts";
+
+type PlayerStatus = "connecting" | "buffering" | "playing" | "error";
+
+export interface CameraLeaseRetryBudget {
+  deliveryId: string;
+  count: number;
+}
+
+const CAMERA_LEASE_RETRY_DELAYS = [400, 1_000, 2_000] as const;
+
+export function resetCameraLeaseRetryBudget(deliveryId: string): CameraLeaseRetryBudget {
+  return { deliveryId, count: 0 };
+}
+
+export function consumeCameraLeaseRetry(
+  current: CameraLeaseRetryBudget,
+  deliveryId: string,
+): { budget: CameraLeaseRetryBudget; delay: number | null } {
+  const count = current.deliveryId === deliveryId ? current.count : 0;
+  const delay = CAMERA_LEASE_RETRY_DELAYS[count] ?? null;
+  return {
+    budget: { deliveryId, count: delay === null ? count : count + 1 },
+    delay,
+  };
+}
+
+function websocketUrl(path: string): string {
+  const url = new URL(path, window.location.href);
+  if (url.protocol === "http:") url.protocol = "ws:";
+  if (url.protocol === "https:") url.protocol = "wss:";
+  if (url.protocol !== "ws:" && url.protocol !== "wss:") {
+    throw new Error("Адаптер вернул неподдерживаемый адрес видеопотока.");
+  }
+  return url.toString();
+}
+
+export function MseFmp4WebSocketPlayer({
+  delivery,
+  label,
+}: {
+  delivery: ObservationSourceDelivery & { kind: "mse-fmp4-websocket" };
+  label: string;
+}) {
+  const videoRef = useRef<HTMLVideoElement>(null);
+  const leaseRetryRef = useRef(resetCameraLeaseRetryBudget(delivery.id));
+  const [attempt, setAttempt] = useState(0);
+  const [status, setStatus] = useState<PlayerStatus>("connecting");
+  const [message, setMessage] = useState("Подключение к локальному видеопотоку");
+
+  useEffect(() => {
+    const video = videoRef.current;
+    if (!video) return;
+
+    let disposed = false;
+    let socket: WebSocket | null = null;
+    let sourceBuffer: SourceBuffer | null = null;
+    let objectUrl = "";
+    let retryTimer: number | undefined;
+    let receivedMedia = false;
+    let failed = false;
+    const queue: ArrayBuffer[] = [];
+    let queuedBytes = 0;
+
+    const fail = (copy: string) => {
+      if (disposed || failed) return;
+      failed = true;
+      setStatus("error");
+      setMessage(copy);
+      try {
+        if (socket && socket.readyState < WebSocket.CLOSING) {
+          socket.close(1011, "Live video buffer reset");
+        }
+      } catch {
+        // The manual reconnect button will create a fresh transport and MSE buffer.
+      }
+    };
+
+    const retryLease = () => {
+      const retry = consumeCameraLeaseRetry(leaseRetryRef.current, delivery.id);
+      leaseRetryRef.current = retry.budget;
+      if (retry.delay === null) {
+        fail("Camera adapter ещё занят предыдущим окном. Подключитесь повторно.");
+        return;
+      }
+      setStatus("connecting");
+      setMessage("Освобождение предыдущего окна камеры");
+      retryTimer = window.setTimeout(() => {
+        if (!disposed) setAttempt((value) => value + 1);
+      }, retry.delay);
+    };
+
+    const onPlaying = () => {
+      if (disposed) return;
+      leaseRetryRef.current = resetCameraLeaseRetryBudget(delivery.id);
+      setStatus("playing");
+      setMessage("");
+    };
+
+    video.addEventListener("playing", onPlaying);
+
+    const appendNext = () => {
+      if (disposed || !sourceBuffer || sourceBuffer.updating || queue.length === 0) return;
+      const chunk = queue.shift();
+      if (!chunk) return;
+      queuedBytes -= chunk.byteLength;
+      try {
+        sourceBuffer.appendBuffer(chunk);
+      } catch (error) {
+        fail(error instanceof DOMException && error.name === "QuotaExceededError"
+          ? "Live-буфер переполнен и сброшен, чтобы не накапливать задержку."
+          : "Не удалось добавить видеосегмент. Повторите подключение.");
+      }
+    };
+
+    const enqueue = (chunk: ArrayBuffer) => {
+      if (disposed || chunk.byteLength === 0) return;
+      // Never drop arbitrary fMP4 fragments: the following samples may depend
+      // on them. A bounded reset is safer and keeps live latency deterministic.
+      if (queuedBytes + chunk.byteLength > 2 * 1024 * 1024) {
+        fail("Видеодекодер не успевает за эфиром. Live-буфер сброшен.");
+        return;
+      }
+      queue.push(chunk);
+      queuedBytes += chunk.byteLength;
+      appendNext();
+    };
+
+    const mediaType = delivery.mediaType?.trim();
+    if (typeof MediaSource === "undefined") {
+      fail("Этот браузер не поддерживает Media Source Extensions.");
+      return;
+    }
+    if (!mediaType || !MediaSource.isTypeSupported(mediaType)) {
+      fail(mediaType
+        ? `Браузер не поддерживает ${mediaType}`
+        : "Адаптер не сообщил MIME/codec fMP4-потока.");
+      return;
+    }
+
+    setStatus("connecting");
+    setMessage("Подключение к локальному видеопотоку");
+    const mediaSource = new MediaSource();
+    objectUrl = URL.createObjectURL(mediaSource);
+    video.src = objectUrl;
+
+    const onSourceOpen = () => {
+      if (disposed) return;
+      try {
+        sourceBuffer = mediaSource.addSourceBuffer(mediaType);
+      } catch {
+        fail("Не удалось создать MSE-буфер для указанного кодека.");
+        return;
+      }
+
+      sourceBuffer.addEventListener("updateend", () => {
+        if (disposed || !sourceBuffer) return;
+        const buffered = sourceBuffer.buffered;
+        if (buffered.length > 0) {
+          const end = buffered.end(buffered.length - 1);
+          const start = buffered.start(0);
+          if (end - video.currentTime > 1) video.currentTime = Math.max(0, end - 0.1);
+          if (!receivedMedia) {
+            receivedMedia = true;
+            setStatus("buffering");
+            setMessage("Запуск первого декодированного кадра");
+            void video.play().catch(() => undefined);
+          }
+          const removeBefore = end - 3;
+          if (removeBefore > start && !sourceBuffer.updating) {
+            try {
+              sourceBuffer.remove(0, removeBefore);
+              return;
+            } catch {
+              // Continue appending; quota handling performs a clean reset.
+            }
+          }
+        }
+        appendNext();
+      });
+      sourceBuffer.addEventListener("error", () => {
+        fail("MSE сообщил об ошибке декодирования видеосегмента.");
+      });
+
+      try {
+        socket = new WebSocket(websocketUrl(delivery.url));
+      } catch (error) {
+        fail(error instanceof Error ? error.message : "Некорректный адрес видеопотока.");
+        return;
+      }
+      socket.binaryType = "arraybuffer";
+      socket.addEventListener("open", () => {
+        if (disposed) return;
+        setStatus("buffering");
+        setMessage("Ожидание первого видеокадра");
+      });
+      socket.addEventListener("message", (event) => {
+        if (event.data instanceof ArrayBuffer) {
+          enqueue(event.data);
+        } else if (event.data instanceof Blob) {
+          void event.data.arrayBuffer().then(enqueue).catch(() => {
+            fail("Получен повреждённый видеосегмент.");
+          });
+        }
+      });
+      socket.addEventListener("error", () => {
+        fail("Соединение с локальным video adapter потеряно.");
+      });
+      socket.addEventListener("close", (event) => {
+        if (!disposed && !failed && event.code === 1008) {
+          retryLease();
+        } else if (!disposed) {
+          fail(event.code === 1000
+            ? "Видеопоток завершён. Можно подключиться повторно."
+            : "Видеопоток прерван. Проверьте устройство и повторите подключение.");
+        }
+      });
+    };
+
+    mediaSource.addEventListener("sourceopen", onSourceOpen, { once: true });
+
+    return () => {
+      disposed = true;
+      if (retryTimer !== undefined) window.clearTimeout(retryTimer);
+      queue.length = 0;
+      socket?.close(1000, "Источник скрыт оператором");
+      video.removeEventListener("playing", onPlaying);
+      try {
+        if (sourceBuffer?.updating) sourceBuffer.abort();
+      } catch {
+        // The MediaSource can already be closing.
+      }
+      try {
+        if (mediaSource.readyState === "open") mediaSource.endOfStream();
+      } catch {
+        // Cleanup must continue even if the browser has already detached MSE.
+      }
+      video.pause();
+      video.removeAttribute("src");
+      video.load();
+      if (objectUrl) URL.revokeObjectURL(objectUrl);
+    };
+  }, [attempt, delivery.id, delivery.mediaType, delivery.url]);
+
+  return (
+    <div className="mse-fmp4-player" data-status={status}>
+      <video
+        ref={videoRef}
+        className="observation-media__asset"
+        aria-label={label}
+        autoPlay
+        muted
+        playsInline
+      />
+      {status !== "playing" ? (
+        <div className="mse-fmp4-player__status" role="status" aria-live="polite">
+          <Icon name={status === "error" ? "alert" : "video"} size={20} />
+          <strong>{status === "error" ? "Канал прерван" : "Подготовка камеры"}</strong>
+          <span>{message}</span>
+          {status === "error" ? (
+            <button
+              type="button"
+              onClick={() => {
+                leaseRetryRef.current = resetCameraLeaseRetryBudget(delivery.id);
+                setAttempt((value) => value + 1);
+              }}
+            >
+              <Icon name="refresh" size={14} />
+              Подключиться повторно
+            </button>
+          ) : null}
+        </div>
+      ) : null}
+    </div>
+  );
+}
diff --git a/apps/control-station/src/components/ObservationSources.tsx b/apps/control-station/src/components/ObservationSources.tsx
index 659b243..8ff5b9b 100644
--- a/apps/control-station/src/components/ObservationSources.tsx
+++ b/apps/control-station/src/components/ObservationSources.tsx
@@ -5,6 +5,7 @@ import type {
   ObservationSourceDescriptor,
   ObservationSourceModality,
 } from "../core/runtime/contracts";
+import { MseFmp4WebSocketPlayer } from "./MseFmp4WebSocketPlayer";
 
 const sourceIcon: Record<ObservationSourceModality, IconName> = {
   "point-cloud": "globe",
@@ -29,7 +30,38 @@ export function observationSourceStatusLabel(source: ObservationSourceDescriptor
 }
 
 export function ObservationMedia({ source }: { source: ObservationSourceDescriptor }) {
-  if (source.previewUrl && source.modality === "video") {
+  const sourceSelected = source.activation ? source.activation.selected : true;
+  const deliveryActive = Boolean(source.delivery && sourceSelected);
+
+  if (
+    deliveryActive &&
+    source.delivery?.kind === "mse-fmp4-websocket" &&
+    source.modality === "video"
+  ) {
+    return <MseFmp4WebSocketPlayer delivery={source.delivery} label={source.label} />;
+  }
+
+  if (deliveryActive && source.delivery?.kind === "video-url" && source.modality === "video") {
+    return (
+      <video
+        className="observation-media__asset"
+        src={source.delivery.url}
+        autoPlay
+        muted
+        playsInline
+      />
+    );
+  }
+
+  if (
+    deliveryActive &&
+    source.delivery?.kind === "image-url" &&
+    (source.modality === "image" || source.modality === "depth")
+  ) {
+    return <img className="observation-media__asset" src={source.delivery.url} alt={source.label} />;
+  }
+
+  if (sourceSelected && source.previewUrl && source.modality === "video") {
     return (
       <video
         className="observation-media__asset"
@@ -41,7 +73,11 @@ export function ObservationMedia({ source }: { source: ObservationSourceDescript
     );
   }
 
-  if (source.previewUrl && (source.modality === "image" || source.modality === "depth")) {
+  if (
+    sourceSelected &&
+    source.previewUrl &&
+    (source.modality === "image" || source.modality === "depth")
+  ) {
     return <img className="observation-media__asset" src={source.previewUrl} alt={source.label} />;
   }
 
@@ -51,7 +87,11 @@ export function ObservationMedia({ source }: { source: ObservationSourceDescript
       <strong>{observationSourceStatusLabel(source)}</strong>
       <span>
         {source.modality === "video"
-          ? "Канал известен, browser-preview ещё не подключён"
+          ? source.activation?.controllable
+            ? source.activation.selected
+              ? "Повторите подключение — локальный адаптер перезапустит выбранную камеру"
+              : "Откройте канал — локальный адаптер подключит выбранную камеру"
+            : "Канал известен, browser-preview сейчас недоступен"
           : source.description}
       </span>
     </div>
@@ -61,11 +101,13 @@ export function ObservationMedia({ source }: { source: ObservationSourceDescript
 export function ObservationSourcePicker({
   sources,
   visibleSourceIds,
+  pendingSourceIds,
   onToggle,
 }: {
   sources: readonly ObservationSourceDescriptor[];
   visibleSourceIds: ReadonlySet<string>;
-  onToggle: (sourceId: string) => void;
+  pendingSourceIds?: ReadonlySet<string>;
+  onToggle: (sourceId: string) => void | Promise<boolean>;
 }) {
   const visibleCount = sources.filter((source) => visibleSourceIds.has(source.id)).length;
 
@@ -108,6 +150,14 @@ export function ObservationSourcePicker({
         <div className="observation-source-menu__list">
           {sources.map((source) => {
             const selected = visibleSourceIds.has(source.id);
+            const pending = pendingSourceIds?.has(source.id) ?? false;
+            const canOpen = Boolean(
+              selected ||
+              source.modality === "point-cloud" ||
+              source.previewUrl ||
+              source.delivery ||
+              source.activation?.controllable,
+            );
             return (
               <button
                 key={source.id}
@@ -115,7 +165,8 @@ export function ObservationSourcePicker({
                 className="nodedc-dropdown-option observation-source-option"
                 data-selected={selected ? "true" : undefined}
                 aria-pressed={selected}
-                onClick={() => onToggle(source.id)}
+                disabled={pending || !canOpen}
+                onClick={() => void onToggle(source.id)}
               >
                 <span className="nodedc-dropdown-option__icon">
                   <Icon name={sourceIcon[source.modality]} size={16} />
@@ -124,7 +175,7 @@ export function ObservationSourcePicker({
                   <span className="nodedc-dropdown-option__label">{source.label}</span>
                   <span className="nodedc-dropdown-option__description">
                     <i data-availability={source.availability} aria-hidden="true" />
-                    {observationSourceStatusLabel(source)} · {source.endpointLabel || source.transport}
+                    {pending ? "Переключение" : observationSourceStatusLabel(source)} · {source.endpointLabel || source.transport}
                   </span>
                 </span>
                 <span className="nodedc-dropdown-option__check">
diff --git a/apps/control-station/src/components/RerunViewport.tsx b/apps/control-station/src/components/RerunViewport.tsx
index d4d70fd..67c521a 100644
--- a/apps/control-station/src/components/RerunViewport.tsx
+++ b/apps/control-station/src/components/RerunViewport.tsx
@@ -10,21 +10,25 @@ export interface RerunSelection {
 
 export interface RerunViewportProps {
   sourceUrl: string;
+  followLive?: boolean;
   onStatusChange?: (status: RerunViewportStatus, message?: string) => void;
   onSelectionChange?: (selection: RerunSelection | null) => void;
 }
 
 export function RerunViewport({
   sourceUrl,
+  followLive = false,
   onStatusChange,
   onSelectionChange,
 }: RerunViewportProps) {
   const hostRef = useRef<HTMLDivElement>(null);
   const [status, setStatus] = useState<RerunViewportStatus>(sourceUrl ? "loading" : "idle");
+  const [retryNonce, setRetryNonce] = useState(0);
 
   useEffect(() => {
     const normalizedSource = sourceUrl.trim();
-    if (!normalizedSource || !hostRef.current) {
+    const host = hostRef.current;
+    if (!normalizedSource || !host) {
       setStatus("idle");
       onStatusChange?.("idle");
       onSelectionChange?.(null);
@@ -32,51 +36,86 @@ export function RerunViewport({
     }
 
     let disposed = false;
-    let stopViewer: (() => void) | undefined;
+    let disposeViewer: (() => void) | undefined;
+    let recordingOpenTimer: number | undefined;
+    let recordingOpened = false;
     const unsubscribers: Array<() => void> = [];
+    const unsubscribeAll = () => {
+      while (unsubscribers.length > 0) {
+        const unsubscribe = unsubscribers.pop();
+        try {
+          unsubscribe?.();
+        } catch {
+          // A stopped vendor viewer can already have released its event map.
+        }
+      }
+    };
+    const clearRecordingOpenTimer = () => {
+      if (recordingOpenTimer === undefined) return;
+      window.clearTimeout(recordingOpenTimer);
+      recordingOpenTimer = undefined;
+    };
+    const reportError = (message: string) => {
+      if (disposed) return;
+      setStatus("error");
+      onStatusChange?.("error", message);
+    };
+
+    host.replaceChildren();
     setStatus("loading");
     onStatusChange?.("loading");
 
     void import("@rerun-io/web-viewer")
       .then(async ({ WebViewer }) => {
+        // React StrictMode intentionally disposes the first effect while the
+        // dynamic import is still pending. Never start that stale viewer (the
+        // vendor API treats a missing host as document.body).
+        if (disposed) return;
+
         const viewer = new WebViewer();
-        stopViewer = () => {
-          // Remove the gRPC receiver explicitly before tearing down WASM. This
-          // closes the browser-side stream promptly so the local SDK server can
-          // release its port before the next device session starts.
+        let viewerDisposed = false;
+        disposeViewer = () => {
+          if (viewerDisposed) return;
+          viewerDisposed = true;
+          clearRecordingOpenTimer();
+          unsubscribeAll();
           try {
-            viewer.close(normalizedSource);
+            if (viewer.ready) viewer.close(normalizedSource);
           } catch {
-            // The viewer can already be stopped after a startup failure.
+            // The receiver may already be gone after a transport failure.
           }
-          viewer.stop();
+          try {
+            viewer.stop();
+          } catch {
+            // A partially initialized WASM handle can already be gone after a
+            // startup failure. The host still has to be cleared below.
+          }
+          host.replaceChildren();
         };
 
-        await viewer.start(
-          normalizedSource,
-          hostRef.current,
-          {
-            width: "100%",
-            height: "100%",
-            theme: "dark",
-            hide_welcome_screen: true,
-            enable_history: false,
-            allow_fullscreen: false,
-          },
-          null,
+        unsubscribers.push(
+          viewer.on("recording_open", (event) => {
+            if (disposed) return;
+            recordingOpened = true;
+            clearRecordingOpenTimer();
+            if (followLive) {
+              try {
+                // The backend blueprint owns native `Following`; the host only
+                // selects its live timeline once. Repeated SetTime calls would
+                // force Rerun out of Following and create needless repaints.
+                viewer.set_active_timeline(event.recording_id, "stream_time");
+              } catch {
+                // A receiver can disappear between the event and the WASM call.
+              }
+            }
+            setStatus("ready");
+            onStatusChange?.("ready");
+          }),
         );
-        if (disposed) {
-          stopViewer();
-          return;
-        }
-
-        viewer.override_panel_state("top", "hidden");
-        viewer.override_panel_state("blueprint", "hidden");
-        viewer.override_panel_state("selection", "hidden");
-        viewer.override_panel_state("time", "hidden");
 
         unsubscribers.push(
           viewer.on("selection_change", (event) => {
+            if (disposed) return;
             const entity = event.items.find((item) => item.type === "entity");
             if (!entity || entity.type !== "entity") {
               onSelectionChange?.(null);
@@ -90,23 +129,54 @@ export function RerunViewport({
           }),
         );
 
-        setStatus("ready");
-        onStatusChange?.("ready");
+        try {
+          await viewer.start(
+            normalizedSource,
+            host,
+            {
+              width: "100%",
+              height: "100%",
+              theme: "dark",
+              hide_welcome_screen: true,
+              enable_history: false,
+              allow_fullscreen: false,
+            },
+            null,
+          );
+          if (disposed) {
+            disposeViewer();
+            return;
+          }
+
+          viewer.override_panel_state("top", "hidden");
+          viewer.override_panel_state("blueprint", "hidden");
+          viewer.override_panel_state("selection", "hidden");
+          viewer.override_panel_state("time", "hidden");
+
+          if (!recordingOpened) {
+            recordingOpenTimer = window.setTimeout(() => {
+              reportError("Визуализатор запущен, но поток записи не открылся.");
+            }, 12_000);
+          }
+        } catch {
+          disposeViewer();
+          reportError("Не удалось запустить встроенный визуализатор.");
+        }
       })
       .catch(() => {
         if (disposed) return;
-        const message = "Не удалось запустить встроенный визуализатор.";
-        setStatus("error");
-        onStatusChange?.("error", message);
+        disposeViewer?.();
+        reportError("Не удалось загрузить модуль визуализатора.");
       });
 
     return () => {
       disposed = true;
-      unsubscribers.forEach((unsubscribe) => unsubscribe());
-      stopViewer?.();
+      clearRecordingOpenTimer();
+      unsubscribeAll();
+      disposeViewer?.();
       onSelectionChange?.(null);
     };
-  }, [onSelectionChange, onStatusChange, sourceUrl]);
+  }, [followLive, onSelectionChange, onStatusChange, retryNonce, sourceUrl]);
 
   return (
     <div className="rerun-viewport" data-status={status}>
@@ -124,7 +194,14 @@ export function RerunViewport({
         <div className="rerun-viewport__notice rerun-viewport__notice--error" role="alert">
           <div>
             <strong>Источник не открыт</strong>
-            <span>Проверьте адрес RRD или Rerun gRPC в настройках источника.</span>
+            <span>Проверьте локальный поток Rerun или повторите подключение.</span>
+            <button
+              type="button"
+              className="rerun-viewport__retry"
+              onClick={() => setRetryNonce((nonce) => nonce + 1)}
+            >
+              Повторить подключение
+            </button>
           </div>
         </div>
       ) : null}
diff --git a/apps/control-station/src/core/observation/layoutPolicy.ts b/apps/control-station/src/core/observation/layoutPolicy.ts
new file mode 100644
index 0000000..853254b
--- /dev/null
+++ b/apps/control-station/src/core/observation/layoutPolicy.ts
@@ -0,0 +1,68 @@
+import type { ObservationSourceDescriptor } from "../runtime/contracts";
+
+export interface ObservationVisibilityChange {
+  visibleIds: string[];
+  removedIds: string[];
+}
+
+export function shouldRestartObservationSource(
+  source: ObservationSourceDescriptor,
+): boolean {
+  return Boolean(
+    source.activation?.selected &&
+    source.activation.controllable &&
+    (source.availability === "error" || !source.delivery),
+  );
+}
+
+export function openObservationSource(
+  currentIds: readonly string[],
+  sourceId: string,
+  sources: readonly ObservationSourceDescriptor[],
+): ObservationVisibilityChange {
+  const source = sources.find((candidate) => candidate.id === sourceId);
+  if (!source) return { visibleIds: [...currentIds], removedIds: [] };
+
+  const uniqueCurrent = [...new Set(currentIds)];
+  const activation = source.activation;
+  if (!activation) {
+    return {
+      visibleIds: uniqueCurrent.includes(sourceId) ? uniqueCurrent : [...uniqueCurrent, sourceId],
+      removedIds: [],
+    };
+  }
+
+  const groupSourceIds = new Set(
+    sources
+      .filter((candidate) => candidate.activation?.groupId === activation.groupId)
+      .map((candidate) => candidate.id),
+  );
+  const capacity = Math.max(1, Math.floor(activation.maxActive));
+  const currentPeers = uniqueCurrent.filter(
+    (candidate) => candidate !== sourceId && groupSourceIds.has(candidate),
+  );
+  const retainedPeerCount = Math.max(0, capacity - 1);
+  const retainedPeers = new Set(
+    retainedPeerCount > 0 ? currentPeers.slice(-retainedPeerCount) : [],
+  );
+  const visibleIds = uniqueCurrent.filter(
+    (candidate) => !groupSourceIds.has(candidate) || retainedPeers.has(candidate),
+  );
+  if (!visibleIds.includes(sourceId)) visibleIds.push(sourceId);
+  const visibleSet = new Set(visibleIds);
+  return {
+    visibleIds,
+    removedIds: uniqueCurrent.filter((candidate) => !visibleSet.has(candidate)),
+  };
+}
+
+export function closeObservationSource(
+  currentIds: readonly string[],
+  sourceId: string,
+): ObservationVisibilityChange {
+  const visibleIds = currentIds.filter((candidate) => candidate !== sourceId);
+  return {
+    visibleIds,
+    removedIds: visibleIds.length === currentIds.length ? [] : [sourceId],
+  };
+}
diff --git a/apps/control-station/src/core/observation/useObservationLayout.ts b/apps/control-station/src/core/observation/useObservationLayout.ts
index 0a4e73d..45834f8 100644
--- a/apps/control-station/src/core/observation/useObservationLayout.ts
+++ b/apps/control-station/src/core/observation/useObservationLayout.ts
@@ -1,6 +1,11 @@
 import { useCallback, useEffect, useMemo, useRef, useState } from "react";
 
 import type { ObservationSourceDescriptor } from "../runtime/contracts";
+import {
+  closeObservationSource,
+  openObservationSource,
+  shouldRestartObservationSource,
+} from "./layoutPolicy";
 
 export interface ObservationWindowRect {
   x: number;
@@ -15,8 +20,9 @@ export interface ObservationLayoutController {
   activeFloatingSourceId: string | null;
   maximizedFloatingSourceId: string | null;
   windowRects: Readonly<Record<string, ObservationWindowRect>>;
-  toggleSource: (sourceId: string) => void;
-  hideSource: (sourceId: string) => void;
+  pendingSourceIds: ReadonlySet<string>;
+  toggleSource: (sourceId: string) => Promise<boolean>;
+  hideSource: (sourceId: string) => Promise<boolean>;
   setFocusedSourceId: (sourceId: string | null) => void;
   activateFloatingSource: (sourceId: string) => void;
   setFloatingMaximized: (sourceId: string, maximized: boolean) => void;
@@ -26,7 +32,11 @@ export interface ObservationLayoutController {
 function canOpenByDefault(source: ObservationSourceDescriptor): boolean {
   if (!source.capabilities.defaultVisible) return false;
   if (source.availability === "unavailable" || source.availability === "error") return false;
-  return source.modality === "point-cloud" || Boolean(source.previewUrl);
+  return (
+    source.modality === "point-cloud" ||
+    Boolean(source.previewUrl) ||
+    Boolean(source.delivery && (!source.activation || source.activation.selected))
+  );
 }
 
 function catalogIdentity(sources: readonly ObservationSourceDescriptor[]): string {
@@ -42,8 +52,11 @@ function catalogIdentity(sources: readonly ObservationSourceDescriptor[]): strin
 
 export function useObservationLayout(
   sources: readonly ObservationSourceDescriptor[],
+  setSourceActive?: (sourceId: string, active: boolean) => Promise<boolean>,
 ): ObservationLayoutController {
   const [visibleIds, setVisibleIds] = useState<string[]>([]);
+  const visibleIdsRef = useRef<string[]>([]);
+  const [pendingIds, setPendingIds] = useState<string[]>([]);
   const [focusedSourceId, setFocusedSourceIdState] = useState<string | null>(null);
   const [activeFloatingSourceId, setActiveFloatingSourceId] = useState<string | null>(null);
   const [maximizedFloatingSourceId, setMaximizedFloatingSourceId] = useState<string | null>(null);
@@ -54,11 +67,23 @@ export function useObservationLayout(
   const sourceIds = useMemo(() => new Set(sourceIdList), [sourceIdsIdentity]);
   const identity = catalogIdentity(sources);
 
+  const commitVisibleIds = useCallback((next: string[]) => {
+    visibleIdsRef.current = next;
+    setVisibleIds(next);
+  }, []);
+
+  const clearPresentation = useCallback((removedIds: readonly string[]) => {
+    if (!removedIds.length) return;
+    const removed = new Set(removedIds);
+    setFocusedSourceIdState((current) => current && removed.has(current) ? null : current);
+    setActiveFloatingSourceId((current) => current && removed.has(current) ? null : current);
+    setMaximizedFloatingSourceId((current) => current && removed.has(current) ? null : current);
+  }, []);
+
   useEffect(() => {
-    setVisibleIds((current) => {
-      const next = current.filter((sourceId) => sourceIds.has(sourceId));
-      return next.length === current.length ? current : next;
-    });
+    const currentVisible = visibleIdsRef.current;
+    const nextVisible = currentVisible.filter((sourceId) => sourceIds.has(sourceId));
+    if (nextVisible.length !== currentVisible.length) commitVisibleIds(nextVisible);
     setFocusedSourceIdState((current) => current && sourceIds.has(current) ? current : null);
     setActiveFloatingSourceId((current) => current && sourceIds.has(current) ? current : null);
     setMaximizedFloatingSourceId((current) => current && sourceIds.has(current) ? current : null);
@@ -67,7 +92,7 @@ export function useObservationLayout(
       const nextEntries = entries.filter(([sourceId]) => sourceIds.has(sourceId));
       return nextEntries.length === entries.length ? current : Object.fromEntries(nextEntries);
     });
-  }, [sourceIds]);
+  }, [commitVisibleIds, sourceIds]);
 
   useEffect(() => {
     if (!identity) {
@@ -76,30 +101,91 @@ export function useObservationLayout(
     }
     if (initializedCatalog.current === identity) return;
     initializedCatalog.current = identity;
-    const defaults = sources
-      .filter(canOpenByDefault)
-      .map((source) => source.id);
-    setVisibleIds(defaults);
+    let defaults: string[] = [];
+    for (const source of sources.filter(canOpenByDefault)) {
+      defaults = openObservationSource(defaults, source.id, sources).visibleIds;
+    }
+    commitVisibleIds(defaults);
     const firstFloating = sources.find(
       (source) => canOpenByDefault(source) && source.capabilities.overlay,
     );
     setActiveFloatingSourceId(firstFloating?.id ?? null);
-  }, [identity, sources]);
+  }, [commitVisibleIds, identity, sources]);
 
-  const toggleSource = useCallback((sourceId: string) => {
-    const selected = visibleIds.includes(sourceId);
-    setVisibleIds((current) => selected
-      ? current.filter((candidate) => candidate !== sourceId)
-      : current.includes(sourceId) ? current : [...current, sourceId]);
-    if (!selected) setActiveFloatingSourceId(sourceId);
-  }, [visibleIds]);
+  const selectedDeliveryIdentity = sources
+    .filter((source) => source.capabilities.defaultVisible && source.activation?.selected && source.delivery)
+    .map((source) => [
+      source.id,
+      source.delivery?.id,
+      source.activation?.groupId,
+      source.activation?.maxActive,
+    ].join(":"))
+    .sort()
+    .join("|");
 
-  const hideSource = useCallback((sourceId: string) => {
-    setVisibleIds((current) => current.filter((candidate) => candidate !== sourceId));
-    setFocusedSourceIdState((current) => current === sourceId ? null : current);
-    setActiveFloatingSourceId((current) => current === sourceId ? null : current);
-    setMaximizedFloatingSourceId((current) => current === sourceId ? null : current);
-  }, []);
+  useEffect(() => {
+    const selected = sources.filter(
+      (source) => source.capabilities.defaultVisible && source.activation?.selected && source.delivery,
+    );
+    if (!selected.length) return;
+    let change = { visibleIds: visibleIdsRef.current, removedIds: [] as string[] };
+    const removed = new Set<string>();
+    for (const source of selected) {
+      change = openObservationSource(change.visibleIds, source.id, sources);
+      change.removedIds.forEach((sourceId) => removed.add(sourceId));
+    }
+    commitVisibleIds(change.visibleIds);
+    clearPresentation([...removed]);
+  }, [clearPresentation, commitVisibleIds, selectedDeliveryIdentity]);
+
+  const markPending = useCallback((source: ObservationSourceDescriptor, pending: boolean) => {
+    const groupId = source.activation?.groupId;
+    const affected = groupId
+      ? sources.filter((candidate) => candidate.activation?.groupId === groupId).map(({ id }) => id)
+      : [source.id];
+    setPendingIds((current) => pending
+      ? [...new Set([...current, ...affected])]
+      : current.filter((candidate) => !affected.includes(candidate)));
+  }, [sources]);
+
+  const hideSource = useCallback(async (sourceId: string) => {
+    const source = sources.find((candidate) => candidate.id === sourceId);
+    if (!source) return false;
+    if (source.activation?.selected && source.activation.controllable) {
+      if (!setSourceActive) return false;
+      markPending(source, true);
+      try {
+        if (!await setSourceActive(source.sourceId, false)) return false;
+      } finally {
+        markPending(source, false);
+      }
+    }
+    const change = closeObservationSource(visibleIdsRef.current, sourceId);
+    commitVisibleIds(change.visibleIds);
+    clearPresentation(change.removedIds);
+    return true;
+  }, [clearPresentation, commitVisibleIds, markPending, setSourceActive, sources]);
+
+  const toggleSource = useCallback(async (sourceId: string) => {
+    const source = sources.find((candidate) => candidate.id === sourceId);
+    if (!source) return false;
+    const restart = shouldRestartObservationSource(source);
+    if (visibleIdsRef.current.includes(sourceId) && !restart) return hideSource(sourceId);
+    if (source.activation && (!source.activation.selected || restart)) {
+      if (!source.activation.controllable || !setSourceActive) return false;
+      markPending(source, true);
+      try {
+        if (!await setSourceActive(source.sourceId, true)) return false;
+      } finally {
+        markPending(source, false);
+      }
+    }
+    const change = openObservationSource(visibleIdsRef.current, sourceId, sources);
+    commitVisibleIds(change.visibleIds);
+    clearPresentation(change.removedIds);
+    setActiveFloatingSourceId(sourceId);
+    return true;
+  }, [clearPresentation, commitVisibleIds, hideSource, markPending, setSourceActive, sources]);
 
   const setFocusedSourceId = useCallback((sourceId: string | null) => {
     setFocusedSourceIdState(sourceId);
@@ -120,6 +206,7 @@ export function useObservationLayout(
   }, []);
 
   const visibleSourceIds = useMemo(() => new Set(visibleIds), [visibleIds]);
+  const pendingSourceIds = useMemo(() => new Set(pendingIds), [pendingIds]);
 
   return {
     visibleSourceIds,
@@ -127,6 +214,7 @@ export function useObservationLayout(
     activeFloatingSourceId,
     maximizedFloatingSourceId,
     windowRects,
+    pendingSourceIds,
     toggleSource,
     hideSource,
     setFocusedSourceId,
diff --git a/apps/control-station/src/core/runtime/MissionRuntimeContext.tsx b/apps/control-station/src/core/runtime/MissionRuntimeContext.tsx
index 0e88987..4a14c29 100644
--- a/apps/control-station/src/core/runtime/MissionRuntimeContext.tsx
+++ b/apps/control-station/src/core/runtime/MissionRuntimeContext.tsx
@@ -12,6 +12,7 @@ const idleRuntime: MissionRuntimeController = {
   pendingAction: null,
   refresh: () => undefined,
   updateViewerSettings: async () => false,
+  setObservationSourceActive: async () => false,
 };
 
 const MissionRuntimeContext = createContext<MissionRuntimeController>(idleRuntime);
diff --git a/apps/control-station/src/core/runtime/contracts.ts b/apps/control-station/src/core/runtime/contracts.ts
index 0fec2bd..17175f1 100644
--- a/apps/control-station/src/core/runtime/contracts.ts
+++ b/apps/control-station/src/core/runtime/contracts.ts
@@ -111,6 +111,27 @@ export interface ObservationSourceCapabilities {
   spatialRegistration: "native" | "calibrated" | "unresolved" | "not-applicable";
 }
 
+export type ObservationSourceDelivery =
+  | {
+      id: string;
+      kind: "mse-fmp4-websocket";
+      url: string;
+      mediaType: string;
+    }
+  | {
+      id: string;
+      kind: "video-url" | "image-url";
+      url: string;
+      mediaType?: string | null;
+    };
+
+export interface ObservationSourceActivation {
+  groupId: string;
+  maxActive: number;
+  selected: boolean;
+  controllable: boolean;
+}
+
 export interface ObservationSourceDescriptor {
   id: string;
   sourceId: string;
@@ -123,6 +144,8 @@ export interface ObservationSourceDescriptor {
   transport: "rerun-grpc" | "rtsp" | "websocket" | "recording" | "other";
   endpointLabel?: string | null;
   previewUrl?: string | null;
+  delivery?: ObservationSourceDelivery | null;
+  activation?: ObservationSourceActivation | null;
   provider: ObservationSourceProvider;
   binding: ObservationSourceBinding;
   capabilities: ObservationSourceCapabilities;
@@ -157,4 +180,5 @@ export interface MissionRuntimeController {
   pendingAction: string | null;
   refresh: () => void | Promise<void>;
   updateViewerSettings: (settings: ViewerSettings) => Promise<boolean>;
+  setObservationSourceActive?: (sourceId: string, active: boolean) => Promise<boolean>;
 }
diff --git a/apps/control-station/src/device-plugins/xgrids-k1/api.ts b/apps/control-station/src/device-plugins/xgrids-k1/api.ts
index 76a4f37..1b1fcf4 100644
--- a/apps/control-station/src/device-plugins/xgrids-k1/api.ts
+++ b/apps/control-station/src/device-plugins/xgrids-k1/api.ts
@@ -122,11 +122,39 @@ export interface XgridsK1Metrics {
   [key: string]: number | null | undefined;
 }
 
+export interface XgridsCameraPreviewDelivery {
+  id: string;
+  kind: "mse-fmp4-websocket";
+  url: string;
+  media_type: string;
+}
+
+export interface XgridsCameraPreviewActivation {
+  group_id: string;
+  max_active: number;
+  selected: boolean;
+  controllable: boolean;
+}
+
+export interface XgridsCameraPreviewState {
+  phase?: string | null;
+  revision?: number | null;
+  generation?: number | null;
+  active_source_id?: string | null;
+  delivery?: XgridsCameraPreviewDelivery | null;
+}
+
 export interface XgridsSensorCatalogStream {
   stream_id: string;
+  source_id?: string | null;
+  semantic_channel_id?: string | null;
+  label?: string | null;
   sensor_kind?: string | null;
   modality?: string | null;
   availability?: string | null;
+  endpoint_label?: string | null;
+  activation?: XgridsCameraPreviewActivation | null;
+  delivery?: XgridsCameraPreviewDelivery | null;
   decode_status?: string | null;
   frame_id?: string | null;
   coordinate_convention?: string | null;
@@ -158,6 +186,7 @@ export interface XgridsK1State {
   operations?: XgridsOperation[];
   last_operation?: XgridsOperation | null;
   sensor_catalog?: XgridsSensorCatalog | null;
+  camera_preview?: XgridsCameraPreviewState | null;
 }
 
 export interface HealthResponse {
@@ -239,6 +268,16 @@ export interface ReplayRequest {
   loop?: boolean;
 }
 
+export interface SelectCameraPreviewRequest {
+  source_id: string;
+  device_session_id: string;
+}
+
+export interface StopCameraPreviewRequest {
+  device_session_id: string;
+  generation: number;
+}
+
 export class ApiError extends Error {
   readonly status: number;
 
@@ -375,6 +414,14 @@ export const xgridsK1Api = {
     return invokeState(xgridsK1Actions.compatibilityStreamStop);
   },
 
+  selectCameraPreview(body: SelectCameraPreviewRequest): Promise<XgridsK1State> {
+    return invokeState(xgridsK1Actions.cameraPreviewSelect, body);
+  },
+
+  stopCameraPreview(body: StopCameraPreviewRequest): Promise<XgridsK1State> {
+    return invokeState(xgridsK1Actions.cameraPreviewStop, body);
+  },
+
   updateViewerSettings(body: ViewerSettings): Promise<XgridsK1State> {
     return invokeState(xgridsK1Actions.viewerSettingsUpdate, body);
   },
diff --git a/apps/control-station/src/device-plugins/xgrids-k1/manifest.ts b/apps/control-station/src/device-plugins/xgrids-k1/manifest.ts
index db66319..3b712da 100644
--- a/apps/control-station/src/device-plugins/xgrids-k1/manifest.ts
+++ b/apps/control-station/src/device-plugins/xgrids-k1/manifest.ts
@@ -27,5 +27,7 @@ export const xgridsK1Actions = Object.freeze({
   compatibilityStreamStartLive: requirePluginAction(xgridsK1Manifest, "stream.start-live"),
   streamStartReplay: requirePluginAction(xgridsK1Manifest, "stream.start-replay"),
   compatibilityStreamStop: requirePluginAction(xgridsK1Manifest, "stream.stop"),
+  cameraPreviewSelect: requirePluginAction(xgridsK1Manifest, "camera.preview.select"),
+  cameraPreviewStop: requirePluginAction(xgridsK1Manifest, "camera.preview.stop"),
   viewerSettingsUpdate: requirePluginAction(xgridsK1Manifest, "viewer.settings.update"),
 });
diff --git a/apps/control-station/src/device-plugins/xgrids-k1/observationSources.ts b/apps/control-station/src/device-plugins/xgrids-k1/observationSources.ts
index f270fdc..1dcbdff 100644
--- a/apps/control-station/src/device-plugins/xgrids-k1/observationSources.ts
+++ b/apps/control-station/src/device-plugins/xgrids-k1/observationSources.ts
@@ -1,12 +1,17 @@
 import type { DeviceModelDefinition } from "../../core/device-plugins/contracts";
 import type {
   ObservationSourceAvailability,
+  ObservationSourceDelivery,
   ObservationSourceDescriptor,
   ObservationSourceProvider,
 } from "../../core/runtime/contracts";
 import { confirmedRuntimeSourceMode, effectiveAcquisition } from "./lifecycle";
 import { xgridsK1Manifest } from "./manifest";
-import type { XgridsK1State } from "./api";
+import type {
+  XgridsCameraPreviewDelivery,
+  XgridsK1State,
+  XgridsSensorCatalogStream,
+} from "./api";
 
 function providerFor(
   state: XgridsK1State,
@@ -43,19 +48,144 @@ function spatialAvailability(state: XgridsK1State): ObservationSourceAvailabilit
   return catalogDeclares(state, "spatial.point-cloud.live") ? "declared" : "unavailable";
 }
 
-function cameraAvailability(state: XgridsK1State): ObservationSourceAvailability {
-  const stream = state.sensor_catalog?.streams?.find(
-    (candidate) => candidate.stream_id === "camera.preview.live",
+function catalogAvailability(value: string | null | undefined): ObservationSourceAvailability {
+  switch (value?.trim().toLowerCase()) {
+    case "observed":
+    case "available":
+      return "available";
+    case "connecting":
+      return "connecting";
+    case "streaming":
+      return "streaming";
+    case "degraded":
+      return "degraded";
+    case "unavailable":
+      return "unavailable";
+    case "error":
+      return "error";
+    case "declared":
+      return "declared";
+    default:
+      return "unverified";
+  }
+}
+
+function cameraCatalogEntry(stream: XgridsSensorCatalogStream): boolean {
+  const sourceId = stream.source_id?.trim();
+  const semanticChannelId = stream.semantic_channel_id?.trim();
+  if (!sourceId || !semanticChannelId) return false;
+  const modality = stream.modality?.trim().toLowerCase();
+  const sensorKind = stream.sensor_kind?.trim().toLowerCase();
+  return (
+    modality === "encoded-video" ||
+    modality === "video" ||
+    sensorKind === "camera" ||
+    semanticChannelId.startsWith("camera.")
   );
-  const compatibilityProfileId =
-    state.device_session?.compatibility_profile_id ?? state.compatibility?.profile_id ?? null;
-  if (!stream) return "unavailable";
-  if (stream.availability !== "observed" || !compatibilityProfileId) return "unverified";
+}
+
+function safeEndpointLabel(value: string | null | undefined): string | null {
+  const label = value?.trim();
+  if (!label || label.length > 128) return null;
+  if (label.includes("://") || /(?:^|\D)(?:\d{1,3}\.){3}\d{1,3}(?:\D|$)/.test(label)) {
+    return null;
+  }
+  return label;
+}
+
+const SENSITIVE_QUERY_KEYS = new Set([
+  "accesskey", "accesstoken", "apikey", "auth", "authorization", "clientsecret",
+  "credential", "credentials", "password", "passwd", "passphrase", "privatekey",
+  "psk", "pwd", "refreshtoken", "secret", "sessionkey", "token", "user",
+  "username", "wifipassword",
+]);
+
+function decodedForInspection(value: string): string | null {
+  let decoded = value;
+  try {
+    for (let depth = 0; depth < 4; depth += 1) {
+      const next = decodeURIComponent(decoded);
+      if (next === decoded) break;
+      decoded = next;
+    }
+  } catch {
+    return null;
+  }
+  return decoded;
+}
+
+function sensitiveQueryKey(value: string): boolean {
+  const canonical = value.toLowerCase().replace(/[^a-z0-9]/g, "");
+  return SENSITIVE_QUERY_KEYS.has(canonical) ||
+    /(?:token|secret|password|passwd|passphrase|credential|credentials)$/.test(canonical);
+}
+
+function safeBrowserDeliveryUrl(value: string): boolean {
+  if (value.length > 4_096 || !value.startsWith("/") || value.startsWith("//")) return false;
+  const inspected = decodedForInspection(value);
+  if (!inspected) return false;
+  if (
+    /[\\\r\n\u0000-\u001f\u007f]/.test(inspected) ||
+    /\brtsps?\s*:/i.test(inspected) ||
+    /(?:^|\D)(?:\d{1,3}\.){3}\d{1,3}(?:\D|$)/.test(inspected) ||
+    /\[[0-9a-f:]+\]/i.test(inspected) ||
+    /(?:^|[/?#&=])[^/?#&=\s:@]+:[^/?#&\s@]+@/.test(inspected) ||
+    /\b(?:basic|bearer)\s+[a-z0-9._~+/=-]+/i.test(inspected)
+  ) return false;
+
+  const base = new URL("https://mission-core.invalid/");
+  let parsed: URL;
+  let inspectedParsed: URL;
+  try {
+    parsed = new URL(value, base);
+    inspectedParsed = new URL(inspected, base);
+  } catch {
+    return false;
+  }
+  if (
+    parsed.origin !== base.origin || inspectedParsed.origin !== base.origin ||
+    parsed.username || parsed.password || parsed.hash ||
+    inspectedParsed.username || inspectedParsed.password || inspectedParsed.hash
+  ) return false;
+  for (const [key] of inspectedParsed.searchParams) {
+    if (sensitiveQueryKey(key)) return false;
+  }
+  return true;
+}
+
+function browserDelivery(
+  value: XgridsCameraPreviewDelivery | null | undefined,
+): ObservationSourceDelivery | null {
+  const id = value?.id?.trim();
+  const url = value?.url?.trim();
+  const mediaType = value?.media_type?.trim();
+  if (!id || value?.kind !== "mse-fmp4-websocket" || !url || !mediaType) return null;
+  // Browser delivery is host-owned and same-origin. A device RTSP/IP endpoint
+  // must never cross the plugin boundary into the host descriptor catalog.
+  if (!safeBrowserDeliveryUrl(url)) return null;
+  if (!/^video\/mp4(?:\s*;|$)/i.test(mediaType)) return null;
+  return { id, kind: value.kind, url, mediaType };
+}
+
+function cameraAvailability(
+  state: XgridsK1State,
+  stream: XgridsSensorCatalogStream,
+  selected: boolean,
+  delivery: ObservationSourceDelivery | null,
+  attested: boolean,
+): ObservationSourceAvailability {
+  if (!attested) return "unverified";
   if (state.device_session?.connectivity === "degraded") return "degraded";
-  // The firmware profile proves that both RTSP channels exist, but Mission Core
-  // does not yet expose a browser-decodable preview URL. Do not report a live
-  // camera merely because the point-cloud acquisition is running.
-  return "declared";
+  const base = catalogAvailability(stream.availability);
+  if (!selected) return base === "streaming" || base === "connecting" ? "available" : base;
+
+  const phase = state.camera_preview?.phase?.trim().toLowerCase();
+  if (phase === "error" || base === "error") return "error";
+  if (delivery && (phase === "streaming" || phase === "active" || phase === "ready")) {
+    return "streaming";
+  }
+  if (phase === "degraded") return "degraded";
+  return "connecting";
 }
 
 export function xgridsK1ObservationSources(
@@ -67,9 +197,7 @@ export function xgridsK1ObservationSources(
   const clockId = binding.acquisitionId ?? binding.deviceSessionId ?? binding.deviceId ?? null;
   const descriptorId = (sourceId: string) =>
     `${provider.pluginId}:${provider.modelId}:${sourceId}`;
-
-  return [
-    {
+  const pointCloud: ObservationSourceDescriptor = {
       id: descriptorId("sensor.lidar.primary"),
       sourceId: "sensor.lidar.primary",
       semanticChannelId: "spatial.point-cloud.live",
@@ -81,6 +209,8 @@ export function xgridsK1ObservationSources(
       transport: "rerun-grpc",
       endpointLabel: state.rerun_grpc_url?.trim() ? "Rerun gRPC" : "MQTT → Rerun",
       previewUrl: state.rerun_grpc_url?.trim() || null,
+      delivery: null,
+      activation: null,
       provider,
       binding,
       capabilities: {
@@ -96,58 +226,73 @@ export function xgridsK1ObservationSources(
         clockId,
         spatialRegistration: "native",
       },
-    },
-    {
-      id: descriptorId("sensor.camera.left"),
-      sourceId: "sensor.camera.left",
-      semanticChannelId: "camera.preview.live",
-      label: "K1 · камера слева",
-      description: "Левый H.264 preview-канал профиля устройства",
+    };
+
+  const cameraRows = (state.sensor_catalog?.streams ?? []).filter(cameraCatalogEntry);
+  const sourceIdCounts = new Map<string, number>();
+  for (const stream of cameraRows) {
+    const sourceId = stream.source_id?.trim();
+    if (sourceId) sourceIdCounts.set(sourceId, (sourceIdCounts.get(sourceId) ?? 0) + 1);
+  }
+  const attested = Boolean(provider.compatibilityProfileId && binding.deviceSessionId);
+  const sessionScope = binding.deviceSessionId ?? binding.deviceId ?? "unbound";
+  const activeSourceId = state.camera_preview?.active_source_id?.trim() ?? null;
+
+  const cameras = cameraRows.flatMap<ObservationSourceDescriptor>((stream) => {
+    const sourceId = stream.source_id?.trim();
+    const semanticChannelId = stream.semantic_channel_id?.trim();
+    if (!sourceId || !semanticChannelId || sourceIdCounts.get(sourceId) !== 1) return [];
+
+    const rawActivation = stream.activation;
+    const groupId = rawActivation?.group_id?.trim();
+    const maxActive = rawActivation?.max_active;
+    const activationValid = Boolean(
+      groupId && Number.isInteger(maxActive) && (maxActive ?? 0) > 0,
+    );
+    const selected = Boolean(
+      attested && activationValid && rawActivation?.selected === true && activeSourceId === sourceId,
+    );
+    const activation = activationValid
+      ? {
+          groupId: `${provider.pluginId}:${sessionScope}:${groupId}`,
+          maxActive: maxActive as number,
+          selected,
+          controllable: Boolean(attested && rawActivation?.controllable),
+        }
+      : null;
+    const candidateDelivery = stream.delivery ?? state.camera_preview?.delivery;
+    const delivery = selected ? browserDelivery(candidateDelivery) : null;
+    const label = stream.label?.trim() || sourceId;
+
+    return [{
+      id: descriptorId(sourceId),
+      sourceId,
+      semanticChannelId,
+      label,
+      description: "Видеоканал, опубликованный активным device-плагином",
       modality: "video",
       role: "auxiliary",
-      availability: cameraAvailability(state),
-      transport: "rtsp",
-      endpointLabel: "RTSP · left",
+      availability: cameraAvailability(state, stream, selected, delivery, attested),
+      transport: delivery ? "websocket" : "other",
+      endpointLabel: safeEndpointLabel(stream.endpoint_label) ?? "Локальный video adapter",
       previewUrl: null,
+      delivery,
+      activation,
       provider,
       binding,
       capabilities: {
         overlay: true,
         fullscreen: true,
         resizable: true,
-        defaultVisible: false,
+        defaultVisible: selected && Boolean(delivery),
         timelineMode: "live-only",
         seekable: false,
         sessionRecording: false,
         clockId,
         spatialRegistration: "unresolved",
       },
-    },
-    {
-      id: descriptorId("sensor.camera.right"),
-      sourceId: "sensor.camera.right",
-      semanticChannelId: "camera.preview.live",
-      label: "K1 · камера справа",
-      description: "Правый H.264 preview-канал профиля устройства",
-      modality: "video",
-      role: "auxiliary",
-      availability: cameraAvailability(state),
-      transport: "rtsp",
-      endpointLabel: "RTSP · right",
-      previewUrl: null,
-      provider,
-      binding,
-      capabilities: {
-        overlay: true,
-        fullscreen: true,
-        resizable: true,
-        defaultVisible: false,
-        timelineMode: "live-only",
-        seekable: false,
-        sessionRecording: false,
-        clockId,
-        spatialRegistration: "unresolved",
-      },
-    },
-  ];
+    }];
+  });
+
+  return [pointCloud, ...cameras];
 }
diff --git a/apps/control-station/src/device-plugins/xgrids-k1/runtimeContext.tsx b/apps/control-station/src/device-plugins/xgrids-k1/runtimeContext.tsx
index aed17f1..1473159 100644
--- a/apps/control-station/src/device-plugins/xgrids-k1/runtimeContext.tsx
+++ b/apps/control-station/src/device-plugins/xgrids-k1/runtimeContext.tsx
@@ -130,6 +130,7 @@ export function XgridsK1RuntimeProvider({
     pendingAction: controller.pendingAction,
     refresh: controller.refresh,
     updateViewerSettings: controller.updateViewerSettings,
+    setObservationSourceActive: controller.setObservationSourceActive,
   };
 
   useEffect(() => {
diff --git a/apps/control-station/src/device-plugins/xgrids-k1/stateOrdering.ts b/apps/control-station/src/device-plugins/xgrids-k1/stateOrdering.ts
new file mode 100644
index 0000000..ed5e38f
--- /dev/null
+++ b/apps/control-station/src/device-plugins/xgrids-k1/stateOrdering.ts
@@ -0,0 +1,55 @@
+import type { XgridsCameraPreviewState, XgridsK1State } from "./api";
+
+function monotonicInteger(value: number | null | undefined): number | null {
+  return typeof value === "number" && Number.isInteger(value) && value >= 0 ? value : null;
+}
+
+function deviceSessionScope(state: XgridsK1State): string | null {
+  const sessionId = state.device_session?.device_session_id;
+  return typeof sessionId === "string" && sessionId.trim() ? sessionId : null;
+}
+
+function cameraSnapshotIsAtLeastAsNew(
+  current: XgridsCameraPreviewState,
+  incoming: XgridsCameraPreviewState,
+): boolean {
+  const currentRevision = monotonicInteger(current.revision);
+  const incomingRevision = monotonicInteger(incoming.revision);
+
+  if (currentRevision !== null || incomingRevision !== null) {
+    if (incomingRevision === null) return false;
+    if (currentRevision === null) return true;
+    if (incomingRevision !== currentRevision) return incomingRevision > currentRevision;
+  }
+
+  const currentGeneration = monotonicInteger(current.generation);
+  const incomingGeneration = monotonicInteger(incoming.generation);
+  if (currentGeneration === null) return true;
+  if (incomingGeneration === null) return false;
+  return incomingGeneration >= currentGeneration;
+}
+
+/**
+ * Select an authoritative runtime snapshot without allowing asynchronous REST,
+ * mutation, or event responses to roll camera preview state backwards.
+ *
+ * Revision is the primary ordering key. In particular, a stop snapshot with a
+ * newer revision and a null generation is valid and must replace the active
+ * generation. Generation is only a tie-breaker when revisions are equal or
+ * absent.
+ */
+export function selectMonotonicXgridsState(
+  current: XgridsK1State | null,
+  incoming: XgridsK1State,
+): XgridsK1State {
+  if (current && deviceSessionScope(current) !== deviceSessionScope(incoming)) {
+    return incoming;
+  }
+  if (!current?.camera_preview) return incoming;
+  if (!incoming.camera_preview) return current;
+  // Backend snapshots are atomic. Reject the whole stale response instead of
+  // combining camera/catalog/metrics fields captured at different moments.
+  return cameraSnapshotIsAtLeastAsNew(current.camera_preview, incoming.camera_preview)
+    ? incoming
+    : current;
+}
diff --git a/apps/control-station/src/device-plugins/xgrids-k1/useXgridsK1Runtime.ts b/apps/control-station/src/device-plugins/xgrids-k1/useXgridsK1Runtime.ts
index c87e9cc..08251e1 100644
--- a/apps/control-station/src/device-plugins/xgrids-k1/useXgridsK1Runtime.ts
+++ b/apps/control-station/src/device-plugins/xgrids-k1/useXgridsK1Runtime.ts
@@ -19,6 +19,7 @@ import {
   operationNeedsReconciliation,
 } from "./lifecycle";
 import { localizeRuntimeMessage } from "./messages";
+import { selectMonotonicXgridsState } from "./stateOrdering";
 
 export type PendingAction =
   | "scan"
@@ -27,6 +28,7 @@ export type PendingAction =
   | "replay"
   | "stop"
   | "abort"
+  | "camera"
   | "viewer";
 
 function messageFor(error: unknown): string {
@@ -65,7 +67,7 @@ export function useXgridsK1Runtime(enabled: boolean) {
   const mounted = useRef(true);
 
   const acceptState = useCallback((nextState: XgridsK1State) => {
-    setState(nextState);
+    setState((currentState) => selectMonotonicXgridsState(currentState, nextState));
     setBackendStatus("online");
   }, []);
 
@@ -219,6 +221,51 @@ export function useXgridsK1Runtime(enabled: boolean) {
     );
   }, [run, state?.acquisition]);
 
+  const setObservationSourceActive = useCallback(
+    (sourceId: string, active: boolean) =>
+      run("camera", async () => {
+        if (!state) {
+          throw new ApiError("Состояние устройства ещё не загружено.");
+        }
+        const deviceSessionId = state.device_session?.device_session_id?.trim();
+        if (!deviceSessionId) {
+          throw new ApiError("Для камеры нет активной сессии устройства.");
+        }
+        const catalogSource = state.sensor_catalog?.streams?.find(
+          (candidate) => candidate.source_id === sourceId,
+        );
+        if (!catalogSource || catalogSource.activation?.controllable !== true) {
+          throw new ApiError("Плагин не разрешает управление выбранным видеоканалом.");
+        }
+
+        if (active) {
+          if (
+            catalogSource.activation.selected &&
+            state.camera_preview?.active_source_id === sourceId &&
+            state.camera_preview?.phase !== "error" &&
+            state.camera_preview?.delivery
+          ) {
+            return state;
+          }
+          return xgridsK1Api.selectCameraPreview({
+            source_id: sourceId,
+            device_session_id: deviceSessionId,
+          });
+        }
+
+        if (state.camera_preview?.active_source_id !== sourceId) return state;
+        const generation = state.camera_preview.generation;
+        if (!Number.isInteger(generation) || (generation ?? 0) < 1) {
+          throw new ApiError("Плагин не вернул поколение активной camera-preview сессии.");
+        }
+        return xgridsK1Api.stopCameraPreview({
+          device_session_id: deviceSessionId,
+          generation: generation as number,
+        });
+      }),
+    [run, state],
+  );
+
   const updateViewerSettings = useCallback(
     (request: ViewerSettings) => run("viewer", () => xgridsK1Api.updateViewerSettings(request)),
     [run],
@@ -300,6 +347,7 @@ export function useXgridsK1Runtime(enabled: boolean) {
     startReplay,
     stop,
     abort,
+    setObservationSourceActive,
     updateViewerSettings,
   };
 }
diff --git a/apps/control-station/src/styles/observation.css b/apps/control-station/src/styles/observation.css
index 9a79dad..f73c2db 100644
--- a/apps/control-station/src/styles/observation.css
+++ b/apps/control-station/src/styles/observation.css
@@ -191,6 +191,59 @@ i[data-availability="error"] {
   background: #050608;
 }
 
+.mse-fmp4-player {
+  position: relative;
+  width: 100%;
+  height: 100%;
+  min-height: 9rem;
+  overflow: hidden;
+  background: #050608;
+}
+
+.mse-fmp4-player__status {
+  position: absolute;
+  inset: 0;
+  display: grid;
+  place-items: center;
+  align-content: center;
+  gap: 0.5rem;
+  padding: 1rem;
+  background: rgb(5 6 8 / 0.88);
+  color: var(--nodedc-text-muted);
+  text-align: center;
+}
+
+.mse-fmp4-player__status strong {
+  color: var(--nodedc-text-secondary);
+  font-size: 0.7rem;
+}
+
+.mse-fmp4-player__status span {
+  max-width: 24rem;
+  font-size: 0.59rem;
+  line-height: 1.45;
+}
+
+.mse-fmp4-player__status button {
+  display: inline-flex;
+  align-items: center;
+  gap: 0.4rem;
+  margin-top: 0.25rem;
+  border: 1px solid rgb(255 255 255 / 0.12);
+  border-radius: 999px;
+  background: rgb(255 255 255 / 0.06);
+  color: var(--nodedc-text-primary);
+  padding: 0.48rem 0.72rem;
+  font: inherit;
+  font-size: 0.58rem;
+  font-weight: 760;
+  cursor: pointer;
+}
+
+.mse-fmp4-player__status button:hover {
+  background: rgb(255 255 255 / 0.11);
+}
+
 .observation-media__empty {
   min-height: 9rem;
   background: #07080a;
@@ -220,6 +273,24 @@ i[data-availability="error"] {
   color: var(--nodedc-text-primary);
 }
 
+.camera-slot__head-actions .camera-slot__activation {
+  width: auto;
+  min-width: 5.6rem;
+  height: 1.9rem;
+  border: 1px solid rgb(255 255 255 / 0.09);
+  border-radius: 999px;
+  padding: 0 0.65rem;
+  font: inherit;
+  font-size: 0.53rem;
+  font-weight: 760;
+  white-space: nowrap;
+}
+
+.camera-slot__head-actions .camera-slot__activation:disabled {
+  cursor: wait;
+  opacity: 0.48;
+}
+
 .floating-observation-window__status {
   color: var(--nodedc-text-secondary);
   font-size: 0.54rem;
diff --git a/apps/control-station/src/styles/spatial.css b/apps/control-station/src/styles/spatial.css
index 7c7d3b8..1e204ae 100644
--- a/apps/control-station/src/styles/spatial.css
+++ b/apps/control-station/src/styles/spatial.css
@@ -90,6 +90,24 @@
   background: rgb(10 11 14 / 0.9);
 }
 
+.rerun-viewport__retry {
+  margin-top: 0.65rem;
+  border: 1px solid var(--station-hairline-strong);
+  border-radius: 999px;
+  background: rgb(255 255 255 / 0.08);
+  padding: 0.42rem 0.7rem;
+  color: var(--nodedc-text-primary);
+  font: inherit;
+  font-size: 0.61rem;
+  cursor: pointer;
+}
+
+.rerun-viewport__retry:hover,
+.rerun-viewport__retry:focus-visible {
+  background: rgb(255 255 255 / 0.14);
+  outline: none;
+}
+
 .busy-indicator {
   width: 1rem;
   height: 1rem;
diff --git a/apps/control-station/src/workspaces/Workspaces.tsx b/apps/control-station/src/workspaces/Workspaces.tsx
index 8caeea5..4a7d62b 100644
--- a/apps/control-station/src/workspaces/Workspaces.tsx
+++ b/apps/control-station/src/workspaces/Workspaces.tsx
@@ -328,6 +328,7 @@ function SpatialWorkspace({
         {sourceUrl.trim() && pointCloudVisible ? (
           <RerunViewport
             sourceUrl={sourceUrl}
+            followLive={state?.sourceMode === "live"}
             onStatusChange={onStatusChange}
             onSelectionChange={onSelectionChange}
           />
@@ -349,6 +350,7 @@ function SpatialWorkspace({
             <ObservationSourcePicker
               sources={observationSources}
               visibleSourceIds={observationLayout.visibleSourceIds}
+              pendingSourceIds={observationLayout.pendingSourceIds}
               onToggle={observationLayout.toggleSource}
             />
             {pointCloudSource?.capabilities.fullscreen && pointCloudVisible && sourceUrl.trim() ? (
@@ -434,7 +436,7 @@ function SpatialWorkspace({
             onMaximizedChange={(maximized) =>
               observationLayout.setFloatingMaximized(source.id, maximized)}
             onActivate={() => observationLayout.activateFloatingSource(source.id)}
-            onClose={() => observationLayout.hideSource(source.id)}
+            onClose={() => void observationLayout.hideSource(source.id)}
           />
         )) : null}
       </div>
@@ -454,12 +456,41 @@ function SpatialWorkspace({
 function CameraSourceCard({
   source,
   focused,
+  visible,
+  pending,
+  selectedPeer,
+  onToggle,
   onFocus,
 }: {
   source: ObservationSourceDescriptor;
   focused: boolean;
+  visible: boolean;
+  pending: boolean;
+  selectedPeer: boolean;
+  onToggle: () => void;
   onFocus: () => void;
 }) {
+  const deliveryActive = Boolean(
+    (source.delivery || source.previewUrl) &&
+    (!source.activation || source.activation.selected),
+  );
+  const restartAvailable = Boolean(
+    source.activation?.selected &&
+    source.activation.controllable &&
+    (source.availability === "error" || !source.delivery),
+  );
+  const activationLabel = pending
+    ? "Переключение…"
+    : restartAvailable
+      ? "Повторить подключение"
+      : source.activation?.selected && visible
+      ? "Закрыть канал"
+      : source.activation?.selected
+        ? "Показать канал"
+        : selectedPeer
+          ? "Переключить"
+          : "Открыть канал";
+
   return (
     <article className="camera-slot" data-focused={focused ? "true" : undefined}>
       <header>
@@ -469,7 +500,17 @@ function CameraSourceCard({
             <i data-availability={source.availability} aria-hidden="true" />
             {observationSourceStatusLabel(source)}
           </span>
-          {source.capabilities.fullscreen ? (
+          {source.activation ? (
+            <button
+              type="button"
+              className="camera-slot__activation"
+              disabled={pending || (!source.activation.selected && !source.activation.controllable)}
+              onClick={onToggle}
+            >
+              {activationLabel}
+            </button>
+          ) : null}
+          {source.capabilities.fullscreen && deliveryActive ? (
             <button
               type="button"
               aria-label={focused ? `Свернуть ${source.label}` : `Развернуть ${source.label}`}
@@ -510,6 +551,15 @@ function CamerasWorkspace({ definition, state, observationLayout }: WorkspaceRen
             key={source.id}
             source={source}
             focused={focusedSource?.id === source.id}
+            visible={observationLayout.visibleSourceIds.has(source.id)}
+            pending={observationLayout.pendingSourceIds.has(source.id)}
+            selectedPeer={Boolean(
+              source.activation && sources.some((candidate) =>
+                candidate.id !== source.id &&
+                candidate.activation?.groupId === source.activation?.groupId &&
+                candidate.activation?.selected === true),
+            )}
+            onToggle={() => void observationLayout.toggleSource(source.id)}
             onFocus={() => observationLayout.setFocusedSourceId(
               focusedSource?.id === source.id ? null : source.id,
             )}
@@ -523,8 +573,11 @@ function CamerasWorkspace({ definition, state, observationLayout }: WorkspaceRen
         )}
       </div>
       <ObservationTimeline
-        active={sources.some((source) => source.availability === "streaming")}
-        sourceCount={sources.length}
+        active={sources.some((source) =>
+          source.availability === "streaming" &&
+          (!source.activation || source.activation.selected))}
+        sourceCount={sources.filter((source) =>
+          !source.activation || source.activation.selected).length}
         mode={timeline?.mode}
         seekable={timeline?.seekable}
         synchronization={timeline?.synchronization}
diff --git a/apps/control-station/test/observationSources.test.mjs b/apps/control-station/test/observationSources.test.mjs
index 6c5fcfe..5e9a502 100644
--- a/apps/control-station/test/observationSources.test.mjs
+++ b/apps/control-station/test/observationSources.test.mjs
@@ -6,6 +6,10 @@ import { createServer } from "vite";
 let server;
 let xgridsK1Manifest;
 let xgridsK1ObservationSources;
+let openObservationSource;
+let shouldRestartObservationSource;
+let consumeCameraLeaseRetry;
+let resetCameraLeaseRetryBudget;
 
 before(async () => {
   server = await createServer({
@@ -19,6 +23,12 @@ before(async () => {
   ({ xgridsK1ObservationSources } = await server.ssrLoadModule(
     "/src/device-plugins/xgrids-k1/observationSources.ts",
   ));
+  ({ openObservationSource, shouldRestartObservationSource } = await server.ssrLoadModule(
+    "/src/core/observation/layoutPolicy.ts",
+  ));
+  ({ consumeCameraLeaseRetry, resetCameraLeaseRetryBudget } = await server.ssrLoadModule(
+    "/src/components/MseFmp4WebSocketPlayer.tsx",
+  ));
 });
 
 after(async () => {
@@ -31,7 +41,30 @@ function model() {
   return activeModel;
 }
 
-function declaredState() {
+function cameraRow(sourceId, label) {
+  return {
+    stream_id: `camera.preview.${sourceId.split(".").at(-1)}`,
+    source_id: sourceId,
+    semantic_channel_id: "camera.preview.live",
+    label,
+    sensor_kind: "camera",
+    modality: "encoded-video",
+    availability: "available",
+    endpoint_label: "MSE · fMP4",
+    activation: {
+      group_id: "camera.preview.decoder",
+      max_active: 1,
+      selected: false,
+      controllable: true,
+    },
+    delivery: null,
+  };
+}
+
+function declaredState(cameraRows = [
+  cameraRow("sensor.camera.left", "K1 · камера слева"),
+  cameraRow("sensor.camera.right", "K1 · камера справа"),
+]) {
   const activeModel = model();
   return {
     phase: "connected",
@@ -60,13 +93,20 @@ function declaredState() {
       revision: "test-profile",
       streams: [
         { stream_id: "spatial.point-cloud.live", modality: "point-cloud", availability: "observed" },
-        { stream_id: "camera.preview.live", modality: "encoded-video", availability: "observed" },
+        ...cameraRows,
       ],
     },
+    camera_preview: {
+      phase: "idle",
+      revision: 1,
+      generation: 0,
+      active_source_id: null,
+      delivery: null,
+    },
   };
 }
 
-function streamingState() {
+function pointCloudStreamingState() {
   return {
     ...declaredState(),
     phase: "streaming",
@@ -88,6 +128,36 @@ function streamingState() {
   };
 }
 
+function cameraStreamingState(sourceId) {
+  const state = pointCloudStreamingState();
+  const delivery = {
+    id: `preview-generation-7:${sourceId}`,
+    kind: "mse-fmp4-websocket",
+    url: "/api/v1/device-plugins/xgrids-k1/camera-preview/ws?generation=7",
+    media_type: 'video/mp4; codecs="avc1.640028"',
+  };
+  state.sensor_catalog = {
+    ...state.sensor_catalog,
+    streams: state.sensor_catalog.streams.map((stream) =>
+      stream.source_id === sourceId
+        ? {
+            ...stream,
+            availability: "streaming",
+            activation: { ...stream.activation, selected: true },
+            delivery,
+          }
+        : stream),
+  };
+  state.camera_preview = {
+    phase: "streaming",
+    revision: 4,
+    generation: 7,
+    active_source_id: sourceId,
+    delivery,
+  };
+  return state;
+}
+
 function collectUrlLikeStrings(value, found = []) {
   if (typeof value === "string") {
     if (value.includes("://")) found.push(value);
@@ -103,95 +173,199 @@ function collectUrlLikeStrings(value, found = []) {
   return found;
 }
 
-test("K1 maps to one primary point cloud and two auxiliary camera channels", () => {
-  const sources = xgridsK1ObservationSources(declaredState(), model());
-
-  assert.equal(sources.length, 3);
-  assert.deepEqual(
-    sources.map(({ sourceId, semanticChannelId, modality, role }) => ({
-      sourceId,
-      semanticChannelId,
-      modality,
-      role,
-    })),
-    [
-      {
-        sourceId: "sensor.lidar.primary",
-        semanticChannelId: "spatial.point-cloud.live",
-        modality: "point-cloud",
-        role: "primary",
-      },
-      {
-        sourceId: "sensor.camera.left",
-        semanticChannelId: "camera.preview.live",
-        modality: "video",
-        role: "auxiliary",
-      },
-      {
-        sourceId: "sensor.camera.right",
-        semanticChannelId: "camera.preview.live",
-        modality: "video",
-        role: "auxiliary",
-      },
-    ],
+test("K1 maps zero, one or N catalog cameras without model-specific source ids", () => {
+  const zero = xgridsK1ObservationSources(declaredState([]), model());
+  const one = xgridsK1ObservationSources(
+    declaredState([cameraRow("rig.front", "Передняя камера")]),
+    model(),
   );
+  const many = xgridsK1ObservationSources(declaredState(), model());
 
-  assert.equal(new Set(sources.map(({ id }) => id)).size, sources.length);
-  assert.ok(sources.every(({ provider }) => provider.pluginId && provider.modelId));
-  assert.ok(sources.every(({ provider }) => provider.pluginVersion));
-  assert.ok(sources.every(({ binding }) => binding.deviceId === "device-k1-001"));
-  assert.ok(sources.every(({ capabilities }) => capabilities.timelineMode === "live-only"));
+  assert.deepEqual(zero.map(({ modality }) => modality), ["point-cloud"]);
+  assert.deepEqual(one.map(({ sourceId }) => sourceId), ["sensor.lidar.primary", "rig.front"]);
+  assert.deepEqual(many.map(({ sourceId }) => sourceId), [
+    "sensor.lidar.primary",
+    "sensor.camera.left",
+    "sensor.camera.right",
+  ]);
+  assert.equal(new Set(many.map(({ id }) => id)).size, many.length);
+  assert.ok(many.every(({ provider }) => provider.pluginId && provider.modelId));
+  assert.ok(many.every(({ binding }) => binding.deviceId === "device-k1-001"));
 });
 
-test("observation source ids remain stable while runtime availability changes", () => {
+test("descriptor ids remain stable while point cloud and selected camera start streaming", () => {
   const declared = xgridsK1ObservationSources(declaredState(), model());
-  const streaming = xgridsK1ObservationSources(streamingState(), model());
-
-  assert.deepEqual(
-    streaming.map(({ id }) => id),
-    declared.map(({ id }) => id),
+  const streaming = xgridsK1ObservationSources(
+    cameraStreamingState("sensor.camera.left"),
+    model(),
   );
+
+  assert.deepEqual(streaming.map(({ id }) => id), declared.map(({ id }) => id));
   assert.equal(declared[0].availability, "available");
   assert.equal(streaming[0].availability, "streaming");
   assert.equal(streaming[0].previewUrl, "rerun+http://127.0.0.1:9877/proxy");
 });
 
-test("camera descriptors stay declared and URL-free until a browser delivery adapter exists", () => {
-  const sources = xgridsK1ObservationSources(streamingState(), model());
+test("only the authoritative selected camera receives browser delivery", () => {
+  const sources = xgridsK1ObservationSources(
+    cameraStreamingState("sensor.camera.left"),
+    model(),
+  );
   const cameras = sources.filter(({ modality }) => modality === "video");
+  const [left, right] = cameras;
 
   assert.equal(cameras.length, 2);
-  for (const camera of cameras) {
-    assert.equal(camera.availability, "declared");
-    assert.equal(camera.transport, "rtsp");
-    assert.equal(camera.previewUrl, null);
-    assert.equal(camera.capabilities.spatialRegistration, "unresolved");
-    assert.equal(camera.capabilities.resizable, true);
-    assert.doesNotMatch(camera.endpointLabel ?? "", /:\/\//);
-  }
+  assert.equal(left.activation.selected, true);
+  assert.equal(left.activation.maxActive, 1);
+  assert.equal(left.availability, "streaming");
+  assert.equal(left.delivery.kind, "mse-fmp4-websocket");
+  assert.equal(left.transport, "websocket");
+  assert.equal(right.activation.selected, false);
+  assert.equal(right.availability, "available");
+  assert.equal(right.delivery, null);
+  assert.equal(left.activation.groupId, right.activation.groupId);
+  assert.match(left.activation.groupId, /device-session-001/);
+});
 
+test("switching left to right keeps ids stable and never exposes both deliveries", () => {
+  const left = xgridsK1ObservationSources(
+    cameraStreamingState("sensor.camera.left"),
+    model(),
+  ).filter(({ modality }) => modality === "video");
+  const right = xgridsK1ObservationSources(
+    cameraStreamingState("sensor.camera.right"),
+    model(),
+  ).filter(({ modality }) => modality === "video");
+
+  assert.deepEqual(right.map(({ id }) => id), left.map(({ id }) => id));
+  assert.deepEqual(left.filter(({ delivery }) => delivery).map(({ sourceId }) => sourceId), [
+    "sensor.camera.left",
+  ]);
+  assert.deepEqual(right.filter(({ delivery }) => delivery).map(({ sourceId }) => sourceId), [
+    "sensor.camera.right",
+  ]);
+});
+
+test("camera descriptors never leak vendor RTSP endpoints or device IP addresses", () => {
+  const sources = xgridsK1ObservationSources(
+    cameraStreamingState("sensor.camera.left"),
+    model(),
+  );
+  const cameras = sources.filter(({ modality }) => modality === "video");
+
+  assert.ok(cameras.every(({ previewUrl }) => previewUrl === null));
   assert.deepEqual(collectUrlLikeStrings(sources), [
     "rerun+http://127.0.0.1:9877/proxy",
   ]);
-  const serialized = JSON.stringify(sources);
+  const serialized = JSON.stringify(cameras);
   assert.doesNotMatch(serialized, /rtsp:\/\//i);
   assert.doesNotMatch(serialized, /192\.168\.7\.10/);
   assert.doesNotMatch(serialized, /vendor-(?:preview|viewer)/);
 });
 
-test("unattested camera catalog entries remain unverified", () => {
-  const state = declaredState();
+test("unattested, duplicate and unsafe camera entries fail closed", () => {
+  const duplicate = cameraRow("sensor.camera.left", "Duplicate");
+  const state = cameraStreamingState("sensor.camera.left");
   state.compatibility.profile_id = null;
   state.device_session.compatibility_profile_id = null;
-  state.sensor_catalog.streams = state.sensor_catalog.streams.map((stream) =>
-    stream.stream_id === "camera.preview.live"
-      ? { ...stream, availability: "unverified", decode_status: "profile-not-attested" }
-      : stream);
+  state.sensor_catalog.streams.push(duplicate);
+  state.camera_preview.delivery = {
+    ...state.camera_preview.delivery,
+    url: "ws://192.168.7.10:9000/leak",
+  };
 
   const cameras = xgridsK1ObservationSources(state, model()).filter(
     ({ modality }) => modality === "video",
   );
-  assert.equal(cameras.length, 2);
-  assert.ok(cameras.every(({ availability }) => availability === "unverified"));
-  assert.ok(cameras.every(({ previewUrl }) => previewUrl === null));
+  assert.deepEqual(cameras.map(({ sourceId }) => sourceId), ["sensor.camera.right"]);
+  assert.equal(cameras[0].availability, "unverified");
+  assert.equal(cameras[0].activation.controllable, false);
+  assert.equal(cameras[0].delivery, null);
+});
+
+test("camera delivery rejects literal and encoded endpoint or credential leaks", () => {
+  const unsafeUrls = [
+    "/api/preview?upstream=rtsp://camera.local/live",
+    "/api/preview?upstream=rtsp%3A%2F%2Fcamera.local%2Flive",
+    "/api/preview?upstream=rtsp%253A%252F%252Fcamera.local%252Flive",
+    "/api/preview?endpoint=192.168.68.52:8554",
+    "/api/preview?endpoint=192%2E168%2E68%2E52",
+    "/api/preview?password=not-for-the-browser",
+    "/api/preview?%70%61%73%73%77%6f%72%64=not-for-the-browser",
+    "/api/preview/camera:secret@device",
+    "/%2f%2fevil.example/preview",
+  ];
+
+  for (const url of unsafeUrls) {
+    const state = cameraStreamingState("sensor.camera.left");
+    state.camera_preview.delivery = { ...state.camera_preview.delivery, url };
+    state.sensor_catalog.streams = state.sensor_catalog.streams.map((stream) =>
+      stream.source_id === "sensor.camera.left"
+        ? { ...stream, delivery: { ...stream.delivery, url } }
+        : stream,
+    );
+    const left = xgridsK1ObservationSources(state, model()).find(
+      ({ sourceId }) => sourceId === "sensor.camera.left",
+    );
+    assert.ok(left, `left camera descriptor missing for ${url}`);
+    assert.equal(left.delivery, null, `unsafe delivery escaped for ${url}`);
+  }
+});
+
+test("manual camera reconnect restores an exhausted lease retry budget", () => {
+  let budget = resetCameraLeaseRetryBudget("delivery-7");
+  for (const expectedDelay of [400, 1_000, 2_000]) {
+    const retry = consumeCameraLeaseRetry(budget, "delivery-7");
+    assert.equal(retry.delay, expectedDelay);
+    budget = retry.budget;
+  }
+  assert.equal(consumeCameraLeaseRetry(budget, "delivery-7").delay, null);
+
+  budget = resetCameraLeaseRetryBudget("delivery-7");
+  const retryAfterManualReset = consumeCameraLeaseRetry(budget, "delivery-7");
+  assert.equal(retryAfterManualReset.delay, 400);
+  assert.equal(retryAfterManualReset.budget.count, 1);
+});
+
+test("layout policy evicts only exclusive camera peers", () => {
+  const sources = xgridsK1ObservationSources(
+    cameraStreamingState("sensor.camera.left"),
+    model(),
+  );
+  const left = sources.find(({ sourceId }) => sourceId === "sensor.camera.left");
+  const right = sources.find(({ sourceId }) => sourceId === "sensor.camera.right");
+  const pointCloud = sources.find(({ modality }) => modality === "point-cloud");
+  assert.ok(left && right && pointCloud);
+
+  const change = openObservationSource(
+    [pointCloud.id, left.id],
+    right.id,
+    sources,
+  );
+  assert.deepEqual(change.visibleIds, [pointCloud.id, right.id]);
+  assert.deepEqual(change.removedIds, [left.id]);
+});
+
+test("selected camera without delivery is explicitly restartable", () => {
+  const state = cameraStreamingState("sensor.camera.left");
+  state.camera_preview = {
+    ...state.camera_preview,
+    phase: "error",
+    delivery: null,
+  };
+  state.sensor_catalog.streams = state.sensor_catalog.streams.map((stream) =>
+    stream.source_id === "sensor.camera.left"
+      ? { ...stream, availability: "error", delivery: null }
+      : stream,
+  );
+  const sources = xgridsK1ObservationSources(state, model());
+  const left = sources.find(({ sourceId }) => sourceId === "sensor.camera.left");
+  const right = sources.find(({ sourceId }) => sourceId === "sensor.camera.right");
+  assert.ok(left && right);
+
+  assert.equal(left.activation.selected, true);
+  assert.equal(left.delivery, null);
+  assert.equal(left.availability, "error");
+  assert.equal(shouldRestartObservationSource(left), true);
+  assert.equal(shouldRestartObservationSource(right), false);
 });
diff --git a/apps/control-station/test/runtimeStateOrdering.test.mjs b/apps/control-station/test/runtimeStateOrdering.test.mjs
new file mode 100644
index 0000000..2306dcf
--- /dev/null
+++ b/apps/control-station/test/runtimeStateOrdering.test.mjs
@@ -0,0 +1,111 @@
+import assert from "node:assert/strict";
+import { after, before, test } from "node:test";
+
+import { createServer } from "vite";
+
+let server;
+let selectMonotonicXgridsState;
+
+before(async () => {
+  server = await createServer({
+    appType: "custom",
+    logLevel: "silent",
+    server: { middlewareMode: true },
+  });
+  ({ selectMonotonicXgridsState } = await server.ssrLoadModule(
+    "/src/device-plugins/xgrids-k1/stateOrdering.ts",
+  ));
+});
+
+after(async () => {
+  await server?.close();
+});
+
+function snapshot(revision, generation, phase = "streaming", sessionId = "device-session-a") {
+  return {
+    phase: "connected",
+    message: `${phase}:${revision}:${generation}`,
+    device_session: sessionId === null
+      ? null
+      : {
+          device_session_id: sessionId,
+          device_id: `device-for-${sessionId}`,
+          connectivity: "connected",
+        },
+    camera_preview: {
+      phase,
+      revision,
+      generation,
+      active_source_id: generation === null ? null : "sensor.camera.left",
+      delivery: null,
+    },
+  };
+}
+
+test("accepts the first camera preview snapshot", () => {
+  const incoming = snapshot(1, 1);
+  assert.equal(selectMonotonicXgridsState(null, incoming), incoming);
+});
+
+test("rejects a lower revision even when its generation is higher", () => {
+  const current = snapshot(8, 3);
+  const stale = snapshot(7, 99);
+  assert.equal(selectMonotonicXgridsState(current, stale), current);
+});
+
+test("uses generation only as a tie-breaker for equal revisions", () => {
+  const current = snapshot(8, 3);
+  const stale = snapshot(8, 2);
+  const equal = snapshot(8, 3, "selected");
+
+  assert.equal(selectMonotonicXgridsState(current, stale), current);
+  assert.equal(selectMonotonicXgridsState(current, equal), equal);
+});
+
+test("accepts a newer stop revision with a null generation", () => {
+  const current = snapshot(8, 3);
+  const stopped = snapshot(9, null, "idle");
+
+  assert.equal(selectMonotonicXgridsState(current, stopped), stopped);
+});
+
+test("rejects an unversioned camera snapshot after a versioned one", () => {
+  const current = snapshot(8, 3);
+  const stale = {
+    phase: "connected",
+    device_session: current.device_session,
+  };
+
+  assert.equal(selectMonotonicXgridsState(current, stale), current);
+});
+
+test("accepts revision reset when the authoritative device session changes", () => {
+  const current = snapshot(18, 7, "streaming", "device-session-a");
+  const nextDevice = snapshot(0, null, "idle", "device-session-b");
+
+  assert.equal(selectMonotonicXgridsState(current, nextDevice), nextDevice);
+});
+
+test("accepts backend reset that clears and later recreates the device session", () => {
+  const current = snapshot(18, 7, "streaming", "device-session-a");
+  const reset = snapshot(0, null, "idle", null);
+  const reconnected = snapshot(0, null, "idle", "device-session-c");
+
+  assert.equal(selectMonotonicXgridsState(current, reset), reset);
+  assert.equal(selectMonotonicXgridsState(reset, reconnected), reconnected);
+});
+
+test("rejects the entire stale atomic snapshot instead of merging unrelated fields", () => {
+  const current = {
+    ...snapshot(8, 3),
+    metrics: { point_count: 2_500 },
+  };
+  const stale = {
+    ...snapshot(7, 2),
+    metrics: { point_count: 9_999 },
+  };
+
+  const accepted = selectMonotonicXgridsState(current, stale);
+  assert.equal(accepted, current);
+  assert.equal(accepted.metrics.point_count, 2_500);
+});
diff --git a/apps/control-station/vite.config.ts b/apps/control-station/vite.config.ts
index ba7a1ad..f79c0db 100644
--- a/apps/control-station/vite.config.ts
+++ b/apps/control-station/vite.config.ts
@@ -8,6 +8,12 @@ export default defineConfig(({ mode }) => {
 
   return {
     plugins: [react(), wasm()],
+    optimizeDeps: {
+      // Rerun resolves its WASM asset relative to the package entrypoint. Vite's
+      // dependency pre-bundler flattens that entrypoint and leaves the WASM URL
+      // pointing at the SPA fallback, which browsers reject as text/html.
+      exclude: ["@rerun-io/web-viewer"],
+    },
     build: {
       target: "esnext",
     },
diff --git a/docs/07_MISSION_CORE_MONOREPO.md b/docs/07_MISSION_CORE_MONOREPO.md
index 22880d7..2bea885 100644
--- a/docs/07_MISSION_CORE_MONOREPO.md
+++ b/docs/07_MISSION_CORE_MONOREPO.md
@@ -101,10 +101,20 @@ receiver and operator workflow only. K1 scanning is still started and stopped
 by physical double-click; no modeling request is published.
 
 Left/right camera preview transport, endpoint paths and H.264 framing are now
-observed under the exact compatibility profile. The read-only runtime adapter is
-not implemented yet. Device status and heartbeat remain raw observed channels
-without semantic decoders. Device calibration command and sensor-to-vehicle
-extrinsics are unavailable.
+observed under the exact compatibility profile. The local read-only adapter
+copy-remuxes one selected RTSP producer into bounded fMP4/WebSocket delivery for
+the generic MSE UI. Portable FFmpeg packaging, fan-out and remote delivery remain
+open. Device status and heartbeat remain raw observed channels without semantic
+decoders. Device calibration command and sensor-to-vehicle extrinsics are
+unavailable.
+
+The 2026-07-17 physical acceptance gate confirmed continuously updating point
+clouds, a matching live trajectory, and both camera selections in the same
+Mission Core acquisition. The embedded Rerun blueprint owns live-edge following
+on `stream_time`; the React shell selects the timeline once and does not drive it
+with a timer. Raw captures, camera frames, device identity and network details
+remain outside Git. See [`ADR 0007`](adr/0007-k1-camera-preview-copy-remux-gateway.md)
+for the measured gate and remaining limits.
 
 ## Remaining extraction order
 
@@ -118,7 +128,8 @@ extrinsics are unavailable.
 5. Replace compatibility routes and singleton state with multi-device session
    routing.
 6. Split Edge execution from the Control Station behind authenticated transport.
-7. Implement the now-observed read-only RTSP/H.264 camera adapter; keep the
+7. Package the read-only RTSP/H.264 camera adapter for each target OS and evolve
+   same-host MSE delivery toward an authenticated Edge media plane; keep the
    modeling-command publisher disabled until its separate safety gate closes.
 
 ## Invariants
@@ -149,7 +160,8 @@ extrinsics are unavailable.
 - complete SDK-envelope/EvidenceStore hot-path integration;
 - remote Edge split, authenticated WAN relay and fleet orchestration;
 - automatic K1 start/stop/calibration commands;
-- camera discovery, decoding, synchronization and visualization.
+- automatic camera capability discovery, synchronized recording/rewind,
+  calibration, panoramic stitching and multi-consumer delivery.
 
 ## Workspace-repeatable locked architecture gate
 
diff --git a/docs/adr/0006-vendor-neutral-observation-sources-and-live-only-timeline.md b/docs/adr/0006-vendor-neutral-observation-sources-and-live-only-timeline.md
index 5eace81..adb0d04 100644
--- a/docs/adr/0006-vendor-neutral-observation-sources-and-live-only-timeline.md
+++ b/docs/adr/0006-vendor-neutral-observation-sources-and-live-only-timeline.md
@@ -7,9 +7,9 @@ Status: accepted for the experimental Mission Core runtime, 2026-07-16.
 The spatial scene and camera workspace must accept one device, a custom rig or a
 future multi-sensor vehicle without adding vendor-specific branches to the host
 UI. The currently verified K1 profile exposes one spatial visualization path and
-two independent H.264 camera preview producers. The browser does not yet have a
-camera delivery adapter, a shared point-cloud/video clock or confirmed camera
-intrinsics/extrinsics.
+two path-labelled H.264 camera preview producers. The direct physical gate showed
+that only one K1 preview producer can deliver frames at a time. A shared
+point-cloud/video clock and camera intrinsics/extrinsics remain unavailable.
 
 Hard-coded camera slots, direct RTSP URLs in React components and an apparently
 seekable timeline would therefore create three false contracts: a fixed sensor
@@ -27,12 +27,15 @@ count, browser ownership of device transport and replay that does not exist.
    acquisition may change layout context without changing the logical producer.
 4. The host owns visibility, z-order, position, resize and fullscreen. A plugin
    cannot inject global layout behavior.
-5. Direct device RTSP URLs do not cross into the generic UI. A future read-only
-   camera adapter must publish a browser-decodable local delivery URL.
-6. Until a bounded buffer and clock mapping exist, the shared timeline is
+5. Direct device RTSP URLs do not cross into the generic UI. The read-only K1
+   adapter publishes an opaque, same-origin fMP4/WebSocket delivery lease.
+6. A descriptor may declare a generic activation group, capacity and selection
+   state. The K1 camera producers share one group with `maxActive=1`; frontend
+   layout enforces it for UX and the plugin remains the backend authority.
+7. Until a bounded buffer and clock mapping exist, the shared timeline is
    `live-only`, `seekable=false`, `sessionRecording=false` and explicitly marked
    `host-arrival-best-effort`.
-7. Directional 3D camera frustums are not rendered until calibration and
+8. Directional 3D camera frustums are not rendered until calibration and
    extrinsics are available and verified. An unresolved camera may be listed as
    a source, but its orientation must not be invented.
 
@@ -45,8 +48,9 @@ count, browser ownership of device transport and replay that does not exist.
 | `sensor.camera.right` | `camera.preview.live` | auxiliary media window / camera card |
 
 Both camera producers share the proven canonical channel and remain distinct by
-`sourceId`. Their current state is `declared`: the compatibility profile proves
-the channels, but no browser preview URL is advertised yet.
+`sourceId`. The plugin publishes both catalog rows dynamically, but delivery is
+present only on the selected producer. Selecting the peer tears down the old
+RTSP/FFmpeg generation before a new browser lease is issued.
 
 ## UI consequences
 
@@ -62,11 +66,12 @@ the channels, but no browser preview URL is advertised yet.
 
 ## Follow-up gate
 
-The next implementation step is a plugin-owned, read-only H.264 adapter that
-terminates RTSP/RTP locally and exposes a browser-supported stream plus measured
-per-source metrics. Synchronized rewind becomes eligible only after the adapter
-provides bounded buffering and an evidenced mapping between the RTP 90 kHz clock
-and the spatial stream clock.
+The local laboratory adapter now terminates RTSP/RTP with FFmpeg, copy-remuxes
+H.264 High L4 without transcoding and publishes complete bounded fMP4 segments
+to a generic MSE player. Portable FFmpeg packaging, multi-consumer fan-out and
+remote/WAN delivery are not claimed by this milestone. Synchronized rewind
+becomes eligible only after persisted buffering and an evidenced mapping between
+the RTP 90 kHz clock and the spatial stream clock. See ADR 0007.
 
 ## Code anchors
 
@@ -76,3 +81,4 @@ and the spatial stream clock.
 - `apps/control-station/src/components/ObservationTimeline.tsx`
 - `apps/control-station/src/workspaces/Workspaces.tsx`
 - `apps/control-station/src/device-plugins/xgrids-k1/observationSources.ts`
+- `src/k1link/web/xgrids_k1_camera.py`
diff --git a/docs/adr/0007-k1-camera-preview-copy-remux-gateway.md b/docs/adr/0007-k1-camera-preview-copy-remux-gateway.md
new file mode 100644
index 0000000..206ca73
--- /dev/null
+++ b/docs/adr/0007-k1-camera-preview-copy-remux-gateway.md
@@ -0,0 +1,88 @@
+# ADR 0007: K1 camera preview copy-remux gateway
+
+Status: accepted for the local laboratory runtime, 2026-07-16.
+
+## Context
+
+The exact K1 firmware 3.0.2 profile exposes two RTSP/TCP H.264 preview paths.
+Traffic evidence and the direct physical gate establish High Profile Level 4.0,
+800x600, approximately 10 fps, about 6.5 Mbit/s and a one-second GOP. The device
+delivers frames to only one preview consumer/path at a time. Browsers cannot read
+RTSP directly and device addresses must not enter generic UI contracts.
+
+The product target will eventually require portable Edge packaging and remote
+delivery. This milestone only needs a low-latency, same-Mac laboratory path that
+does not bake XGRIDS knowledge into the host UI.
+
+## Decision
+
+1. The XGRIDS plugin owns the RTSP session and accepts only the two reviewed
+   `source_id` values. The browser never supplies a host, port, path or RTSP URL.
+2. The target is taken from the active, attested device session and validated as
+   private IPv4. Every selection has a monotonically increasing generation.
+3. Switching sources terminates the previous FFmpeg process before publishing
+   the new generation. A stale stop cannot close a newer preview.
+4. FFmpeg uses `-c:v copy`: it depacketizes the observed vendor RTP framing and
+   copy-remuxes H.264 into fragmented MP4. No video decode, image processing or
+   transcode runs in Python.
+5. A background ISO-BMFF parser publishes one `ftyp+moov` init segment followed
+   by complete `moof+mdat` media segments. Boxes and segments are bounded; the
+   server queue holds at most four segments. A slow consumer causes a clean
+   stream stop instead of unbounded latency.
+6. The generic browser renderer uses MSE with a 2 MiB pending queue and retains
+   at most about three seconds in `SourceBuffer`. It never drops an arbitrary
+   dependent fragment; overflow resets the lease.
+7. Plugin state exposes only an opaque same-origin WebSocket URL, media type,
+   generation and generic activation metadata. Device RTSP details remain inside
+   the plugin.
+
+## Verified gate
+
+The exact captured K1 codec sequence was passed in memory through the selected
+copy-remux flags and Chrome MSE. Chrome decoded High L4 at 800x600 with no media
+error and without transcoding. No camera frame fixture was persisted or added to
+Git.
+
+The final physical gate was completed on 2026-07-17 with the exact firmware
+3.0.2 profile. In one Mission Core acquisition the operator confirmed:
+
+- continuously updating point-cloud geometry in the embedded spatial scene;
+- a visible trajectory matching an approximately 3.2 by 3.35 metre physical
+  route (about 1.29 metres of vertical span in the captured poses);
+- live left and right camera selection through the generic source controls;
+- graceful operator-confirmed scanner stop, receiver finalization and media
+  process cleanup.
+
+The retained out-of-Git evidence records 11,189 point-cloud frames, 11,564 pose
+frames, 33,481,543 published points and zero decode errors. The live preview
+queue reported 2,273 bounded drops under load; this is preview backpressure,
+not loss of the raw-first evidence, and remains a performance follow-up.
+
+During the gate the scene initially appeared frozen even though counters and
+captures advanced. The cause was the embedded Rerun time cursor leaving the live
+edge. The accepted implementation now declares the `stream_time` timeline in
+native `Following` state in the backend blueprint; the frontend selects that
+timeline once when the recording opens and does not poll or force the cursor.
+
+## Deliberate limits
+
+- The current gateway allows one browser consumer because the local UI owns one
+  operator preview. Multi-tab fan-out is not claimed.
+- The Homebrew FFmpeg found on this Mac is marked `development-system`. Portable
+  releases must supply a pinned repository-local or configured binary.
+- Same-origin local WebSocket delivery is not the future WAN transport. A later
+  Edge/Control Station split should use an authenticated WebRTC/WHEP or equivalent
+  congestion-aware media plane behind the same descriptor contract.
+- Camera recording, synchronized rewind, calibration, frustums, panoramic
+  stitching and full-resolution raw imagery remain unavailable.
+- A longer physical soak test is still required to characterize sustained
+  preview backpressure and rendering cost on target Edge hardware.
+
+## Code anchors
+
+- `src/k1link/web/xgrids_k1_camera.py`
+- `src/k1link/web/xgrids_k1_facade.py`
+- `apps/control-station/src/components/MseFmp4WebSocketPlayer.tsx`
+- `apps/control-station/src/core/observation/useObservationLayout.ts`
+- `apps/control-station/src/device-plugins/xgrids-k1/observationSources.ts`
+- `tests/test_xgrids_camera_gateway.py`
diff --git a/plugins/xgrids-k1/plugin.manifest.json b/plugins/xgrids-k1/plugin.manifest.json
index a98386a..1596c66 100644
--- a/plugins/xgrids-k1/plugin.manifest.json
+++ b/plugins/xgrids-k1/plugin.manifest.json
@@ -3,7 +3,7 @@
   "kind": "DevicePlugin",
   "metadata": {
     "id": "nodedc.device.xgrids-lixelkity-k1",
-    "version": "0.2.0",
+    "version": "0.3.0",
     "displayName": "XGRIDS K1 Integration"
   },
   "spec": {
@@ -23,6 +23,8 @@
       "device.discovery.ble",
       "device.provisioning.wifi-over-ble",
       "network.mqtt.subscribe-private-lan",
+      "network.rtsp.read-private-lan",
+      "media.publish-local-browser",
       "evidence.write-session-artifacts"
     ],
     "actions": [
@@ -41,6 +43,8 @@
       { "id": "stream.start-live", "mutating": true, "secretFields": [] },
       { "id": "stream.start-replay", "mutating": true, "secretFields": [] },
       { "id": "stream.stop", "mutating": true, "secretFields": [] },
+      { "id": "camera.preview.select", "mutating": true, "secretFields": [] },
+      { "id": "camera.preview.stop", "mutating": true, "secretFields": [] },
       { "id": "viewer.settings.update", "mutating": true, "secretFields": [] }
     ],
     "models": [
@@ -56,6 +60,7 @@
           { "id": "device.provisioning.wifi-over-ble", "label": "Wi-Fi через BLE" },
           { "id": "spatial.point-cloud.live", "label": "Облако точек" },
           { "id": "spatial.pose.live", "label": "Траектория" },
+          { "id": "camera.preview.live", "label": "Видеокамеры" },
           { "id": "evidence.raw-capture", "label": "Исходная запись" },
           { "id": "evidence.replay", "label": "Повтор записи" }
         ],
diff --git a/src/k1link/viewer/rerun_bridge.py b/src/k1link/viewer/rerun_bridge.py
index eb89ff4..855f440 100644
--- a/src/k1link/viewer/rerun_bridge.py
+++ b/src/k1link/viewer/rerun_bridge.py
@@ -2,10 +2,11 @@ from __future__ import annotations
 
 import math
 import time
-from collections import deque
 from collections.abc import Callable
+from contextlib import suppress
 from dataclasses import asdict, dataclass
 from typing import Literal
+from uuid import uuid4
 
 import numpy as np
 import rerun as rr
@@ -21,7 +22,12 @@ from k1link.viewer.metrics import BridgeMetrics
 PointColorMode = Literal["intensity", "height", "distance", "rgb", "class"]
 PointPalette = Literal["turbo", "viridis", "plasma", "grayscale", "custom"]
 
-MAX_TRAJECTORY_POSES = 20_000
+MAX_TRAJECTORY_POSES = 2_000
+TRAJECTORY_APPEND_INTERVAL_NS = 500_000_000
+TRAJECTORY_FORCE_APPEND_NS = 2_000_000_000
+TRAJECTORY_MIN_DISTANCE_METERS = 0.02
+TRAJECTORY_PUBLISH_INTERVAL_NS = 500_000_000
+LIVE_GRPC_BUFFER_LIMIT = "32MiB"
 DEFAULT_GRPC_PORT = 9876
 DEFAULT_CORS_ORIGINS = (
     "http://127.0.0.1:5173",
@@ -66,27 +72,52 @@ class RerunBridge:
         self.metrics = metrics or BridgeMetrics()
         self._settings_provider = settings_provider or RerunSceneSettings
         self._settings = self._settings_provider()
-        self._recording = (recording_factory or rr.RecordingStream)("nodedc_mission_core_spatial")
-        blueprint = _blueprint(self._settings)
-        self._url = self._recording.serve_grpc(
-            grpc_port=grpc_port,
-            default_blueprint=blueprint,
-            server_memory_limit="512MiB",
-            newest_first=True,
-            cors_allow_origin=list(cors_allow_origin),
-        )
-        self._recording.send_blueprint(
-            blueprint,
-            make_active=True,
-            make_default=True,
-        )
-        self._recording.log("/world", rr.ViewCoordinates.RIGHT_HAND_Z_UP, static=True)
-        self._recording.log(
-            "/world/sensor_pose",
-            rr.TransformAxes3D(axis_length=0.45, show_frame=True),
-            static=True,
-        )
-        self._path: deque[tuple[float, float, float]] = deque(maxlen=MAX_TRAJECTORY_POSES)
+        if recording_factory is None:
+            recording = rr.RecordingStream(
+                "nodedc_mission_core_spatial",
+                recording_id=uuid4(),
+            )
+        else:
+            recording = recording_factory("nodedc_mission_core_spatial")
+        try:
+            blueprint = _blueprint(self._settings)
+            url = recording.serve_grpc(
+                grpc_port=grpc_port,
+                default_blueprint=blueprint,
+                # This is a reconnect cushion for the live preview, not the source
+                # of record. Raw MQTT evidence is persisted independently. A large
+                # late-client backlog can block the native SDK and freeze preview.
+                server_memory_limit=LIVE_GRPC_BUFFER_LIMIT,
+                # Rerun 0.34.1 can replay ActivateStore before StoreInfo when an
+                # evicted buffer is served newest-first, leaving late viewers on the
+                # welcome screen. Preserve protocol order within the bounded cache.
+                newest_first=False,
+                cors_allow_origin=list(cors_allow_origin),
+            )
+            recording.send_blueprint(
+                blueprint,
+                make_active=True,
+                make_default=True,
+            )
+            recording.log("/world", rr.ViewCoordinates.RIGHT_HAND_Z_UP, static=True)
+            recording.log(
+                "/world/sensor_pose",
+                rr.TransformAxes3D(axis_length=0.45, show_frame=True),
+                static=True,
+            )
+            # Do not expose a URL whose StoreInfo, blueprint and static scene are
+            # still waiting in the SDK micro-batcher.
+            recording.flush(timeout_sec=5.0)
+        except BaseException:
+            # Preserve the construction failure while still making a best
+            # effort to release a partially started native listener.
+            with suppress(BaseException):
+                recording.disconnect()
+            raise
+        self._recording = recording
+        self._url = url
+        self._path: list[tuple[float, float, float]] = []
+        self._last_path_append_source_ns = 0
         self._last_trajectory_publish_ns = 0
         self._last_point_count = 0
         self._closed = False
@@ -96,13 +127,14 @@ class RerunBridge:
         return self._url
 
     def begin_session(self, metrics: BridgeMetrics | None = None) -> None:
-        """Reset session-local state while keeping the process-wide server alive."""
+        """Reset session state while keeping the process-lifetime server alive."""
         if self._closed:
             raise RuntimeError("Rerun bridge is already closed")
         if metrics is not None:
             self.metrics = metrics
         self._settings = self._settings_provider()
         self._path.clear()
+        self._last_path_append_source_ns = 0
         self._last_trajectory_publish_ns = 0
         self._last_point_count = 0
         self._recording.set_time("stream_time", timestamp=time.time())
@@ -118,6 +150,10 @@ class RerunBridge:
             make_active=True,
             make_default=True,
         )
+        # VisualizationRuntime publishes grpc_url only after this method
+        # returns, so a late subscriber cannot race the initial StoreInfo and
+        # blueprint through the SDK micro-batcher.
+        self._recording.flush(timeout_sec=5.0)
 
     def process(self, envelope: DecodedDataPlaneView) -> None:
         self._apply_latest_settings()
@@ -158,12 +194,14 @@ class RerunBridge:
         self._closed = True
         recording = self._recording
         try:
-            recording.flush(timeout_sec=5.0)
+            try:
+                recording.flush(timeout_sec=5.0)
+            finally:
+                recording.disconnect()
         finally:
-            recording.disconnect()
-        # The Python wrapper owns the native gRPC server. Release it immediately
-        # instead of waiting for the publisher thread frame to be collected.
-        del self._recording
+            # The Python wrapper owns the native gRPC server. Release it even if
+            # flush or disconnect fails instead of waiting for garbage collection.
+            del self._recording
 
     def _set_message_time(self, envelope: DecodedDataPlaneView) -> None:
         context = envelope.context
@@ -207,25 +245,35 @@ class RerunBridge:
         )
 
     def _publish_pose(self, frame: DecodedPoseView) -> None:
+        publish_now_ns = time.monotonic_ns()
+        position = (
+            float(frame.position_xyz[0]),
+            float(frame.position_xyz[1]),
+            float(frame.position_xyz[2]),
+        )
         self._recording.log(
             "/world/sensor_pose",
             rr.Transform3D(
-                translation=frame.position_xyz,
+                translation=position,
                 quaternion=rr.Quaternion(xyzw=frame.orientation_xyzw),
             ),
         )
-        self._path.append(frame.position_xyz)
+
+        appended = self._append_trajectory_pose(
+            position,
+            frame.context.captured_at_epoch_ns,
+        )
         if not self._settings.show_trajectory:
             self._recording.log("/world/trajectory", rr.Clear(recursive=False))
             return
-        now_ns = time.monotonic_ns()
+        if not appended:
+            return
         if (
-            len(self._path) > 2
-            and len(self._path) % 20 != 0
-            and now_ns - self._last_trajectory_publish_ns < 200_000_000
+            publish_now_ns - self._last_trajectory_publish_ns
+            < TRAJECTORY_PUBLISH_INTERVAL_NS
         ):
             return
-        self._last_trajectory_publish_ns = now_ns
+        self._last_trajectory_publish_ns = publish_now_ns
         self._recording.log(
             "/world/trajectory",
             rr.LineStrips3D(
@@ -235,6 +283,39 @@ class RerunBridge:
             ),
         )
 
+    def _append_trajectory_pose(
+        self,
+        position: tuple[float, float, float],
+        source_time_ns: int,
+    ) -> bool:
+        if not self._path:
+            self._path.append(position)
+            self._last_path_append_source_ns = source_time_ns
+            return True
+
+        elapsed_ns = source_time_ns - self._last_path_append_source_ns
+        if elapsed_ns < 0:
+            # A source clock discontinuity must not freeze trajectory sampling
+            # until the timestamp catches up again. Preserve message order and
+            # start a new sampling interval at the discontinuity.
+            elapsed_ns = TRAJECTORY_FORCE_APPEND_NS
+        if elapsed_ns < TRAJECTORY_APPEND_INTERVAL_NS:
+            return False
+        if (
+            math.dist(self._path[-1], position) < TRAJECTORY_MIN_DISTANCE_METERS
+            and elapsed_ns < TRAJECTORY_FORCE_APPEND_NS
+        ):
+            return False
+
+        self._path.append(position)
+        self._last_path_append_source_ns = source_time_ns
+        if len(self._path) > MAX_TRAJECTORY_POSES:
+            last = self._path[-1]
+            self._path = self._path[::2]
+            if self._path[-1] != last:
+                self._path.append(last)
+        return True
+
 
 def _blueprint(settings: RerunSceneSettings) -> rrb.Blueprint:
     accumulation = max(0.0, settings.accumulation_seconds)
@@ -255,12 +336,22 @@ def _blueprint(settings: RerunSceneSettings) -> rrb.Blueprint:
             ),
             time_ranges=[time_range],
         ),
+        _live_time_panel(),
         auto_layout=False,
         auto_views=False,
         collapse_panels=True,
     )
 
 
+def _live_time_panel() -> rrb.TimePanel:
+    """Keep the hidden vendor timeline on its native live edge."""
+    return rrb.TimePanel(
+        timeline="stream_time",
+        play_state="following",
+        state="hidden",
+    )
+
+
 def _point_colors(
     positions: np.ndarray,
     intensities: np.ndarray,
diff --git a/src/k1link/viewer/runtime.py b/src/k1link/viewer/runtime.py
index 1158991..9ac3da1 100644
--- a/src/k1link/viewer/runtime.py
+++ b/src/k1link/viewer/runtime.py
@@ -28,6 +28,10 @@ RuntimePhase = Literal[
 SourceMode = Literal["idle", "live", "replay"]
 StateCallback = Callable[[], None]
 BridgeFactory = Callable[..., RerunBridge]
+# TODO: replace the mixed-modality FIFO with a latest point-cloud slot and a
+# bounded pose queue. The compact queue protects acquisition from a slow
+# visualizer, but under sustained pressure it can still evict pose messages.
+PREVIEW_QUEUE_SIZE = 4
 
 
 class CanonicalNormalizer(Protocol):
@@ -191,7 +195,13 @@ class VisualizationRuntime:
                 self._bridge = None
                 self._rerun_grpc_url = None
         if bridge is not None:
-            bridge.close()
+            try:
+                bridge.close()
+            except BaseException as exc:
+                self._finish_error(
+                    f"Ошибка завершения визуального моста: {type(exc).__name__}: {exc}"
+                )
+                raise
         self._notify()
 
     def _start(
@@ -308,7 +318,7 @@ class VisualizationRuntime:
         *,
         running_phase: RuntimePhase,
     ) -> None:
-        messages: queue.Queue[StreamMessage] = queue.Queue(maxsize=32)
+        messages: queue.Queue[StreamMessage] = queue.Queue(maxsize=PREVIEW_QUEUE_SIZE)
         source_done = threading.Event()
         publisher_ready = threading.Event()
         publisher_aborted = threading.Event()
@@ -334,23 +344,28 @@ class VisualizationRuntime:
         def publish() -> None:
             bridge: RerunBridge | None = None
             try:
-                bridge = self._bridge
+                with self._lock:
+                    bridge = self._bridge
+                    if self._closed:
+                        publisher_aborted.set()
+                if publisher_aborted.is_set():
+                    publisher_ready.set()
+                    return
                 if bridge is None:
                     candidate = self._bridge_factory(
                         grpc_port=self._grpc_port,
                         metrics=self._metrics,
                         settings_provider=self._current_scene_settings,
                     )
+                    bridge = candidate
                     with self._lock:
                         if self._closed:
                             publisher_aborted.set()
                         else:
                             self._bridge = candidate
-                            bridge = candidate
-                    if publisher_aborted.is_set():
-                        candidate.close()
-                        publisher_ready.set()
-                        return
+                if publisher_aborted.is_set():
+                    publisher_ready.set()
+                    return
                 assert bridge is not None
                 bridge.begin_session(self._metrics)
                 with self._lock:
@@ -402,12 +417,19 @@ class VisualizationRuntime:
             finally:
                 if bridge is not None:
                     with self._lock:
-                        close_bridge = self._closed and self._bridge is bridge
-                        if close_bridge:
+                        close_bridge = self._closed and (
+                            self._bridge is bridge or publisher_aborted.is_set()
+                        )
+                        if close_bridge and self._bridge is bridge:
                             self._bridge = None
                             self._rerun_grpc_url = None
                     if close_bridge:
-                        bridge.close()
+                        try:
+                            bridge.close()
+                        except BaseException as exc:
+                            # Process shutdown must not become a false successful
+                            # idle state when the native bridge failed to close.
+                            publisher_error.append(exc)
 
         def join_publisher() -> None:
             # Never orphan a publisher: the session thread remains its owner.
diff --git a/src/k1link/web/xgrids_k1_camera.py b/src/k1link/web/xgrids_k1_camera.py
new file mode 100644
index 0000000..fb9d095
--- /dev/null
+++ b/src/k1link/web/xgrids_k1_camera.py
@@ -0,0 +1,569 @@
+from __future__ import annotations
+
+import asyncio
+import os
+import queue
+import signal
+import subprocess
+import threading
+from collections import deque
+from contextlib import suppress
+from dataclasses import dataclass, field
+from pathlib import Path
+from typing import IO, Any, Final, Literal
+
+from fastapi import APIRouter, WebSocket, WebSocketDisconnect
+
+from k1link.mqtt import validate_private_ipv4
+
+CameraSourceId = Literal["sensor.camera.left", "sensor.camera.right"]
+
+CAMERA_SOURCE_PATHS: Final[dict[CameraSourceId, str]] = {
+    "sensor.camera.left": "/live/chn_left_main",
+    "sensor.camera.right": "/live/chn_right_main",
+}
+CAMERA_SOURCE_LABELS: Final[dict[CameraSourceId, str]] = {
+    "sensor.camera.left": "K1 · камера слева",
+    "sensor.camera.right": "K1 · камера справа",
+}
+CAMERA_MEDIA_TYPE: Final = 'video/mp4; codecs="avc1.641028"'
+CAMERA_EXCLUSIVE_GROUP: Final = "camera.preview.decoder"
+MAX_FMP4_BOX_BYTES: Final = 8 * 1024 * 1024
+MAX_FMP4_SEGMENT_BYTES: Final = 1024 * 1024
+MAX_QUEUED_SEGMENTS: Final = 4
+
+
+@dataclass
+class CameraProcessLease:
+    generation: int
+    source_id: CameraSourceId
+    process: subprocess.Popen[bytes]
+    stderr_tail: deque[str] = field(default_factory=lambda: deque(maxlen=12))
+    segments: queue.Queue[tuple[str, bytes] | None] = field(
+        default_factory=lambda: queue.Queue(maxsize=MAX_QUEUED_SEGMENTS)
+    )
+    failure_code: str | None = None
+
+
+class XgridsK1CameraGateway:
+    """One fail-closed K1 RTSP owner with a browser-safe fMP4 delivery plane.
+
+    Selection and delivery are deliberately separate. A plugin action selects
+    one allowlisted producer and publishes an opaque generation. Only a matching
+    WebSocket may then start FFmpeg. This keeps the device address and RTSP path
+    out of the generic UI and prevents two browser windows from opening two K1
+    sessions.
+    """
+
+    def __init__(self, repository_root: Path, plugin_id: str) -> None:
+        self._repository_root = repository_root.resolve()
+        self._plugin_id = plugin_id
+        self._lock = threading.RLock()
+        self._revision = 0
+        self._generation = 0
+        self._phase = "idle"
+        self._source_id: CameraSourceId | None = None
+        self._target_host: str | None = None
+        self._process: subprocess.Popen[bytes] | None = None
+        self._process_generation: int | None = None
+        self._error: dict[str, str] | None = None
+        self._closed = False
+        self._ffmpeg_path, self._ffmpeg_source = _resolve_ffmpeg(self._repository_root)
+
+    def snapshot(self) -> dict[str, Any]:
+        with self._lock:
+            delivery = None
+            if (
+                self._source_id is not None
+                and self._ffmpeg_path is not None
+                and self._phase != "error"
+            ):
+                delivery = {
+                    "id": f"camera-preview-{self._generation}",
+                    "kind": "mse-fmp4-websocket",
+                    "url": (
+                        f"/api/v1/device-plugins/{self._plugin_id}"
+                        f"/camera-preview/{self._generation}"
+                    ),
+                    "media_type": CAMERA_MEDIA_TYPE,
+                }
+            return {
+                "schema_version": "missioncore.camera-preview/v1alpha1",
+                "phase": self._phase,
+                "revision": self._revision,
+                "generation": self._generation if self._source_id is not None else None,
+                "active_source_id": self._source_id,
+                "activation": {
+                    "exclusive_group": CAMERA_EXCLUSIVE_GROUP,
+                    "max_active": 1,
+                },
+                "delivery": delivery,
+                "runtime_dependency": {
+                    "kind": "ffmpeg",
+                    "status": "available" if self._ffmpeg_path is not None else "missing",
+                    "source": self._ffmpeg_source,
+                },
+                "error": dict(self._error) if self._error is not None else None,
+            }
+
+    def select(self, source_id: CameraSourceId, target_host: str) -> dict[str, Any]:
+        if source_id not in CAMERA_SOURCE_PATHS:
+            raise ValueError("неизвестный camera source")
+        target = validate_private_ipv4(target_host)
+
+        old_process: subprocess.Popen[bytes] | None = None
+        with self._lock:
+            if self._closed:
+                raise RuntimeError("camera gateway уже закрыт")
+            if self._ffmpeg_path is None:
+                self._generation += 1
+                self._revision += 1
+                self._source_id = source_id
+                self._target_host = target
+                self._phase = "error"
+                self._error = {
+                    "code": "ffmpeg-unavailable",
+                    "message": "Локальный camera adapter FFmpeg не найден.",
+                }
+                raise RuntimeError("локальный camera adapter FFmpeg не найден")
+            if (
+                self._source_id == source_id
+                and self._target_host == target
+                and self._phase in {"selected", "connecting", "streaming"}
+            ):
+                return self.snapshot()
+
+            old_process = self._detach_process_locked()
+            self._generation += 1
+            self._revision += 1
+            self._source_id = source_id
+            self._target_host = target
+            self._phase = "selected"
+            self._error = None
+
+        _terminate_process(old_process)
+        return self.snapshot()
+
+    def stop(self, generation: int) -> dict[str, Any]:
+        old_process: subprocess.Popen[bytes] | None
+        with self._lock:
+            if self._source_id is None:
+                return self.snapshot()
+            if generation != self._generation:
+                raise ValueError("camera preview generation устарело")
+            old_process = self._detach_process_locked()
+            self._revision += 1
+            self._phase = "idle"
+            self._source_id = None
+            self._target_host = None
+            self._error = None
+        _terminate_process(old_process)
+        return self.snapshot()
+
+    def stop_current(self) -> dict[str, Any]:
+        old_process: subprocess.Popen[bytes] | None
+        with self._lock:
+            old_process = self._detach_process_locked()
+            changed = self._source_id is not None or self._phase != "idle"
+            if changed:
+                self._revision += 1
+            self._phase = "idle"
+            self._source_id = None
+            self._target_host = None
+            self._error = None
+        _terminate_process(old_process)
+        return self.snapshot()
+
+    def open_delivery(self, generation: int) -> CameraProcessLease:
+        with self._lock:
+            if self._closed:
+                raise RuntimeError("camera gateway закрыт")
+            if generation != self._generation or self._source_id is None:
+                raise ValueError("camera preview generation не активно")
+            if self._process is not None:
+                raise RuntimeError("для camera preview уже открыт browser consumer")
+            if self._ffmpeg_path is None or self._target_host is None:
+                raise RuntimeError("camera preview runtime не готов")
+
+            argv = _build_ffmpeg_argv(
+                self._ffmpeg_path,
+                self._target_host,
+                self._source_id,
+            )
+            try:
+                process = subprocess.Popen(
+                    argv,
+                    stdin=subprocess.DEVNULL,
+                    stdout=subprocess.PIPE,
+                    stderr=subprocess.PIPE,
+                    shell=False,
+                    start_new_session=(os.name == "posix"),
+                )
+            except OSError as exc:
+                self._revision += 1
+                self._phase = "error"
+                self._error = {
+                    "code": "ffmpeg-start-failed",
+                    "message": "Не удалось запустить локальный camera adapter.",
+                }
+                raise RuntimeError("не удалось запустить camera adapter") from exc
+
+            if process.stdout is None or process.stderr is None:
+                _terminate_process(process)
+                raise RuntimeError("camera adapter не открыл media pipes")
+            lease = CameraProcessLease(
+                generation=generation,
+                source_id=self._source_id,
+                process=process,
+            )
+            self._process = process
+            self._process_generation = generation
+            self._revision += 1
+            self._phase = "connecting"
+            self._error = None
+
+        threading.Thread(
+            target=_drain_stderr,
+            args=(lease,),
+            name=f"k1-camera-stderr-{generation}",
+            daemon=True,
+        ).start()
+        threading.Thread(
+            target=_read_fmp4_stdout,
+            args=(lease,),
+            name=f"k1-camera-fmp4-{generation}",
+            daemon=True,
+        ).start()
+        return lease
+
+    def mark_streaming(self, lease: CameraProcessLease) -> None:
+        with self._lock:
+            if (
+                lease.generation != self._generation
+                or self._process is not lease.process
+                or self._phase == "streaming"
+            ):
+                return
+            self._revision += 1
+            self._phase = "streaming"
+
+    def release_delivery(self, lease: CameraProcessLease, *, client_closed: bool) -> None:
+        _terminate_process(lease.process)
+        with self._lock:
+            if self._process is lease.process:
+                self._process = None
+                self._process_generation = None
+            if lease.generation != self._generation or self._source_id is None:
+                return
+            self._revision += 1
+            if client_closed:
+                self._phase = "selected"
+                self._error = None
+            else:
+                self._phase = "error"
+                if lease.failure_code == "consumer-too-slow":
+                    message = (
+                        "Browser не успевает принимать camera stream; "
+                        "канал остановлен без накопления задержки."
+                    )
+                elif lease.failure_code == "invalid-fmp4":
+                    message = "Camera adapter вернул некорректный fMP4 stream."
+                elif lease.failure_code == "segment-too-large":
+                    message = "Camera adapter отклонил слишком большой video segment."
+                else:
+                    message = _safe_ffmpeg_message(lease.stderr_tail)
+                self._error = {
+                    "code": lease.failure_code or "camera-source-ended",
+                    "message": message,
+                }
+
+    def close(self) -> None:
+        old_process: subprocess.Popen[bytes] | None
+        with self._lock:
+            if self._closed:
+                return
+            self._closed = True
+            old_process = self._detach_process_locked()
+            self._revision += 1
+            self._phase = "idle"
+            self._source_id = None
+            self._target_host = None
+            self._error = None
+        _terminate_process(old_process)
+
+    def _detach_process_locked(self) -> subprocess.Popen[bytes] | None:
+        process = self._process
+        self._process = None
+        self._process_generation = None
+        return process
+
+
+def _resolve_ffmpeg(repository_root: Path) -> tuple[Path | None, str]:
+    configured = os.environ.get("MISSIONCORE_FFMPEG_BINARY")
+    candidates: list[tuple[Path, str]] = []
+    if configured:
+        candidates.append((Path(configured).expanduser(), "configured"))
+    candidates.append((repository_root / ".runtime" / "ffmpeg" / "ffmpeg", "bundled-local"))
+    # Explicit development-only fallbacks. Product packaging must provide the
+    # repository-local binary or MISSIONCORE_FFMPEG_BINARY instead.
+    candidates.extend(
+        (
+            (Path("/opt/homebrew/bin/ffmpeg"), "development-system"),
+            (Path("/usr/local/bin/ffmpeg"), "development-system"),
+        )
+    )
+    for candidate, source in candidates:
+        try:
+            resolved = candidate.resolve(strict=True)
+        except OSError:
+            continue
+        if resolved.is_file() and os.access(resolved, os.X_OK):
+            return resolved, source
+    return None, "missing"
+
+
+def _build_ffmpeg_argv(
+    ffmpeg_path: Path,
+    target_host: str,
+    source_id: CameraSourceId,
+) -> list[str]:
+    target = validate_private_ipv4(target_host)
+    path = CAMERA_SOURCE_PATHS.get(source_id)
+    if path is None:
+        raise ValueError("неизвестный camera source")
+    upstream = f"rtsp://{target}:8554{path}"
+    return [
+        str(ffmpeg_path),
+        "-hide_banner",
+        "-loglevel",
+        "warning",
+        "-nostdin",
+        "-rtsp_transport",
+        "tcp",
+        "-allowed_media_types",
+        "video",
+        "-timeout",
+        "5000000",
+        "-probesize",
+        "4000000",
+        "-analyzeduration",
+        "2000000",
+        "-fflags",
+        "nobuffer",
+        "-i",
+        upstream,
+        "-map",
+        "0:v:0",
+        "-an",
+        "-sn",
+        "-dn",
+        "-c:v",
+        "copy",
+        "-f",
+        "mp4",
+        "-movflags",
+        "+empty_moov+default_base_moof+omit_tfhd_offset+frag_every_frame+skip_trailer",
+        "-flush_packets",
+        "1",
+        "pipe:1",
+    ]
+
+
+def _read_exact(stream: IO[bytes], size: int) -> bytes:
+    chunks: list[bytes] = []
+    remaining = size
+    while remaining:
+        chunk = stream.read(remaining)
+        if not chunk:
+            raise EOFError
+        chunks.append(chunk)
+        remaining -= len(chunk)
+    return b"".join(chunks)
+
+
+def _read_mp4_box(stream: IO[bytes]) -> tuple[bytes, bytes]:
+    header = _read_exact(stream, 8)
+    size = int.from_bytes(header[:4], "big")
+    box_type = header[4:8]
+    if size == 1:
+        extended = _read_exact(stream, 8)
+        size = int.from_bytes(extended, "big")
+        header += extended
+    if size == 0 or size < len(header) or size > MAX_FMP4_BOX_BYTES:
+        raise ValueError("invalid or unbounded ISO-BMFF box")
+    return box_type, header + _read_exact(stream, size - len(header))
+
+
+def _enqueue_segment(lease: CameraProcessLease, kind: str, payload: bytes) -> bool:
+    if len(payload) > MAX_FMP4_SEGMENT_BYTES:
+        lease.failure_code = "segment-too-large"
+        _finish_segment_queue(lease)
+        with suppress(OSError):
+            lease.process.terminate()
+        return False
+    try:
+        lease.segments.put_nowait((kind, payload))
+        return True
+    except queue.Full:
+        lease.failure_code = "consumer-too-slow"
+        while True:
+            try:
+                lease.segments.get_nowait()
+            except queue.Empty:
+                break
+        lease.segments.put_nowait(None)
+        with suppress(OSError):
+            lease.process.terminate()
+        return False
+
+
+def _finish_segment_queue(lease: CameraProcessLease) -> None:
+    try:
+        lease.segments.put_nowait(None)
+    except queue.Full:
+        # A full queue is itself a bounded-latency failure. Never leave FFmpeg
+        # back-pressured while the browser accumulates tens of seconds.
+        lease.failure_code = lease.failure_code or "consumer-too-slow"
+        while True:
+            try:
+                lease.segments.get_nowait()
+            except queue.Empty:
+                break
+        lease.segments.put_nowait(None)
+
+
+def _read_fmp4_stdout(lease: CameraProcessLease) -> None:
+    stream = lease.process.stdout
+    if stream is None:
+        lease.failure_code = "invalid-fmp4"
+        _finish_segment_queue(lease)
+        return
+
+    init_parts: list[bytes] = []
+    fragment_parts: list[bytes] = []
+    init_sent = False
+    try:
+        while True:
+            box_type, box = _read_mp4_box(stream)
+            if not init_sent:
+                init_parts.append(box)
+                if box_type == b"moov":
+                    if not _enqueue_segment(lease, "init", b"".join(init_parts)):
+                        return
+                    init_sent = True
+                continue
+
+            if box_type == b"moof":
+                fragment_parts = [box]
+                continue
+            if fragment_parts:
+                fragment_parts.append(box)
+                if box_type == b"mdat":
+                    if not _enqueue_segment(lease, "media", b"".join(fragment_parts)):
+                        return
+                    fragment_parts = []
+                continue
+            # `styp`/`sidx` are valid media-segment prefixes. Preserve them and
+            # wait for the following moof+mdat instead of forwarding raw boxes.
+            if box_type in {b"styp", b"sidx"}:
+                fragment_parts.append(box)
+    except EOFError:
+        if not init_sent:
+            lease.failure_code = "invalid-fmp4"
+    except (OSError, ValueError):
+        lease.failure_code = "invalid-fmp4"
+    finally:
+        _finish_segment_queue(lease)
+
+
+def _drain_stderr(lease: CameraProcessLease) -> None:
+    stream = lease.process.stderr
+    if stream is None:
+        return
+    try:
+        while True:
+            line = stream.readline()
+            if not line:
+                return
+            text = line.decode("utf-8", errors="replace").strip()
+            if text:
+                lease.stderr_tail.append(text[-240:])
+    except (OSError, ValueError):
+        return
+
+
+def _safe_ffmpeg_message(stderr_tail: deque[str]) -> str:
+    # Never reflect the RTSP URL or device address into browser state.
+    joined = " ".join(stderr_tail).lower()
+    if "connection refused" in joined:
+        return "Camera endpoint отклонил локальное соединение."
+    if "timed out" in joined or "timeout" in joined:
+        return "Camera endpoint не ответил за отведённое время."
+    if "invalid data" in joined or "could not find codec" in joined:
+        return "Camera endpoint вернул неподдерживаемый media stream."
+    return "Camera stream завершился до первого пригодного видеофрагмента."
+
+
+def _terminate_process(process: subprocess.Popen[bytes] | None) -> None:
+    if process is None:
+        return
+    try:
+        if process.poll() is None:
+            if os.name == "posix":
+                with suppress(ProcessLookupError):
+                    os.killpg(process.pid, signal.SIGINT)
+            else:
+                process.terminate()
+            try:
+                process.wait(timeout=2.0)
+            except subprocess.TimeoutExpired:
+                process.terminate()
+                try:
+                    process.wait(timeout=1.0)
+                except subprocess.TimeoutExpired:
+                    process.kill()
+                    process.wait(timeout=1.0)
+    finally:
+        for stream in (process.stdout, process.stderr):
+            if stream is not None:
+                with suppress(OSError):
+                    stream.close()
+
+
+def build_xgrids_k1_camera_router(
+    gateway: XgridsK1CameraGateway,
+    plugin_id: str,
+) -> APIRouter:
+    router = APIRouter(include_in_schema=False)
+
+    @router.websocket(
+        f"/api/v1/device-plugins/{plugin_id}/camera-preview/{{generation}}"
+    )
+    async def camera_preview(websocket: WebSocket, generation: int) -> None:
+        await websocket.accept()
+        try:
+            lease = gateway.open_delivery(generation)
+        except (ValueError, RuntimeError):
+            await websocket.close(code=1008, reason="Camera preview lease is not active")
+            return
+
+        client_closed = False
+        try:
+            while True:
+                segment = await asyncio.to_thread(lease.segments.get)
+                if segment is None:
+                    break
+                kind, payload = segment
+                if kind == "media":
+                    gateway.mark_streaming(lease)
+                await websocket.send_bytes(payload)
+        except WebSocketDisconnect:
+            client_closed = True
+        except RuntimeError:
+            client_closed = True
+        finally:
+            gateway.release_delivery(lease, client_closed=client_closed)
+            with suppress(RuntimeError):
+                await websocket.close()
+
+    return router
diff --git a/src/k1link/web/xgrids_k1_facade.py b/src/k1link/web/xgrids_k1_facade.py
index 4415b6d..8548900 100644
--- a/src/k1link/web/xgrids_k1_facade.py
+++ b/src/k1link/web/xgrids_k1_facade.py
@@ -35,6 +35,14 @@ from k1link.web.plugin_runtime import (
     PluginActionNotFoundError,
     PluginExecutionError,
 )
+from k1link.web.xgrids_k1_camera import (
+    CAMERA_EXCLUSIVE_GROUP,
+    CAMERA_SOURCE_LABELS,
+    CAMERA_SOURCE_PATHS,
+    CameraSourceId,
+    XgridsK1CameraGateway,
+    build_xgrids_k1_camera_router,
+)
 
 XGRIDS_K1_PLUGIN_ID = "nodedc.device.xgrids-lixelkity-k1"
 XGRIDS_K1_MODEL_ID = "xgrids.lixelkity-k1"
@@ -55,6 +63,8 @@ ACTION_ACQUISITION_STATE_READ = "acquisition.state.read"
 ACTION_STREAM_START_LIVE = "stream.start-live"
 ACTION_STREAM_START_REPLAY = "stream.start-replay"
 ACTION_STREAM_STOP = "stream.stop"
+ACTION_CAMERA_PREVIEW_SELECT = "camera.preview.select"
+ACTION_CAMERA_PREVIEW_STOP = "camera.preview.stop"
 ACTION_VIEWER_SETTINGS_UPDATE = "viewer.settings.update"
 
 RequestedStreamId = Literal[
@@ -145,6 +155,16 @@ class ReplayRequest(StrictRequest):
     loop: bool = False
 
 
+class CameraPreviewSelectRequest(StrictRequest):
+    source_id: CameraSourceId
+    device_session_id: str = Field(min_length=1, max_length=128)
+
+
+class CameraPreviewStopRequest(StrictRequest):
+    device_session_id: str = Field(min_length=1, max_length=128)
+    generation: int = Field(ge=1)
+
+
 class ViewerSettingsRequest(StrictRequest):
     point_size: float = Field(default=2.5, ge=0.5, le=12.0)
     color_mode: Literal["intensity", "height", "distance", "rgb", "class"] = "intensity"
@@ -189,10 +209,15 @@ class XgridsK1CompatibilityService:
         # The host-owned visual runtime receives the vendor normalizer
         # explicitly. There is no implicit K1 decoder in the visual layer.
         self.runtime = VisualizationRuntime(normalizer=normalize_k1_message)
+        self.camera_preview = XgridsK1CameraGateway(
+            self.repository_root,
+            XGRIDS_K1_PLUGIN_ID,
+        )
 
     def state(self) -> dict[str, Any]:
         runtime = self.runtime.snapshot()
         self._reconcile_acquisition(runtime)
+        camera_preview = self.camera_preview.snapshot()
         metrics = runtime["metrics"]
         with self._lock:
             operation_phase = self._operation_phase
@@ -264,7 +289,11 @@ class XgridsK1CompatibilityService:
                 "attestation": compatibility_attestation,
                 "vendor_writes_enabled": False,
                 "camera_preview": (
-                    "observed-runtime-adapter-pending"
+                    (
+                        "local-browser-adapter-available"
+                        if camera_preview["runtime_dependency"]["status"] == "available"
+                        else "local-runtime-dependency-missing"
+                    )
                     if active_profile_id is not None
                     else "unverified"
                 ),
@@ -292,8 +321,13 @@ class XgridsK1CompatibilityService:
                 else None
             ),
             "connection_verification": connection_verification,
-            "sensor_catalog": _sensor_catalog(active_profile_id),
+            "sensor_catalog": _sensor_catalog(
+                active_profile_id,
+                device_session_id,
+                camera_preview,
+            ),
             "device_calibration": _device_calibration_snapshot(active_profile_id),
+            "camera_preview": camera_preview,
             "acquisition": acquisition,
             "operations": operation_documents,
             "last_operation": operation_documents[-1] if operation_documents else None,
@@ -367,6 +401,9 @@ class XgridsK1CompatibilityService:
         known_ids = {str(item["device_id"]) for item in self.state()["devices"]}
         if request.device_id not in known_ids:
             raise ValueError("сначала найдите и выберите устройство через Bluetooth")
+        # A reprovision can replace both the device session and its address.
+        # Revoke the previous browser lease before any new device-side write.
+        self.camera_preview.stop_current()
         # Unwrap once at the provisioning service boundary. The plain value is
         # kept only in this stack frame, included in a keyed request digest, and
         # passed to the reviewed BLE write boundary; it is never journaled.
@@ -808,6 +845,7 @@ class XgridsK1CompatibilityService:
         try:
             with self._lock:
                 acquisition.transition("stopping", message_code="acquisition.stopping")
+            self.camera_preview.stop_current()
             self.runtime.stop()
             self._cancel_pending_acquisition_operations(
                 exclude_operation_id=operation.operation_id,
@@ -877,6 +915,7 @@ class XgridsK1CompatibilityService:
             return self.state()
         try:
             if acquisition.state not in TERMINAL_ACQUISITION_STATES:
+                self.camera_preview.stop_current()
                 self.runtime.stop()
                 self._cancel_pending_acquisition_operations(
                     exclude_operation_id=operation.operation_id,
@@ -958,6 +997,7 @@ class XgridsK1CompatibilityService:
     def stop(self) -> dict[str, Any]:
         """Deprecated capture-only shim; it never claims that K1 stopped scanning."""
 
+        self.camera_preview.stop_current()
         with self._lock:
             acquisition = self._acquisition
         if acquisition is None or acquisition.state in TERMINAL_ACQUISITION_STATES:
@@ -970,6 +1010,34 @@ class XgridsK1CompatibilityService:
             )
         )
 
+    def select_camera_preview(self, request: CameraPreviewSelectRequest) -> dict[str, Any]:
+        target = self._camera_target_for_session(request.device_session_id)
+        self.camera_preview.select(request.source_id, target)
+        return self.state()
+
+    def stop_camera_preview(self, request: CameraPreviewStopRequest) -> dict[str, Any]:
+        self._camera_target_for_session(request.device_session_id)
+        self.camera_preview.stop(request.generation)
+        return self.state()
+
+    def close(self) -> None:
+        camera_error: Exception | None = None
+        try:
+            self.camera_preview.close()
+        except Exception as exc:
+            camera_error = exc
+        try:
+            self.runtime.close()
+        except Exception as exc:
+            if camera_error is not None:
+                exc.add_note(
+                    "camera gateway cleanup also failed: "
+                    f"{type(camera_error).__name__}: {camera_error}"
+                )
+            raise
+        if camera_error is not None:
+            raise camera_error
+
     def update_viewer_settings(self, request: ViewerSettingsRequest) -> dict[str, Any]:
         self.runtime.update_scene_settings(
             RerunSceneSettings(
@@ -1034,6 +1102,22 @@ class XgridsK1CompatibilityService:
                 self._device_session_opened_at = _utc_now_iso()
             return self._device_id, self._device_session_id
 
+    def _camera_target_for_session(self, device_session_id: str) -> str:
+        with self._lock:
+            current_session_id = self._device_session_id
+            target = self._k1_ip
+            attestation = self._compatibility_attestation
+        if current_session_id is None or device_session_id != current_session_id:
+            raise ValueError("указана неактивная device-сессия")
+        if attestation is None:
+            raise ValueError("точный compatibility-профиль K1 не подтверждён")
+        if target is None:
+            raise ValueError("у плагина нет подтверждённого локального адреса K1")
+        target = validate_private_ipv4(target)
+        if target == AP_FALLBACK_IPV4:
+            raise ValueError("адрес точки доступа K1 нельзя использовать как camera target")
+        return target
+
     def _require_acquisition(self, acquisition_id: str | None) -> AcquisitionRecord:
         with self._lock:
             acquisition = self._acquisition
@@ -1212,6 +1296,10 @@ class XgridsK1ServicePort(Protocol):
 
     def stop(self) -> dict[str, Any]: ...
 
+    def select_camera_preview(self, request: CameraPreviewSelectRequest) -> dict[str, Any]: ...
+
+    def stop_camera_preview(self, request: CameraPreviewStopRequest) -> dict[str, Any]: ...
+
     def update_viewer_settings(self, request: ViewerSettingsRequest) -> dict[str, Any]: ...
 
 
@@ -1236,6 +1324,8 @@ class XgridsK1PluginFacade:
             ACTION_STREAM_START_LIVE,
             ACTION_STREAM_START_REPLAY,
             ACTION_STREAM_STOP,
+            ACTION_CAMERA_PREVIEW_SELECT,
+            ACTION_CAMERA_PREVIEW_STOP,
             ACTION_VIEWER_SETTINGS_UPDATE,
         }
     )
@@ -1309,6 +1399,18 @@ class XgridsK1PluginFacade:
         if action_id == ACTION_STREAM_STOP:
             EmptyRequest.model_validate(payload)
             return await asyncio.to_thread(self.service.stop)
+        if action_id == ACTION_CAMERA_PREVIEW_SELECT:
+            select_camera_request = CameraPreviewSelectRequest.model_validate(payload)
+            return await asyncio.to_thread(
+                self.service.select_camera_preview,
+                select_camera_request,
+            )
+        if action_id == ACTION_CAMERA_PREVIEW_STOP:
+            stop_camera_request = CameraPreviewStopRequest.model_validate(payload)
+            return await asyncio.to_thread(
+                self.service.stop_camera_preview,
+                stop_camera_request,
+            )
         if action_id == ACTION_VIEWER_SETTINGS_UPDATE:
             settings_request = ViewerSettingsRequest.model_validate(payload)
             return await asyncio.to_thread(
@@ -1362,8 +1464,67 @@ def _attestation_snapshot(
     }
 
 
-def _sensor_catalog(active_profile_id: str | None) -> dict[str, Any]:
+def _sensor_catalog(
+    active_profile_id: str | None,
+    device_session_id: str | None,
+    camera_preview: Mapping[str, Any],
+) -> dict[str, Any]:
     camera_profile_active = active_profile_id is not None
+    camera_phase = str(camera_preview.get("phase") or "idle")
+    active_camera = camera_preview.get("active_source_id")
+    delivery = camera_preview.get("delivery")
+    dependency = camera_preview.get("runtime_dependency")
+    dependency_available = (
+        isinstance(dependency, Mapping) and dependency.get("status") == "available"
+    )
+    camera_streams: list[dict[str, Any]] = []
+    for source_id in CAMERA_SOURCE_PATHS:
+        side = "left" if source_id.endswith(".left") else "right"
+        selected = source_id == active_camera
+        if not camera_profile_active:
+            availability = "unverified"
+        elif not dependency_available:
+            availability = "unavailable"
+        elif selected and camera_phase == "streaming":
+            availability = "streaming"
+        elif selected and camera_phase == "error":
+            availability = "error"
+        elif selected:
+            availability = "connecting"
+        else:
+            availability = "available"
+        camera_streams.append(
+            {
+                "stream_id": f"camera.preview.{side}.live",
+                "source_id": source_id,
+                "semantic_channel_id": "camera.preview.live",
+                "label": CAMERA_SOURCE_LABELS[source_id],
+                "sensor_kind": "camera",
+                "modality": "encoded-video",
+                "availability": availability,
+                "decode_status": (
+                    "rtsp-h264-observed-browser-remux"
+                    if camera_profile_active and dependency_available
+                    else (
+                        "local-runtime-dependency-missing"
+                        if camera_profile_active
+                        else "profile-not-attested"
+                    )
+                ),
+                "endpoint_label": f"RTSP · {side}",
+                "activation": {
+                    "group_id": CAMERA_EXCLUSIVE_GROUP,
+                    "max_active": 1,
+                    "selected": selected,
+                    "controllable": bool(
+                        camera_profile_active and device_session_id and dependency_available
+                    ),
+                },
+                "delivery": delivery if selected and isinstance(delivery, Mapping) else None,
+                "frame_id": None,
+                "coordinate_convention": "unresolved",
+            }
+        )
     return {
         "schema_version": "missioncore.sensor-catalog/v1alpha2",
         "revision": active_profile_id or "unprofiled-evidence-only",
@@ -1404,19 +1565,7 @@ def _sensor_catalog(active_profile_id: str | None) -> dict[str, Any]:
                 "frame_id": None,
                 "coordinate_convention": None,
             },
-            {
-                "stream_id": "camera.preview.live",
-                "sensor_kind": "camera-rig",
-                "modality": "encoded-video",
-                "availability": "observed" if camera_profile_active else "unverified",
-                "decode_status": (
-                    "transport-observed-runtime-adapter-pending"
-                    if camera_profile_active
-                    else "profile-not-attested"
-                ),
-                "frame_id": None,
-                "coordinate_convention": None,
-            },
+            *camera_streams,
         ],
     }
 
@@ -1497,6 +1646,12 @@ def build_xgrids_k1_plugin(repository_root: Path) -> DevicePluginRuntimeContribu
     adapter = XgridsK1PluginFacade(service)
     return DevicePluginRuntimeContribution(
         adapter=adapter,
-        legacy_routers=(build_xgrids_k1_legacy_router(adapter),),
-        close=service.runtime.close,
+        legacy_routers=(
+            build_xgrids_k1_legacy_router(adapter),
+            build_xgrids_k1_camera_router(
+                service.camera_preview,
+                XGRIDS_K1_PLUGIN_ID,
+            ),
+        ),
+        close=service.close,
     )
diff --git a/tests/test_plugin_catalog.py b/tests/test_plugin_catalog.py
index 86192ae..c12ee04 100644
--- a/tests/test_plugin_catalog.py
+++ b/tests/test_plugin_catalog.py
@@ -88,7 +88,7 @@ def test_repository_catalog_exposes_xgrids_model() -> None:
         item for item in plugins if item["metadata"]["id"] == "nodedc.device.xgrids-lixelkity-k1"
     )
     assert plugin["apiVersion"] == "missioncore.nodedc/v1alpha2"
-    assert plugin["metadata"]["version"] == "0.2.0"
+    assert plugin["metadata"]["version"] == "0.3.0"
     assert plugin["spec"]["hostApiRange"] == "v1alpha2"
     assert plugin["spec"]["compatibilityProfiles"] == [
         {
@@ -113,11 +113,13 @@ def test_repository_catalog_exposes_xgrids_model() -> None:
         "stream.start-live",
         "stream.start-replay",
         "stream.stop",
+        "camera.preview.select",
+        "camera.preview.stop",
         "viewer.settings.update",
     } <= action_ids
     assert next(item for item in models if item["id"] == "xgrids.lixelkity-k1") == {
         "pluginId": "nodedc.device.xgrids-lixelkity-k1",
-        "pluginVersion": "0.2.0",
+        "pluginVersion": "0.3.0",
         "id": "xgrids.lixelkity-k1",
         "vendor": "XGRIDS",
         "displayName": "XGRIDS LixelKity K1",
@@ -135,6 +137,7 @@ def test_repository_catalog_exposes_xgrids_model() -> None:
             },
             {"id": "spatial.point-cloud.live", "label": "Облако точек"},
             {"id": "spatial.pose.live", "label": "Траектория"},
+            {"id": "camera.preview.live", "label": "Видеокамеры"},
             {"id": "evidence.raw-capture", "label": "Исходная запись"},
             {"id": "evidence.replay", "label": "Повтор записи"},
         ],
diff --git a/tests/test_rerun_bridge.py b/tests/test_rerun_bridge.py
index a4879dd..e607ae6 100644
--- a/tests/test_rerun_bridge.py
+++ b/tests/test_rerun_bridge.py
@@ -1,7 +1,6 @@
 from __future__ import annotations
 
 import json
-import socket
 import struct
 import threading
 import time
@@ -14,7 +13,12 @@ from k1link.data_plane import DecodedDataPlaneView, NormalizationError
 from k1link.mqtt.capture import FRAME_HEADER, RAW_MAGIC
 from k1link.protocol.normalizer import normalize_k1_message
 from k1link.viewer.messages import StreamMessage
-from k1link.viewer.rerun_bridge import RerunBridge, RerunSceneSettings, _point_colors
+from k1link.viewer.rerun_bridge import (
+    RerunBridge,
+    RerunSceneSettings,
+    _live_time_panel,
+    _point_colors,
+)
 from k1link.viewer.runtime import VisualizationRuntime
 
 
@@ -24,6 +28,7 @@ class FakeRecording:
         self.times: list[tuple[str, dict[str, object]]] = []
         self.blueprints: list[object] = []
         self.disconnected = False
+        self.flush_count = 0
 
     def serve_grpc(self, **_: object) -> str:
         return "rerun+http://127.0.0.1:9876/proxy"
@@ -41,23 +46,52 @@ class FakeRecording:
         self.disconnected = True
 
     def flush(self, **_: object) -> None:
-        return
+        self.flush_count += 1
 
 
-def _message(topic: str, payload: bytes, *, sequence: int = 7) -> StreamMessage:
+class BlueprintFailureRecording(FakeRecording):
+    def send_blueprint(self, blueprint: object, **kwargs: object) -> None:
+        super().send_blueprint(blueprint, **kwargs)
+        raise RuntimeError("synthetic blueprint failure")
+
+
+class DisconnectFailureRecording(FakeRecording):
+    def disconnect(self) -> None:
+        super().disconnect()
+        raise RuntimeError("synthetic disconnect failure")
+
+
+def _message(
+    topic: str,
+    payload: bytes,
+    *,
+    sequence: int = 7,
+    received_at_epoch_ns: int = 1_784_124_315_186_225_000,
+) -> StreamMessage:
     return StreamMessage(
         sequence=sequence,
         topic=topic,
         payload=payload,
-        received_at_epoch_ns=1_784_124_315_186_225_000,
+        received_at_epoch_ns=received_at_epoch_ns,
         received_monotonic_ns=None,
         source="test",
     )
 
 
-def _envelope(topic: str, payload: bytes, *, sequence: int = 7) -> DecodedDataPlaneView:
+def _envelope(
+    topic: str,
+    payload: bytes,
+    *,
+    sequence: int = 7,
+    received_at_epoch_ns: int = 1_784_124_315_186_225_000,
+) -> DecodedDataPlaneView:
     envelope = normalize_k1_message(
-        _message(topic, payload, sequence=sequence),
+        _message(
+            topic,
+            payload,
+            sequence=sequence,
+            received_at_epoch_ns=received_at_epoch_ns,
+        ),
         processing_started_monotonic_ns=time.monotonic_ns(),
     )
     assert envelope is not None
@@ -89,9 +123,58 @@ def test_legacy_points_and_pose_are_logged_to_rerun() -> None:
         "message_sequence",
         "stream_time",
     }
+    assert recording.flush_count == 1
 
     bridge.close()
     assert recording.disconnected is True
+    assert recording.flush_count == 2
+
+
+def test_live_blueprint_follows_stream_time_without_frontend_cursor_writes() -> None:
+    panel = _live_time_panel()
+
+    assert panel.timeline == "stream_time"
+    assert panel.play_state == "following"
+    assert panel.state == "hidden"
+
+
+def test_constructor_disconnects_recording_after_partial_setup_failure() -> None:
+    recording = BlueprintFailureRecording()
+
+    with pytest.raises(RuntimeError, match="synthetic blueprint failure"):
+        RerunBridge(recording_factory=lambda _: recording)  # type: ignore[arg-type]
+
+    assert recording.disconnected is True
+
+
+def test_fast_replay_trajectory_sampling_uses_source_time() -> None:
+    recording = FakeRecording()
+    bridge = RerunBridge(recording_factory=lambda _: recording)  # type: ignore[arg-type]
+    base_time_ns = 1_784_124_315_000_000_000
+
+    for index in range(4):
+        pose_payload = struct.pack(
+            "<ffffffff",
+            index * 0.1,
+            2.0,
+            3.0,
+            99.0,
+            0.9,
+            0.1,
+            0.2,
+            0.3,
+        )
+        bridge.process(
+            _envelope(
+                "RealtimePath",
+                pose_payload,
+                sequence=index + 1,
+                received_at_epoch_ns=base_time_ns + index * 600_000_000,
+            )
+        )
+
+    assert bridge.metrics.snapshot()["trajectory_poses"] == 4
+    bridge.close()
 
 
 def test_bad_frame_is_rejected_before_rerun_without_publishing() -> None:
@@ -134,34 +217,7 @@ def test_palettes_are_deterministic_and_custom_color_is_exact() -> None:
     assert custom.tolist() == [[16, 32, 48], [16, 32, 48]]
 
 
-def test_real_grpc_server_releases_its_port() -> None:
-    probe = socket.socket()
-    probe.bind(("127.0.0.1", 0))
-    port = int(probe.getsockname()[1])
-    probe.close()
-
-    bridge = RerunBridge(
-        grpc_port=port,
-        cors_allow_origin=("http://127.0.0.1:8000",),
-    )
-    assert bridge.grpc_url == f"rerun+http://127.0.0.1:{port}/proxy"
-    bridge.close()
-
-    deadline = time.monotonic() + 2.0
-    while True:
-        available = socket.socket()
-        try:
-            available.bind(("127.0.0.1", port))
-            break
-        except OSError:
-            if time.monotonic() >= deadline:
-                raise
-            time.sleep(0.02)
-        finally:
-            available.close()
-
-
-def test_runtime_exposes_rerun_url_and_stops_cleanly(tmp_path: Path) -> None:
+def test_runtime_reuses_one_bridge_across_sequential_sessions(tmp_path: Path) -> None:
     capture = tmp_path / "mqtt.raw.k1mqtt"
     point_topic = "RealtimePointcloud"
     pose_topic = "RealtimePath"
@@ -237,11 +293,63 @@ def test_runtime_exposes_rerun_url_and_stops_cleanly(tmp_path: Path) -> None:
 
     assert len(created) == 1
     assert runtime.snapshot()["metrics"]["pcl_frames"] == 1
+    assert runtime.snapshot()["rerun_grpc_url"] == "rerun+http://127.0.0.1:9876/proxy"
+    assert recording.disconnected is False
     runtime.close()
     assert runtime.snapshot()["rerun_grpc_url"] is None
     assert recording.disconnected is True
 
 
+def test_runtime_reports_bridge_close_failure_instead_of_false_idle(tmp_path: Path) -> None:
+    capture = tmp_path / "mqtt.raw.k1mqtt"
+    topic = b"RealtimePointcloud"
+    payload = struct.pack("<III", 16, 0, 0) + struct.pack(
+        "<fffBBBB", 1.0, -2.0, 3.0, 10, 20, 30, 40
+    )
+    capture.write_bytes(RAW_MAGIC + FRAME_HEADER.pack(len(topic), len(payload)) + topic + payload)
+    (tmp_path / "mqtt.metadata.jsonl").write_text(
+        json.dumps(
+            {
+                "record_type": "message",
+                "sequence": 1,
+                "received_at_epoch_ns": 1_000_000_000,
+                "received_monotonic_ns": 1_000_000_000,
+            }
+        )
+        + "\n",
+        encoding="utf-8",
+    )
+    recording = DisconnectFailureRecording()
+
+    runtime = VisualizationRuntime(
+        bridge_factory=lambda **kwargs: RerunBridge(
+            recording_factory=lambda _: recording,  # type: ignore[arg-type]
+            **kwargs,  # type: ignore[arg-type]
+        ),
+        normalizer=normalize_k1_message,
+    )
+    runtime.start_replay(capture, speed=0.0)
+
+    deadline = time.monotonic() + 5.0
+    snapshot = runtime.snapshot()
+    while snapshot["phase"] not in {"idle", "error"} and time.monotonic() < deadline:
+        time.sleep(0.01)
+        snapshot = runtime.snapshot()
+
+    assert snapshot["phase"] == "idle"
+    assert snapshot["rerun_grpc_url"] == "rerun+http://127.0.0.1:9876/proxy"
+    assert recording.disconnected is False
+
+    with pytest.raises(RuntimeError, match="synthetic disconnect failure"):
+        runtime.close()
+
+    snapshot = runtime.snapshot()
+    assert snapshot["phase"] == "error"
+    assert "synthetic disconnect failure" in snapshot["message"]
+    assert snapshot["rerun_grpc_url"] is None
+    assert recording.disconnected is True
+
+
 def test_close_during_blocked_factory_closes_the_late_bridge(tmp_path: Path) -> None:
     capture = tmp_path / "mqtt.raw.k1mqtt"
     topic = b"RealtimePointcloud"
diff --git a/tests/test_xgrids_acquisition_lifecycle.py b/tests/test_xgrids_acquisition_lifecycle.py
index a950dd6..ae5566c 100644
--- a/tests/test_xgrids_acquisition_lifecycle.py
+++ b/tests/test_xgrids_acquisition_lifecycle.py
@@ -664,18 +664,22 @@ def test_provisioning_cannot_switch_device_during_active_acquisition(
     assert called is False
 
 
-def test_sensor_catalog_exposes_observed_camera_only_after_profile_attestation(
+def test_sensor_catalog_exposes_two_browser_adapter_cameras_after_profile_attestation(
     tmp_path: Path,
 ) -> None:
     service, _ = service_with_fake_runtime(tmp_path)
 
     initial = service.state()
-    initial_camera = next(
+    initial_cameras = [
         stream
         for stream in initial["sensor_catalog"]["streams"]
-        if stream["stream_id"] == "camera.preview.live"
-    )
-    assert initial_camera["availability"] == "unverified"
+        if stream.get("semantic_channel_id") == "camera.preview.live"
+    ]
+    assert {stream["source_id"] for stream in initial_cameras} == {
+        "sensor.camera.left",
+        "sensor.camera.right",
+    }
+    assert all(stream["availability"] == "unverified" for stream in initial_cameras)
 
     state = service.prepare_acquisition(
         PrepareAcquisitionRequest(
@@ -683,15 +687,21 @@ def test_sensor_catalog_exposes_observed_camera_only_after_profile_attestation(
             compatibility_attestation=ATTESTATION,
         )
     )
-    camera = next(
+    cameras = [
         stream
         for stream in state["sensor_catalog"]["streams"]
-        if stream["stream_id"] == "camera.preview.live"
-    )
+        if stream.get("semantic_channel_id") == "camera.preview.live"
+    ]
 
-    assert camera["availability"] == "observed"
-    assert camera["modality"] == "encoded-video"
-    assert camera["decode_status"] == "transport-observed-runtime-adapter-pending"
+    assert len(cameras) == 2
+    assert all(camera["availability"] == "available" for camera in cameras)
+    assert all(camera["modality"] == "encoded-video" for camera in cameras)
+    assert all(
+        camera["decode_status"] == "rtsp-h264-observed-browser-remux"
+        for camera in cameras
+    )
+    assert all(camera["activation"]["max_active"] == 1 for camera in cameras)
+    assert all(camera["delivery"] is None for camera in cameras)
     assert state["connection_verification"]["network_reachability"] == "unknown"
     assert state["device_calibration"]["status"] == "unavailable"
     assert state["device_calibration"]["vehicle_extrinsics"] == ("host-domain-not-owned-by-plugin")
diff --git a/tests/test_xgrids_camera_gateway.py b/tests/test_xgrids_camera_gateway.py
new file mode 100644
index 0000000..d9579cb
--- /dev/null
+++ b/tests/test_xgrids_camera_gateway.py
@@ -0,0 +1,205 @@
+from __future__ import annotations
+
+import json
+import sys
+from io import BytesIO
+from pathlib import Path
+
+import pytest
+
+from k1link.web.xgrids_k1_camera import (
+    CAMERA_MEDIA_TYPE,
+    XgridsK1CameraGateway,
+    _build_ffmpeg_argv,
+    _read_mp4_box,
+)
+from k1link.web.xgrids_k1_facade import (
+    XGRIDS_K1_COMPATIBILITY_PROFILE_ID,
+    XGRIDS_K1_PLUGIN_ID,
+    CameraPreviewSelectRequest,
+    CameraPreviewStopRequest,
+    XgridsK1CompatibilityService,
+)
+
+
+def _fake_ffmpeg(tmp_path: Path) -> Path:
+    executable = tmp_path / "fake-ffmpeg"
+    executable.write_text(
+        f"#!{sys.executable}\n"
+        "import sys, time\n"
+        "def box(kind, payload=b''):\n"
+        "    return (8 + len(payload)).to_bytes(4, 'big') + kind + payload\n"
+        "payload = (box(b'ftyp', b'isom') + box(b'moov') + "
+        "box(b'moof') + box(b'mdat', b'frame'))\n"
+        "sys.stdout.buffer.write(payload)\n"
+        "sys.stdout.buffer.flush()\n"
+        "time.sleep(10)\n",
+        encoding="utf-8",
+    )
+    executable.chmod(0o700)
+    return executable
+
+
+def _gateway(
+    tmp_path: Path,
+    monkeypatch: pytest.MonkeyPatch,
+) -> XgridsK1CameraGateway:
+    monkeypatch.setenv("MISSIONCORE_FFMPEG_BINARY", str(_fake_ffmpeg(tmp_path)))
+    return XgridsK1CameraGateway(tmp_path, XGRIDS_K1_PLUGIN_ID)
+
+
+def test_camera_selection_is_exclusive_and_hides_device_transport(
+    tmp_path: Path,
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    gateway = _gateway(tmp_path, monkeypatch)
+    try:
+        left = gateway.select("sensor.camera.left", "192.168.8.52")
+        assert left["active_source_id"] == "sensor.camera.left"
+        assert left["generation"] == 1
+        assert left["activation"]["max_active"] == 1
+        assert left["delivery"]["kind"] == "mse-fmp4-websocket"
+        assert left["delivery"]["media_type"] == CAMERA_MEDIA_TYPE
+
+        serialized = json.dumps(left)
+        assert "192.168.8.52" not in serialized
+        assert "rtsp://" not in serialized
+        assert "chn_left_main" not in serialized
+
+        right = gateway.select("sensor.camera.right", "192.168.8.52")
+        assert right["active_source_id"] == "sensor.camera.right"
+        assert right["generation"] == 2
+        assert right["delivery"]["url"].endswith("/camera-preview/2")
+
+        with pytest.raises(ValueError, match="generation"):
+            gateway.stop(1)
+        assert gateway.snapshot()["active_source_id"] == "sensor.camera.right"
+
+        stopped = gateway.stop(2)
+        assert stopped["phase"] == "idle"
+        assert stopped["delivery"] is None
+    finally:
+        gateway.close()
+
+
+def test_camera_ffmpeg_command_is_allowlisted_copy_remux() -> None:
+    argv = _build_ffmpeg_argv(
+        Path("/trusted/ffmpeg"),
+        "10.0.0.24",
+        "sensor.camera.left",
+    )
+
+    assert argv[0] == "/trusted/ffmpeg"
+    assert argv[argv.index("-i") + 1] == (
+        "rtsp://10.0.0.24:8554/live/chn_left_main"
+    )
+    assert argv[argv.index("-c:v") + 1] == "copy"
+    assert argv[argv.index("-allowed_media_types") + 1] == "video"
+    assert argv[argv.index("-flush_packets") + 1] == "1"
+    assert "-c:v" in argv
+    assert ";" not in " ".join(argv)
+
+    with pytest.raises(ValueError, match="private IPv4"):
+        _build_ffmpeg_argv(
+            Path("/trusted/ffmpeg"),
+            "example.com",
+            "sensor.camera.left",
+        )
+
+
+def test_iso_bmff_reader_preserves_complete_boxes() -> None:
+    def box(kind: bytes, payload: bytes = b"") -> bytes:
+        return (8 + len(payload)).to_bytes(4, "big") + kind + payload
+
+    stream = BytesIO(box(b"ftyp", b"isom") + box(b"moov") + box(b"moof"))
+    assert _read_mp4_box(stream) == (b"ftyp", box(b"ftyp", b"isom"))
+    assert _read_mp4_box(stream) == (b"moov", box(b"moov"))
+    assert _read_mp4_box(stream) == (b"moof", box(b"moof"))
+
+    oversized = (9 * 1024 * 1024).to_bytes(4, "big") + b"mdat"
+    with pytest.raises(ValueError, match="unbounded"):
+        _read_mp4_box(BytesIO(oversized))
+
+
+def test_gateway_emits_init_and_complete_media_segments_without_transcoding(
+    tmp_path: Path,
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    gateway = _gateway(tmp_path, monkeypatch)
+    try:
+        state = gateway.select("sensor.camera.right", "192.168.1.20")
+        lease = gateway.open_delivery(state["generation"])
+        init_segment = lease.segments.get(timeout=3)
+        media_segment = lease.segments.get(timeout=3)
+
+        assert init_segment is not None and init_segment[0] == "init"
+        assert b"ftyp" in init_segment[1] and b"moov" in init_segment[1]
+        assert media_segment is not None and media_segment[0] == "media"
+        assert b"moof" in media_segment[1] and b"mdat" in media_segment[1]
+
+        gateway.mark_streaming(lease)
+        assert gateway.snapshot()["phase"] == "streaming"
+        gateway.release_delivery(lease, client_closed=True)
+        assert gateway.snapshot()["phase"] == "selected"
+    finally:
+        gateway.close()
+
+
+def test_service_publishes_two_dynamic_camera_rows_and_stale_stop_is_safe(
+    tmp_path: Path,
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    monkeypatch.setenv("MISSIONCORE_FFMPEG_BINARY", str(_fake_ffmpeg(tmp_path)))
+    service = XgridsK1CompatibilityService(tmp_path)
+    try:
+        with service._lock:
+            service._k1_ip = "192.168.1.20"
+            service._device_id = "device-k1-test"
+            service._device_session_id = "device-session-test"
+            service._device_session_opened_at = "2026-07-16T20:00:00Z"
+            service._compatibility_attestation = {
+                "firmware_version": "3.0.2",
+                "topology": "direct-lan",
+                "basis": "operator-attested",
+                "observed_at": "2026-07-16T20:00:00Z",
+            }
+
+        state = service.select_camera_preview(
+            CameraPreviewSelectRequest(
+                source_id="sensor.camera.left",
+                device_session_id="device-session-test",
+            )
+        )
+        cameras = [
+            stream
+            for stream in state["sensor_catalog"]["streams"]
+            if stream.get("semantic_channel_id") == "camera.preview.live"
+        ]
+        assert len(cameras) == 2
+        assert sum(bool(stream["activation"]["selected"]) for stream in cameras) == 1
+        assert sum(stream["delivery"] is not None for stream in cameras) == 1
+        assert state["compatibility"]["profile_id"] == XGRIDS_K1_COMPATIBILITY_PROFILE_ID
+        camera_contract = json.dumps(
+            {"camera_preview": state["camera_preview"], "streams": cameras}
+        )
+        assert "rtsp://" not in camera_contract
+        assert "192.168.1.20" not in camera_contract
+
+        generation = state["camera_preview"]["generation"]
+        stopped = service.stop_camera_preview(
+            CameraPreviewStopRequest(
+                device_session_id="device-session-test",
+                generation=generation,
+            )
+        )
+        assert stopped["camera_preview"]["phase"] == "idle"
+
+        with pytest.raises(ValueError, match="device-сессия"):
+            service.select_camera_preview(
+                CameraPreviewSelectRequest(
+                    source_id="sensor.camera.right",
+                    device_session_id="stale-session",
+                )
+            )
+    finally:
+        service.close()