Fix Windows YouTube playback flow and overlay pointer tracking

changes/fix-overlay-pointer-tracking.md

@@ -0,0 +1,4 @@
+type: fixed
+area: overlay
+
+- Fixed overlay pointer tracking so Windows click-through toggles immediately when the cursor enters or leaves subtitle regions, without waiting for a later hover resync.

changes/fix-windows-youtube-playback.md

@@ -0,0 +1,5 @@
+type: fixed
+area: launcher
+
+- Fixed Windows direct `--youtube-play` startup so MPV boots reliably, stays paused until the app-owned subtitle flow is ready, and reuses an already-running SubMiner instance when available.
+- Fixed standalone Windows `--youtube-play` sessions so closing MPV fully exits SubMiner instead of leaving hidden overlay windows or a background process behind.

src/core/services/cli-command.test.ts

@@ -246,6 +246,23 @@ test('handleCliCommand defaults youtube mode to download when omitted', () => {
   ]);
 });
 
+test('handleCliCommand reuses initialized overlay runtime for second-instance youtube playback', () => {
+  const { deps, calls } = createDeps({
+    isOverlayRuntimeInitialized: () => true,
+    runYoutubePlaybackFlow: async (request) => {
+      calls.push(`youtube:${request.url}:${request.mode}:${request.source}`);
+    },
+  });
+
+  handleCliCommand(
+    makeArgs({ youtubePlay: 'https://youtube.com/watch?v=abc', youtubeMode: 'download' }),
+    'second-instance',
+    deps,
+  );
+
+  assert.deepEqual(calls, ['youtube:https://youtube.com/watch?v=abc:download:second-instance']);
+});
+
 test('handleCliCommand reports youtube playback flow failures to logs and OSD', async () => {
   const { deps, calls, osd } = createDeps({
     runYoutubePlaybackFlow: async () => {

src/core/services/youtube/playback-resolve.test.ts

@@ -0,0 +1,67 @@
+import assert from 'node:assert/strict';
+import fs from 'node:fs';
+import os from 'node:os';
+import path from 'node:path';
+import test from 'node:test';
+import { resolveYoutubePlaybackUrl } from './playback-resolve';
+
+async function withTempDir<T>(fn: (dir: string) => Promise<T>): Promise<T> {
+  const dir = fs.mkdtempSync(path.join(os.tmpdir(), 'subminer-youtube-playback-resolve-'));
+  try {
+    return await fn(dir);
+  } finally {
+    fs.rmSync(dir, { recursive: true, force: true });
+  }
+}
+
+function makeFakeYtDlpScript(dir: string, payload: string): void {
+  const scriptPath = path.join(dir, 'yt-dlp');
+  const script = `#!/usr/bin/env node
+process.stdout.write(${JSON.stringify(payload)});
+`;
+  fs.writeFileSync(scriptPath, script, 'utf8');
+  if (process.platform !== 'win32') {
+    fs.chmodSync(scriptPath, 0o755);
+  }
+  fs.writeFileSync(scriptPath + '.cmd', `@echo off\r\nnode "${scriptPath}"\r\n`, 'utf8');
+}
+
+async function withFakeYtDlp<T>(payload: string, fn: () => Promise<T>): Promise<T> {
+  return await withTempDir(async (root) => {
+    const binDir = path.join(root, 'bin');
+    fs.mkdirSync(binDir, { recursive: true });
+    makeFakeYtDlpScript(binDir, payload);
+    const fakeCommandPath =
+      process.platform === 'win32' ? path.join(binDir, 'yt-dlp.cmd') : path.join(binDir, 'yt-dlp');
+    const originalCommand = process.env.SUBMINER_YTDLP_BIN;
+    process.env.SUBMINER_YTDLP_BIN = fakeCommandPath;
+    try {
+      return await fn();
+    } finally {
+      if (originalCommand === undefined) {
+        delete process.env.SUBMINER_YTDLP_BIN;
+      } else {
+        process.env.SUBMINER_YTDLP_BIN = originalCommand;
+      }
+    }
+  });
+}
+
+test('resolveYoutubePlaybackUrl returns the first playable URL line', async () => {
+  await withFakeYtDlp(
+    '\nhttps://manifest.googlevideo.com/api/manifest/hls_playlist/test\nhttps://ignored.example/video\n',
+    async () => {
+      const result = await resolveYoutubePlaybackUrl('https://www.youtube.com/watch?v=abc123');
+      assert.equal(result, 'https://manifest.googlevideo.com/api/manifest/hls_playlist/test');
+    },
+  );
+});
+
+test('resolveYoutubePlaybackUrl rejects when yt-dlp returns no URL', async () => {
+  await withFakeYtDlp('\n', async () => {
+    await assert.rejects(
+      resolveYoutubePlaybackUrl('https://www.youtube.com/watch?v=abc123'),
+      /returned empty output/,
+    );
+  });
+});

src/core/services/youtube/playback-resolve.ts

@@ -0,0 +1,63 @@
+import { spawn } from 'node:child_process';
+
+const YOUTUBE_PLAYBACK_RESOLVE_TIMEOUT_MS = 15_000;
+const DEFAULT_PLAYBACK_FORMAT = 'b';
+
+function runCapture(
+  command: string,
+  args: string[],
+  timeoutMs = YOUTUBE_PLAYBACK_RESOLVE_TIMEOUT_MS,
+): Promise<{ stdout: string; stderr: string }> {
+  return new Promise((resolve, reject) => {
+    const proc = spawn(command, args, { stdio: ['ignore', 'pipe', 'pipe'] });
+    let stdout = '';
+    let stderr = '';
+    const timer = setTimeout(() => {
+      proc.kill();
+      reject(new Error(`yt-dlp timed out after ${timeoutMs}ms`));
+    }, timeoutMs);
+    proc.stdout.setEncoding('utf8');
+    proc.stderr.setEncoding('utf8');
+    proc.stdout.on('data', (chunk) => {
+      stdout += String(chunk);
+    });
+    proc.stderr.on('data', (chunk) => {
+      stderr += String(chunk);
+    });
+    proc.once('error', (error) => {
+      clearTimeout(timer);
+      reject(error);
+    });
+    proc.once('close', (code) => {
+      clearTimeout(timer);
+      if (code === 0) {
+        resolve({ stdout, stderr });
+        return;
+      }
+      reject(new Error(stderr.trim() || `yt-dlp exited with status ${code ?? 'unknown'}`));
+    });
+  });
+}
+
+export async function resolveYoutubePlaybackUrl(
+  targetUrl: string,
+  format = DEFAULT_PLAYBACK_FORMAT,
+): Promise<string> {
+  const ytDlpCommand = process.env.SUBMINER_YTDLP_BIN?.trim() || 'yt-dlp';
+  const { stdout } = await runCapture(ytDlpCommand, [
+    '--get-url',
+    '--no-warnings',
+    '-f',
+    format,
+    targetUrl,
+  ]);
+  const playbackUrl =
+    stdout
+      .split(/\r?\n/)
+      .map((line) => line.trim())
+      .find((line) => line.length > 0) ?? '';
+  if (!playbackUrl) {
+    throw new Error('yt-dlp returned empty output while resolving YouTube playback URL');
+  }
+  return playbackUrl;
+}

src/main.ts

@@ -315,6 +315,7 @@ import {
   acquireYoutubeSubtitleTrack,
   acquireYoutubeSubtitleTracks,
 } from './core/services/youtube/generate';
+import { resolveYoutubePlaybackUrl } from './core/services/youtube/playback-resolve';
 import { retimeYoutubeSubtitle } from './core/services/youtube/retime';
 import { probeYoutubeTracks } from './core/services/youtube/track-probe';
 import { startStatsServer } from './core/services/stats-server';
@@ -346,6 +347,9 @@ import {
   resolveWindowsMpvShortcutPaths,
 } from './main/runtime/windows-mpv-shortcuts';
 import { createWindowsMpvLaunchDeps, launchWindowsMpv } from './main/runtime/windows-mpv-launch';
+import { createWaitForMpvConnectedHandler } from './main/runtime/jellyfin-remote-connection';
+import { createPrepareYoutubePlaybackInMpvHandler } from './main/runtime/youtube-playback-launch';
+import { shouldEnsureTrayOnStartupForInitialArgs } from './main/runtime/startup-tray-policy';
 import { createImmersionTrackerStartupHandler } from './main/runtime/immersion-startup';
 import { createBuildImmersionTrackerStartupMainDepsHandler } from './main/runtime/immersion-startup-main-deps';
 import {
@@ -496,12 +500,17 @@ let anilistUpdateInFlightState = createInitialAnilistUpdateInFlightState();
 const anilistAttemptedUpdateKeys = new Set<string>();
 let anilistCachedAccessToken: string | null = null;
 let jellyfinPlayQuitOnDisconnectArmed = false;
+let youtubePlayQuitOnDisconnectArmed = false;
 const JELLYFIN_LANG_PREF = 'ja,jp,jpn,japanese,en,eng,english,enUS,en-US';
 const JELLYFIN_TICKS_PER_SECOND = 10_000_000;
 const JELLYFIN_REMOTE_PROGRESS_INTERVAL_MS = 3000;
 const DISCORD_PRESENCE_APP_ID = '1475264834730856619';
 const JELLYFIN_MPV_CONNECT_TIMEOUT_MS = 3000;
 const JELLYFIN_MPV_AUTO_LAUNCH_TIMEOUT_MS = 20000;
+const YOUTUBE_MPV_CONNECT_TIMEOUT_MS = 3000;
+const YOUTUBE_MPV_AUTO_LAUNCH_TIMEOUT_MS = 10000;
+const YOUTUBE_MPV_YTDL_FORMAT = 'bestvideo*+bestaudio/best';
+const YOUTUBE_DIRECT_PLAYBACK_FORMAT = 'b';
 const MPV_JELLYFIN_DEFAULT_ARGS = [
   '--sub-auto=fuzzy',
   '--sub-file-paths=.;subs;subtitles',
@@ -940,6 +949,28 @@ const youtubeFlowRuntime = createYoutubeFlowRuntime({
   log: (message: string) => logger.info(message),
   getYoutubeOutputDir: () => path.join(os.homedir(), '.cache', 'subminer', 'youtube-subs'),
 });
+const prepareYoutubePlaybackInMpv = createPrepareYoutubePlaybackInMpvHandler({
+  requestPath: async () => {
+    const client = appState.mpvClient;
+    if (!client) return null;
+    const value = await client.requestProperty('path').catch(() => null);
+    return typeof value === 'string' ? value : null;
+  },
+  requestProperty: async (name) => {
+    const client = appState.mpvClient;
+    if (!client) return null;
+    return await client.requestProperty(name);
+  },
+  sendMpvCommand: (command) => {
+    sendMpvCommandRuntime(appState.mpvClient, command);
+  },
+  wait: (ms) => new Promise((resolve) => setTimeout(resolve, ms)),
+});
+const waitForYoutubeMpvConnected = createWaitForMpvConnectedHandler({
+  getMpvClient: () => appState.mpvClient,
+  now: () => Date.now(),
+  sleep: (delayMs) => new Promise((resolve) => setTimeout(resolve, delayMs)),
+});
 
 async function runYoutubePlaybackFlowMain(request: {
   url: string;
@@ -948,27 +979,66 @@ async function runYoutubePlaybackFlowMain(request: {
 }): Promise<void> {
   youtubePrimarySubtitleNotificationRuntime.setAppOwnedFlowInFlight(true);
   try {
+    let playbackUrl = request.url;
+    let launchedWindowsMpv = false;
+    if (process.platform === 'win32') {
+      try {
+        playbackUrl = await resolveYoutubePlaybackUrl(request.url, YOUTUBE_DIRECT_PLAYBACK_FORMAT);
+        logger.info('Resolved direct YouTube playback URL for Windows MPV startup.');
+      } catch (error) {
+        logger.warn(
+          `Failed to resolve direct YouTube playback URL; falling back to page URL: ${
+            error instanceof Error ? error.message : String(error)
+          }`,
+        );
+      }
+    }
     if (process.platform === 'win32' && !appState.mpvClient?.connected) {
       const launchResult = launchWindowsMpv(
-        [request.url],
+        [playbackUrl],
         createWindowsMpvLaunchDeps({
           showError: (title, content) => dialog.showErrorBox(title, content),
         }),
         [
           '--pause=yes',
+          '--ytdl=yes',
+          `--ytdl-format=${YOUTUBE_MPV_YTDL_FORMAT}`,
           '--sub-auto=no',
-          '--sid=no',
+          '--sub-file-paths=.;subs;subtitles',
-          '--secondary-sid=no',
+          '--sid=auto',
-          '--script-opts=subminer-auto_start_pause_until_ready=no',
+          '--secondary-sid=auto',
+          '--secondary-sub-visibility=no',
+          '--alang=ja,jp,jpn,japanese,en,eng,english,enus,en-us',
+          '--slang=ja,jp,jpn,japanese,en,eng,english,enus,en-us',
+          `--log-file=${DEFAULT_MPV_LOG_PATH}`,
           `--input-ipc-server=${appState.mpvSocketPath}`,
         ],
       );
+      launchedWindowsMpv = launchResult.ok;
+      if (launchResult.ok) {
+        logger.info(`Bootstrapping Windows mpv for YouTube playback via ${launchResult.mpvPath}`);
+      }
       if (!launchResult.ok) {
         logger.warn('Unable to bootstrap Windows mpv for YouTube playback.');
       }
     }
-    if (!appState.mpvClient?.connected) {
+    const connected = await waitForYoutubeMpvConnected(
-      appState.mpvClient?.connect();
+      launchedWindowsMpv ? YOUTUBE_MPV_AUTO_LAUNCH_TIMEOUT_MS : YOUTUBE_MPV_CONNECT_TIMEOUT_MS,
+    );
+    if (!connected) {
+      throw new Error(
+        launchedWindowsMpv
+          ? 'MPV not connected after auto-launch. Ensure mpv is installed and can open the requested YouTube URL.'
+          : 'MPV not connected. Start mpv with the SubMiner profile or retry after mpv finishes starting.',
+      );
+    }
+    youtubePlayQuitOnDisconnectArmed = false;
+    setTimeout(() => {
+      youtubePlayQuitOnDisconnectArmed = true;
+    }, 3000);
+    const mediaReady = await prepareYoutubePlaybackInMpv({ url: playbackUrl });
+    if (!mediaReady) {
+      logger.warn('Timed out waiting for mpv to load requested YouTube URL; continuing anyway.');
     }
     await youtubeFlowRuntime.runYoutubePlaybackFlow({
       url: request.url,
@@ -1281,6 +1351,10 @@ function maybeSignalPluginAutoplayReady(
   payload: SubtitleData,
   options?: { forceWhilePaused?: boolean },
 ): void {
+  if (youtubePrimarySubtitleNotificationRuntime.isAppOwnedFlowInFlight()) {
+    logger.debug('[autoplay-ready] suppressed while app-owned YouTube flow is active');
+    return;
+  }
   if (!payload.text.trim()) {
     return;
   }
@@ -2829,6 +2903,10 @@ const {
       annotationSubtitleWsService.stop();
     },
     stopTexthookerService: () => texthookerService.stop(),
+    getMainOverlayWindow: () => overlayManager.getMainWindow(),
+    clearMainOverlayWindow: () => overlayManager.setMainWindow(null),
+    getModalOverlayWindow: () => overlayManager.getModalWindow(),
+    clearModalOverlayWindow: () => overlayManager.setModalWindow(null),
     getYomitanParserWindow: () => appState.yomitanParserWindow,
     clearYomitanParserState: () => {
       appState.yomitanParserWindow = null;
@@ -3478,7 +3556,8 @@ function ensureOverlayStartupPrereqs(): void {
 const handleInitialArgsRuntimeHandler = createInitialArgsRuntimeHandler({
   getInitialArgs: () => appState.initialArgs,
   isBackgroundMode: () => appState.backgroundMode,
-  shouldEnsureTrayOnStartup: () => process.platform === 'win32',
+  shouldEnsureTrayOnStartup: () =>
+    shouldEnsureTrayOnStartupForInitialArgs(process.platform, appState.initialArgs),
   shouldRunHeadlessInitialCommand: (args) => isHeadlessInitialCommand(args),
   ensureTray: () => ensureTray(),
   isTexthookerOnlyMode: () => appState.texthookerOnlyMode,
@@ -3512,7 +3591,8 @@ const {
 >({
   bindMpvMainEventHandlersMainDeps: {
     appState,
-    getQuitOnDisconnectArmed: () => jellyfinPlayQuitOnDisconnectArmed,
+    getQuitOnDisconnectArmed: () =>
+      jellyfinPlayQuitOnDisconnectArmed || youtubePlayQuitOnDisconnectArmed,
     scheduleQuitCheck: (callback) => {
       setTimeout(callback, 500);
     },

src/main/runtime/app-lifecycle-actions.test.ts

@@ -16,6 +16,8 @@ test('on will quit cleanup handler runs all cleanup steps', () => {
     unregisterAllGlobalShortcuts: () => calls.push('unregister-shortcuts'),
     stopSubtitleWebsocket: () => calls.push('stop-ws'),
     stopTexthookerService: () => calls.push('stop-texthooker'),
+    destroyMainOverlayWindow: () => calls.push('destroy-main-overlay-window'),
+    destroyModalOverlayWindow: () => calls.push('destroy-modal-overlay-window'),
     destroyYomitanParserWindow: () => calls.push('destroy-yomitan-window'),
     clearYomitanParserState: () => calls.push('clear-yomitan-state'),
     stopWindowTracker: () => calls.push('stop-tracker'),
@@ -38,7 +40,7 @@ test('on will quit cleanup handler runs all cleanup steps', () => {
   });
 
   cleanup();
-  assert.equal(calls.length, 26);
+  assert.equal(calls.length, 28);
   assert.equal(calls[0], 'destroy-tray');
   assert.equal(calls[calls.length - 1], 'stop-discord-presence');
   assert.ok(calls.indexOf('flush-mpv-log') < calls.indexOf('destroy-socket'));

src/main/runtime/app-lifecycle-actions.ts

@@ -6,6 +6,8 @@ export function createOnWillQuitCleanupHandler(deps: {
   unregisterAllGlobalShortcuts: () => void;
   stopSubtitleWebsocket: () => void;
   stopTexthookerService: () => void;
+  destroyMainOverlayWindow: () => void;
+  destroyModalOverlayWindow: () => void;
   destroyYomitanParserWindow: () => void;
   clearYomitanParserState: () => void;
   stopWindowTracker: () => void;
@@ -34,6 +36,8 @@ export function createOnWillQuitCleanupHandler(deps: {
     deps.unregisterAllGlobalShortcuts();
     deps.stopSubtitleWebsocket();
     deps.stopTexthookerService();
+    deps.destroyMainOverlayWindow();
+    deps.destroyModalOverlayWindow();
     deps.destroyYomitanParserWindow();
     deps.clearYomitanParserState();
     deps.stopWindowTracker();

src/main/runtime/app-lifecycle-main-cleanup.test.ts

@@ -18,6 +18,16 @@ test('cleanup deps builder returns handlers that guard optional runtime objects'
     unregisterAllGlobalShortcuts: () => calls.push('unregister-shortcuts'),
     stopSubtitleWebsocket: () => calls.push('stop-ws'),
     stopTexthookerService: () => calls.push('stop-texthooker'),
+    getMainOverlayWindow: () => ({
+      isDestroyed: () => false,
+      destroy: () => calls.push('destroy-main-overlay-window'),
+    }),
+    clearMainOverlayWindow: () => calls.push('clear-main-overlay-window'),
+    getModalOverlayWindow: () => ({
+      isDestroyed: () => false,
+      destroy: () => calls.push('destroy-modal-overlay-window'),
+    }),
+    clearModalOverlayWindow: () => calls.push('clear-modal-overlay-window'),
 
     getYomitanParserWindow: () => ({
       isDestroyed: () => false,
@@ -61,6 +71,10 @@ test('cleanup deps builder returns handlers that guard optional runtime objects'
   cleanup();
 
   assert.ok(calls.includes('destroy-tray'));
+  assert.ok(calls.includes('destroy-main-overlay-window'));
+  assert.ok(calls.includes('clear-main-overlay-window'));
+  assert.ok(calls.includes('destroy-modal-overlay-window'));
+  assert.ok(calls.includes('clear-modal-overlay-window'));
   assert.ok(calls.includes('destroy-yomitan-window'));
   assert.ok(calls.includes('flush-mpv-log'));
   assert.ok(calls.includes('destroy-socket'));
@@ -85,6 +99,16 @@ test('cleanup deps builder skips destroyed yomitan window', () => {
     unregisterAllGlobalShortcuts: () => {},
     stopSubtitleWebsocket: () => {},
     stopTexthookerService: () => {},
+    getMainOverlayWindow: () => ({
+      isDestroyed: () => true,
+      destroy: () => calls.push('destroy-main-overlay-window'),
+    }),
+    clearMainOverlayWindow: () => calls.push('clear-main-overlay-window'),
+    getModalOverlayWindow: () => ({
+      isDestroyed: () => true,
+      destroy: () => calls.push('destroy-modal-overlay-window'),
+    }),
+    clearModalOverlayWindow: () => calls.push('clear-modal-overlay-window'),
     getYomitanParserWindow: () => ({
       isDestroyed: () => true,
       destroy: () => calls.push('destroy-yomitan-window'),

src/main/runtime/app-lifecycle-main-cleanup.ts

@@ -25,6 +25,10 @@ export function createBuildOnWillQuitCleanupDepsHandler(deps: {
   unregisterAllGlobalShortcuts: () => void;
   stopSubtitleWebsocket: () => void;
   stopTexthookerService: () => void;
+  getMainOverlayWindow: () => DestroyableWindow | null;
+  clearMainOverlayWindow: () => void;
+  getModalOverlayWindow: () => DestroyableWindow | null;
+  clearModalOverlayWindow: () => void;
 
   getYomitanParserWindow: () => DestroyableWindow | null;
   clearYomitanParserState: () => void;
@@ -60,6 +64,20 @@ export function createBuildOnWillQuitCleanupDepsHandler(deps: {
     unregisterAllGlobalShortcuts: () => deps.unregisterAllGlobalShortcuts(),
     stopSubtitleWebsocket: () => deps.stopSubtitleWebsocket(),
     stopTexthookerService: () => deps.stopTexthookerService(),
+    destroyMainOverlayWindow: () => {
+      const window = deps.getMainOverlayWindow();
+      if (!window) return;
+      if (window.isDestroyed()) return;
+      window.destroy();
+      deps.clearMainOverlayWindow();
+    },
+    destroyModalOverlayWindow: () => {
+      const window = deps.getModalOverlayWindow();
+      if (!window) return;
+      if (window.isDestroyed()) return;
+      window.destroy();
+      deps.clearModalOverlayWindow();
+    },
     destroyYomitanParserWindow: () => {
       const window = deps.getYomitanParserWindow();
       if (!window) return;

src/main/runtime/composers/startup-lifecycle-composer.test.ts

@@ -20,6 +20,10 @@ test('composeStartupLifecycleHandlers returns callable startup lifecycle handler
       unregisterAllGlobalShortcuts: () => {},
       stopSubtitleWebsocket: () => {},
       stopTexthookerService: () => {},
+      getMainOverlayWindow: () => null,
+      clearMainOverlayWindow: () => {},
+      getModalOverlayWindow: () => null,
+      clearModalOverlayWindow: () => {},
       getYomitanParserWindow: () => null,
       clearYomitanParserState: () => {},
       getWindowTracker: () => null,

src/main/runtime/mpv-client-event-bindings.test.ts

@@ -12,8 +12,9 @@ test('mpv connection handler reports stop and quits when disconnect guard passes
     reportJellyfinRemoteStopped: () => calls.push('report-stop'),
     refreshDiscordPresence: () => calls.push('presence-refresh'),
     syncOverlayMpvSubtitleSuppression: () => calls.push('sync-overlay-mpv-sub'),
-    hasInitialJellyfinPlayArg: () => true,
+    hasInitialPlaybackQuitOnDisconnectArg: () => true,
     isOverlayRuntimeInitialized: () => false,
+    shouldQuitOnDisconnectWhenOverlayRuntimeInitialized: () => false,
     isQuitOnDisconnectArmed: () => true,
     scheduleQuitCheck: (callback) => {
       calls.push('schedule');
@@ -36,8 +37,9 @@ test('mpv connection handler syncs overlay subtitle suppression on connect', ()
     refreshDiscordPresence: () => calls.push('presence-refresh'),
     syncOverlayMpvSubtitleSuppression: () => calls.push('sync-overlay-mpv-sub'),
     scheduleCharacterDictionarySync: () => calls.push('dict-sync'),
-    hasInitialJellyfinPlayArg: () => true,
+    hasInitialPlaybackQuitOnDisconnectArg: () => true,
     isOverlayRuntimeInitialized: () => false,
+    shouldQuitOnDisconnectWhenOverlayRuntimeInitialized: () => false,
     isQuitOnDisconnectArmed: () => true,
     scheduleQuitCheck: () => {
       calls.push('schedule');
@@ -52,6 +54,28 @@ test('mpv connection handler syncs overlay subtitle suppression on connect', ()
   assert.deepEqual(calls, ['presence-refresh', 'sync-overlay-mpv-sub']);
 });
 
+test('mpv connection handler quits standalone youtube playback even after overlay runtime init', () => {
+  const calls: string[] = [];
+  const handler = createHandleMpvConnectionChangeHandler({
+    reportJellyfinRemoteStopped: () => calls.push('report-stop'),
+    refreshDiscordPresence: () => calls.push('presence-refresh'),
+    syncOverlayMpvSubtitleSuppression: () => calls.push('sync-overlay-mpv-sub'),
+    hasInitialPlaybackQuitOnDisconnectArg: () => true,
+    isOverlayRuntimeInitialized: () => true,
+    shouldQuitOnDisconnectWhenOverlayRuntimeInitialized: () => true,
+    isQuitOnDisconnectArmed: () => true,
+    scheduleQuitCheck: (callback) => {
+      calls.push('schedule');
+      callback();
+    },
+    isMpvConnected: () => false,
+    quitApp: () => calls.push('quit'),
+  });
+
+  handler({ connected: false });
+  assert.deepEqual(calls, ['presence-refresh', 'report-stop', 'schedule', 'quit']);
+});
+
 test('mpv subtitle timing handler ignores blank subtitle lines', () => {
   const calls: string[] = [];
   const handler = createHandleMpvSubtitleTimingHandler({

src/main/runtime/mpv-client-event-bindings.ts

@@ -22,8 +22,9 @@ export function createHandleMpvConnectionChangeHandler(deps: {
   reportJellyfinRemoteStopped: () => void;
   refreshDiscordPresence: () => void;
   syncOverlayMpvSubtitleSuppression: () => void;
-  hasInitialJellyfinPlayArg: () => boolean;
+  hasInitialPlaybackQuitOnDisconnectArg: () => boolean;
   isOverlayRuntimeInitialized: () => boolean;
+  shouldQuitOnDisconnectWhenOverlayRuntimeInitialized: () => boolean;
   isQuitOnDisconnectArmed: () => boolean;
   scheduleQuitCheck: (callback: () => void) => void;
   isMpvConnected: () => boolean;
@@ -36,8 +37,13 @@ export function createHandleMpvConnectionChangeHandler(deps: {
       return;
     }
     deps.reportJellyfinRemoteStopped();
-    if (!deps.hasInitialJellyfinPlayArg()) return;
+    if (!deps.hasInitialPlaybackQuitOnDisconnectArg()) return;
-    if (deps.isOverlayRuntimeInitialized()) return;
+    if (
+      deps.isOverlayRuntimeInitialized() &&
+      !deps.shouldQuitOnDisconnectWhenOverlayRuntimeInitialized()
+    ) {
+      return;
+    }
     if (!deps.isQuitOnDisconnectArmed()) return;
     deps.scheduleQuitCheck(() => {
       if (deps.isMpvConnected()) return;

src/main/runtime/mpv-main-event-bindings.test.ts

@@ -10,8 +10,9 @@ test('main mpv event binder wires callbacks through to runtime deps', () => {
     reportJellyfinRemoteStopped: () => calls.push('remote-stopped'),
     syncOverlayMpvSubtitleSuppression: () => calls.push('sync-overlay-mpv-sub'),
     resetSubtitleSidebarEmbeddedLayout: () => calls.push('reset-sidebar-layout'),
-    hasInitialJellyfinPlayArg: () => false,
+    hasInitialPlaybackQuitOnDisconnectArg: () => false,
     isOverlayRuntimeInitialized: () => false,
+    shouldQuitOnDisconnectWhenOverlayRuntimeInitialized: () => false,
     isQuitOnDisconnectArmed: () => false,
     scheduleQuitCheck: () => {
       calls.push('schedule-quit-check');

src/main/runtime/mpv-main-event-bindings.ts

@@ -23,8 +23,9 @@ export function createBindMpvMainEventHandlersHandler(deps: {
   syncOverlayMpvSubtitleSuppression: () => void;
   resetSubtitleSidebarEmbeddedLayout: () => void;
   scheduleCharacterDictionarySync?: () => void;
-  hasInitialJellyfinPlayArg: () => boolean;
+  hasInitialPlaybackQuitOnDisconnectArg: () => boolean;
   isOverlayRuntimeInitialized: () => boolean;
+  shouldQuitOnDisconnectWhenOverlayRuntimeInitialized: () => boolean;
   isQuitOnDisconnectArmed: () => boolean;
   scheduleQuitCheck: (callback: () => void) => void;
   isMpvConnected: () => boolean;
@@ -77,8 +78,11 @@ export function createBindMpvMainEventHandlersHandler(deps: {
       reportJellyfinRemoteStopped: () => deps.reportJellyfinRemoteStopped(),
       refreshDiscordPresence: () => deps.refreshDiscordPresence(),
       syncOverlayMpvSubtitleSuppression: () => deps.syncOverlayMpvSubtitleSuppression(),
-      hasInitialJellyfinPlayArg: () => deps.hasInitialJellyfinPlayArg(),
+      hasInitialPlaybackQuitOnDisconnectArg: () =>
+        deps.hasInitialPlaybackQuitOnDisconnectArg(),
       isOverlayRuntimeInitialized: () => deps.isOverlayRuntimeInitialized(),
+      shouldQuitOnDisconnectWhenOverlayRuntimeInitialized: () =>
+        deps.shouldQuitOnDisconnectWhenOverlayRuntimeInitialized(),
       isQuitOnDisconnectArmed: () => deps.isQuitOnDisconnectArmed(),
       scheduleQuitCheck: (callback) => deps.scheduleQuitCheck(callback),
       isMpvConnected: () => deps.isMpvConnected(),

src/main/runtime/mpv-main-event-main-deps.test.ts

@@ -61,7 +61,7 @@ test('mpv main event main deps map app state updates and delegate callbacks', as
     refreshDiscordPresence: () => calls.push('presence-refresh'),
   })();
 
-  assert.equal(deps.hasInitialJellyfinPlayArg(), true);
+  assert.equal(deps.hasInitialPlaybackQuitOnDisconnectArg(), true);
   assert.equal(deps.isOverlayRuntimeInitialized(), true);
   assert.equal(deps.isQuitOnDisconnectArmed(), true);
   assert.equal(deps.isMpvConnected(), true);
@@ -158,3 +158,59 @@ test('mpv main event main deps wire subtitle callbacks without suppression gate'
   deps.setCurrentSubText('sub');
   assert.equal(typeof deps.setCurrentSubText, 'function');
 });
+
+test('flushPlaybackPositionOnMediaPathClear ignores disconnected mpv time-pos reads', async () => {
+  const recorded: number[] = [];
+  const deps = createBuildBindMpvMainEventHandlersMainDepsHandler({
+    appState: {
+      initialArgs: null,
+      overlayRuntimeInitialized: true,
+      mpvClient: {
+        connected: false,
+        currentTimePos: 42,
+        requestProperty: async () => {
+          throw new Error('disconnected');
+        },
+      },
+      immersionTracker: {
+        recordPlaybackPosition: (time: number) => {
+          recorded.push(time);
+        },
+      },
+      subtitleTimingTracker: null,
+      currentMediaPath: '',
+      currentSubText: '',
+      currentSubAssText: '',
+      playbackPaused: null,
+      previousSecondarySubVisibility: false,
+    },
+    getQuitOnDisconnectArmed: () => false,
+    scheduleQuitCheck: () => {},
+    quitApp: () => {},
+    reportJellyfinRemoteStopped: () => {},
+    syncOverlayMpvSubtitleSuppression: () => {},
+    maybeRunAnilistPostWatchUpdate: async () => {},
+    logSubtitleTimingError: () => {},
+    broadcastToOverlayWindows: () => {},
+    onSubtitleChange: () => {},
+    ensureImmersionTrackerInitialized: () => {},
+    updateCurrentMediaPath: () => {},
+    restoreMpvSubVisibility: () => {},
+    resetSubtitleSidebarEmbeddedLayout: () => {},
+    getCurrentAnilistMediaKey: () => null,
+    resetAnilistMediaTracking: () => {},
+    maybeProbeAnilistDuration: () => {},
+    ensureAnilistMediaGuess: () => {},
+    syncImmersionMediaState: () => {},
+    updateCurrentMediaTitle: () => {},
+    resetAnilistMediaGuessState: () => {},
+    reportJellyfinRemoteProgress: () => {},
+    updateSubtitleRenderMetrics: () => {},
+    refreshDiscordPresence: () => {},
+  })();
+
+  deps.flushPlaybackPositionOnMediaPathClear?.('');
+  await Promise.resolve();
+
+  assert.deepEqual(recorded, [42]);
+});

src/main/runtime/mpv-main-event-main-deps.ts

@@ -2,7 +2,7 @@ import type { MergedToken, SubtitleData } from '../../types';
 
 export function createBuildBindMpvMainEventHandlersMainDepsHandler(deps: {
   appState: {
-    initialArgs?: { jellyfinPlay?: unknown } | null;
+    initialArgs?: { jellyfinPlay?: unknown; youtubePlay?: unknown } | null;
     overlayRuntimeInitialized: boolean;
     mpvClient:
       | {
@@ -79,8 +79,11 @@ export function createBuildBindMpvMainEventHandlersMainDepsHandler(deps: {
   return () => ({
     reportJellyfinRemoteStopped: () => deps.reportJellyfinRemoteStopped(),
     syncOverlayMpvSubtitleSuppression: () => deps.syncOverlayMpvSubtitleSuppression(),
-    hasInitialJellyfinPlayArg: () => Boolean(deps.appState.initialArgs?.jellyfinPlay),
+    hasInitialPlaybackQuitOnDisconnectArg: () =>
+      Boolean(deps.appState.initialArgs?.jellyfinPlay || deps.appState.initialArgs?.youtubePlay),
     isOverlayRuntimeInitialized: () => deps.appState.overlayRuntimeInitialized,
+    shouldQuitOnDisconnectWhenOverlayRuntimeInitialized: () =>
+      Boolean(deps.appState.initialArgs?.youtubePlay),
     isQuitOnDisconnectArmed: () => deps.getQuitOnDisconnectArmed(),
     scheduleQuitCheck: (callback: () => void) => deps.scheduleQuitCheck(callback),
     isMpvConnected: () => Boolean(deps.appState.mpvClient?.connected),
@@ -187,16 +190,25 @@ export function createBuildBindMpvMainEventHandlersMainDepsHandler(deps: {
       if (!mpvClient?.requestProperty) {
         return;
       }
-      void mpvClient.requestProperty('time-pos').then((timePos) => {
+      void mpvClient
+        .requestProperty('time-pos')
+        .then((timePos) => {
           const currentPath = (deps.appState.currentMediaPath ?? '').trim();
           if (currentPath.length > 0 && currentPath !== mediaPath) {
             return;
           }
           const resolvedTime = Number(timePos);
-        if (Number.isFinite(currentKnownTime) && Number.isFinite(resolvedTime) && currentKnownTime === resolvedTime) {
+          if (
+            Number.isFinite(currentKnownTime) &&
+            Number.isFinite(resolvedTime) &&
+            currentKnownTime === resolvedTime
+          ) {
             return;
           }
           writePlaybackPositionFromMpv(resolvedTime);
+        })
+        .catch(() => {
+          // mpv can disconnect while clearing media; keep the last cached position.
         });
     },
     updateSubtitleRenderMetrics: (patch: Record<string, unknown>) =>

src/main/runtime/startup-tray-policy.test.ts

@@ -0,0 +1,20 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import { shouldEnsureTrayOnStartupForInitialArgs } from './startup-tray-policy';
+
+test('startup tray policy enables tray on Windows by default', () => {
+  assert.equal(shouldEnsureTrayOnStartupForInitialArgs('win32', null), true);
+});
+
+test('startup tray policy skips tray for direct youtube playback on Windows', () => {
+  assert.equal(
+    shouldEnsureTrayOnStartupForInitialArgs('win32', {
+      youtubePlay: 'https://www.youtube.com/watch?v=abc',
+    } as never),
+    false,
+  );
+});
+
+test('startup tray policy skips tray outside Windows', () => {
+  assert.equal(shouldEnsureTrayOnStartupForInitialArgs('linux', null), false);
+});

src/main/runtime/startup-tray-policy.ts

@@ -0,0 +1,14 @@
+import type { CliArgs } from '../../cli/args';
+
+export function shouldEnsureTrayOnStartupForInitialArgs(
+  platform: NodeJS.Platform,
+  initialArgs: CliArgs | null,
+): boolean {
+  if (platform !== 'win32') {
+    return false;
+  }
+  if (initialArgs?.youtubePlay) {
+    return false;
+  }
+  return true;
+}

src/main/runtime/youtube-flow.test.ts

@@ -378,6 +378,73 @@ test('youtube flow does not report failure when subtitle track binds before cue
   assert.deepEqual(failures, []);
 });
 
+test('youtube flow does not fail when mpv reports sub-text as unavailable after track bind', async () => {
+  const failures: string[] = [];
+
+  const runtime = createYoutubeFlowRuntime({
+    probeYoutubeTracks: async () => ({
+      videoId: 'video123',
+      title: 'Video 123',
+      tracks: [primaryTrack],
+    }),
+    acquireYoutubeSubtitleTracks: async () => new Map(),
+    acquireYoutubeSubtitleTrack: async () => ({ path: '/tmp/auto-ja-orig.vtt' }),
+    retimeYoutubePrimaryTrack: async ({ primaryPath }) => primaryPath,
+    openPicker: async (payload) => {
+      queueMicrotask(() => {
+        void runtime.resolveActivePicker({
+          sessionId: payload.sessionId,
+          action: 'use-selected',
+          primaryTrackId: primaryTrack.id,
+          secondaryTrackId: null,
+        });
+      });
+      return true;
+    },
+    pauseMpv: () => {},
+    resumeMpv: () => {},
+    sendMpvCommand: () => {},
+    requestMpvProperty: async (name) => {
+      if (name === 'sub-text') {
+        throw new Error("Failed to read MPV property 'sub-text': property unavailable");
+      }
+      return [
+        {
+          type: 'sub',
+          id: 5,
+          lang: 'ja-orig',
+          title: 'primary',
+          external: true,
+          'external-filename': '/tmp/auto-ja-orig.vtt',
+        },
+      ];
+    },
+    refreshCurrentSubtitle: () => {
+      throw new Error('should not refresh when sub-text is unavailable');
+    },
+    startTokenizationWarmups: async () => {},
+    waitForTokenizationReady: async () => {},
+    waitForAnkiReady: async () => {},
+    wait: async () => {},
+    waitForPlaybackWindowReady: async () => {},
+    waitForOverlayGeometryReady: async () => {},
+    focusOverlayWindow: () => {},
+    showMpvOsd: () => {},
+    reportSubtitleFailure: (message) => {
+      failures.push(message);
+    },
+    warn: (message) => {
+      throw new Error(message);
+    },
+    log: () => {},
+    getYoutubeOutputDir: () => '/tmp',
+  });
+
+  await runtime.openManualPicker({ url: 'https://example.com' });
+
+  assert.deepEqual(failures, []);
+});
+
 test('youtube flow retries secondary subtitle selection until mpv reports the expected secondary sid', async () => {
   const commands: Array<Array<string | number>> = [];
   const waits: number[] = [];

src/main/runtime/youtube-flow.ts

@@ -417,7 +417,7 @@ async function injectDownloadedSubtitles(
     return false;
   }
 
-  const currentSubText = await deps.requestMpvProperty('sub-text');
+  const currentSubText = await deps.requestMpvProperty('sub-text').catch(() => null);
   if (typeof currentSubText === 'string' && currentSubText.trim().length > 0) {
     deps.refreshCurrentSubtitle(currentSubText);
   }

src/main/runtime/youtube-playback-launch.test.ts

@@ -0,0 +1,169 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import { createPrepareYoutubePlaybackInMpvHandler } from './youtube-playback-launch';
+
+function createWaitStub() {
+  return async (_ms: number): Promise<void> => {};
+}
+
+test('prepare youtube playback skips load when current path already matches exact URL', async () => {
+  const commands: Array<Array<string>> = [];
+  const prepare = createPrepareYoutubePlaybackInMpvHandler({
+    requestPath: async () => 'https://www.youtube.com/watch?v=abc123',
+    requestProperty: async () => [{ type: 'video', id: 1 }],
+    sendMpvCommand: (command) => commands.push(command),
+    wait: createWaitStub(),
+  });
+
+  const ok = await prepare({ url: 'https://www.youtube.com/watch?v=abc123' });
+
+  assert.equal(ok, true);
+  assert.deepEqual(commands, []);
+});
+
+test('prepare youtube playback treats matching video IDs as already loaded', async () => {
+  const commands: Array<Array<string>> = [];
+  const prepare = createPrepareYoutubePlaybackInMpvHandler({
+    requestPath: async () => 'https://youtu.be/abc123?t=5',
+    requestProperty: async () => [{ type: 'video', id: 1 }],
+    sendMpvCommand: (command) => commands.push(command),
+    wait: createWaitStub(),
+  });
+
+  const ok = await prepare({ url: 'https://www.youtube.com/watch?v=abc123' });
+
+  assert.equal(ok, true);
+  assert.deepEqual(commands, []);
+});
+
+test('prepare youtube playback replaces media and waits for path switch', async () => {
+  const commands: Array<Array<string>> = [];
+  const observedPaths = [
+    '/videos/episode01.mkv',
+    '/videos/episode01.mkv',
+    'https://www.youtube.com/watch?v=newvid',
+  ];
+  const observedTrackLists = [null, [], [{ type: 'video', id: 1 }]];
+  let requestCount = 0;
+  const prepare = createPrepareYoutubePlaybackInMpvHandler({
+    requestPath: async () => {
+      const value = observedPaths[Math.min(requestCount, observedPaths.length - 1)] ?? null;
+      requestCount += 1;
+      return value;
+    },
+    requestProperty: async (name) => {
+      if (name !== 'track-list') return null;
+      return observedTrackLists[Math.min(requestCount - 1, observedTrackLists.length - 1)] ?? [];
+    },
+    sendMpvCommand: (command) => commands.push(command),
+    wait: createWaitStub(),
+  });
+
+  const ok = await prepare({
+    url: 'https://www.youtube.com/watch?v=newvid',
+    timeoutMs: 1500,
+    pollIntervalMs: 1,
+  });
+
+  assert.equal(ok, true);
+  assert.deepEqual(commands, [
+    ['set_property', 'pause', 'yes'],
+    ['set_property', 'sub-auto', 'no'],
+    ['set_property', 'sid', 'no'],
+    ['set_property', 'secondary-sid', 'no'],
+    ['loadfile', 'https://www.youtube.com/watch?v=newvid', 'replace'],
+  ]);
+});
+
+test('prepare youtube playback returns false after timeout when path never updates', async () => {
+  const commands: Array<Array<string>> = [];
+  let nowTick = 0;
+  const prepare = createPrepareYoutubePlaybackInMpvHandler({
+    requestPath: async () => '/videos/episode01.mkv',
+    requestProperty: async () => [],
+    sendMpvCommand: (command) => commands.push(command),
+    wait: createWaitStub(),
+    now: () => {
+      nowTick += 100;
+      return nowTick;
+    },
+  });
+
+  const ok = await prepare({
+    url: 'https://www.youtube.com/watch?v=never-switches',
+    timeoutMs: 350,
+    pollIntervalMs: 1,
+  });
+
+  assert.equal(ok, false);
+  assert.deepEqual(commands[4], [
+    'loadfile',
+    'https://www.youtube.com/watch?v=never-switches',
+    'replace',
+  ]);
+});
+
+test('prepare youtube playback waits for playable media tracks after youtube path matches', async () => {
+  const commands: Array<Array<string>> = [];
+  const observedPaths = [
+    '/videos/episode01.mkv',
+    'https://www.youtube.com/watch?v=newvid',
+    'https://www.youtube.com/watch?v=newvid',
+  ];
+  const observedTrackLists = [[], [], [{ type: 'audio', id: 1 }]];
+  let requestCount = 0;
+  const prepare = createPrepareYoutubePlaybackInMpvHandler({
+    requestPath: async () => {
+      const value = observedPaths[Math.min(requestCount, observedPaths.length - 1)] ?? null;
+      requestCount += 1;
+      return value;
+    },
+    requestProperty: async (name) => {
+      if (name !== 'track-list') return null;
+      return observedTrackLists[Math.min(requestCount - 1, observedTrackLists.length - 1)] ?? [];
+    },
+    sendMpvCommand: (command) => commands.push(command),
+    wait: createWaitStub(),
+  });
+
+  const ok = await prepare({
+    url: 'https://www.youtube.com/watch?v=newvid',
+    timeoutMs: 1500,
+    pollIntervalMs: 1,
+  });
+
+  assert.equal(ok, true);
+  assert.deepEqual(commands[4], ['loadfile', 'https://www.youtube.com/watch?v=newvid', 'replace']);
+});
+
+test('prepare youtube playback accepts a non-youtube resolved path once playable tracks exist', async () => {
+  const commands: Array<Array<string>> = [];
+  const observedPaths = [
+    '/videos/episode01.mkv',
+    'https://rr16---sn.example.googlevideo.com/videoplayback?id=abc',
+  ];
+  const observedTrackLists = [[], [{ type: 'video', id: 1 }, { type: 'audio', id: 2 }]];
+  let requestCount = 0;
+  const prepare = createPrepareYoutubePlaybackInMpvHandler({
+    requestPath: async () => {
+      const value = observedPaths[Math.min(requestCount, observedPaths.length - 1)] ?? null;
+      requestCount += 1;
+      return value;
+    },
+    requestProperty: async (name) => {
+      if (name !== 'track-list') return null;
+      return observedTrackLists[Math.min(requestCount - 1, observedTrackLists.length - 1)] ?? [];
+    },
+    sendMpvCommand: (command) => commands.push(command),
+    wait: createWaitStub(),
+  });
+
+  const ok = await prepare({
+    url: 'https://www.youtube.com/watch?v=newvid',
+    timeoutMs: 1500,
+    pollIntervalMs: 1,
+  });
+
+  assert.equal(ok, true);
+  assert.deepEqual(commands[4], ['loadfile', 'https://www.youtube.com/watch?v=newvid', 'replace']);
+});

src/main/runtime/youtube-playback-launch.ts

@@ -0,0 +1,153 @@
+import { isYoutubeMediaPath } from './youtube-playback';
+
+type YoutubePlaybackLaunchInput = {
+  url: string;
+  timeoutMs?: number;
+  pollIntervalMs?: number;
+};
+
+type YoutubePlaybackLaunchDeps = {
+  requestPath: () => Promise<string | null>;
+  requestProperty?: (name: string) => Promise<unknown>;
+  sendMpvCommand: (command: Array<string>) => void;
+  wait: (ms: number) => Promise<void>;
+  now?: () => number;
+};
+
+function normalizePath(value: string | null | undefined): string {
+  if (typeof value !== 'string') return '';
+  return value.trim();
+}
+
+function extractYoutubeVideoId(url: string): string | null {
+  let parsed: URL;
+  try {
+    parsed = new URL(url);
+  } catch {
+    return null;
+  }
+
+  const host = parsed.hostname.toLowerCase();
+  const path = parsed.pathname.replace(/^\/+/, '');
+
+  if (host === 'youtu.be' || host.endsWith('.youtu.be')) {
+    const id = path.split('/')[0]?.trim() || '';
+    return id || null;
+  }
+
+  const youtubeHost =
+    host === 'youtube.com' ||
+    host.endsWith('.youtube.com') ||
+    host === 'youtube-nocookie.com' ||
+    host.endsWith('.youtube-nocookie.com');
+  if (!youtubeHost) {
+    return null;
+  }
+
+  if (parsed.pathname === '/watch') {
+    const id = parsed.searchParams.get('v')?.trim() || '';
+    return id || null;
+  }
+
+  if (path.startsWith('shorts/') || path.startsWith('embed/')) {
+    const id = path.split('/')[1]?.trim() || '';
+    return id || null;
+  }
+
+  return null;
+}
+
+function targetsSameYoutubeVideo(currentPath: string, targetUrl: string): boolean {
+  const currentId = extractYoutubeVideoId(currentPath);
+  const targetId = extractYoutubeVideoId(targetUrl);
+  if (!currentId || !targetId) return false;
+  return currentId === targetId;
+}
+
+function pathMatchesYoutubeTarget(currentPath: string, targetUrl: string): boolean {
+  if (!currentPath) return false;
+  if (currentPath === targetUrl) return true;
+  return targetsSameYoutubeVideo(currentPath, targetUrl);
+}
+
+function hasPlayableMediaTracks(trackListRaw: unknown): boolean {
+  if (!Array.isArray(trackListRaw)) return false;
+  return trackListRaw.some((track) => {
+    if (!track || typeof track !== 'object') return false;
+    const type = String((track as Record<string, unknown>).type || '').trim().toLowerCase();
+    return type === 'video' || type === 'audio';
+  });
+}
+
+export function createPrepareYoutubePlaybackInMpvHandler(deps: YoutubePlaybackLaunchDeps) {
+  const now = deps.now ?? (() => Date.now());
+  return async (input: YoutubePlaybackLaunchInput): Promise<boolean> => {
+    const targetUrl = input.url.trim();
+    if (!targetUrl) return false;
+
+    const timeoutMs = Math.max(200, input.timeoutMs ?? 5000);
+    const pollIntervalMs = Math.max(25, input.pollIntervalMs ?? 100);
+
+    let previousPath = '';
+    try {
+      previousPath = normalizePath(await deps.requestPath());
+    } catch {
+      // Ignore transient path request failures and continue with bootstrap commands.
+    }
+
+    if (pathMatchesYoutubeTarget(previousPath, targetUrl)) {
+      return true;
+    }
+
+    deps.sendMpvCommand(['set_property', 'pause', 'yes']);
+    deps.sendMpvCommand(['set_property', 'sub-auto', 'no']);
+    deps.sendMpvCommand(['set_property', 'sid', 'no']);
+    deps.sendMpvCommand(['set_property', 'secondary-sid', 'no']);
+    deps.sendMpvCommand(['loadfile', targetUrl, 'replace']);
+
+    const deadline = now() + timeoutMs;
+    while (now() < deadline) {
+      await deps.wait(pollIntervalMs);
+      let currentPath = '';
+      try {
+        currentPath = normalizePath(await deps.requestPath());
+      } catch {
+        continue;
+      }
+      if (!currentPath) continue;
+      if (pathMatchesYoutubeTarget(currentPath, targetUrl)) {
+        if (!deps.requestProperty) {
+          return true;
+        }
+        try {
+          const trackList = await deps.requestProperty('track-list');
+          if (hasPlayableMediaTracks(trackList)) {
+            return true;
+          }
+        } catch {
+          // Continue polling until media tracks are actually available.
+        }
+      }
+      if (previousPath && currentPath !== previousPath) {
+        if (
+          isYoutubeMediaPath(currentPath) &&
+          isYoutubeMediaPath(targetUrl)
+        ) {
+          return true;
+        }
+        if (deps.requestProperty) {
+          try {
+            const trackList = await deps.requestProperty('track-list');
+            if (hasPlayableMediaTracks(trackList)) {
+              return true;
+            }
+          } catch {
+            // Continue polling until media tracks are actually available.
+          }
+        }
+      }
+    }
+
+    return false;
+  };
+}

src/main/runtime/youtube-primary-subtitle-notification.ts

@@ -181,5 +181,6 @@ export function createYoutubePrimarySubtitleNotificationRuntime(deps: {
       }
       schedulePendingCheck();
     },
+    isAppOwnedFlowInFlight: (): boolean => appOwnedFlowInFlight,
   };
 }

src/renderer/handlers/mouse.test.ts

@@ -759,6 +759,76 @@ test('restorePointerInteractionState re-enables subtitle hover when pointer is a
     }
     handlers.restorePointerInteractionState();
 
+    assert.equal(ctx.state.isOverSubtitle, true);
+    assert.equal(ctx.dom.overlay.classList.contains('interactive'), true);
+    assert.deepEqual(ignoreCalls, [
+      { ignore: false, forward: undefined },
+      { ignore: false, forward: undefined },
+    ]);
+  } finally {
+    Object.defineProperty(globalThis, 'window', { configurable: true, value: originalWindow });
+    Object.defineProperty(globalThis, 'document', { configurable: true, value: originalDocument });
+  }
+});
+
+test('pointer tracking enables overlay interaction as soon as the cursor reaches subtitles', () => {
+  const ctx = createMouseTestContext();
+  const originalWindow = globalThis.window;
+  const originalDocument = globalThis.document;
+  const ignoreCalls: Array<{ ignore: boolean; forward?: boolean }> = [];
+  const documentListeners = new Map<string, Array<(event: unknown) => void>>();
+  ctx.platform.shouldToggleMouseIgnore = true;
+
+  Object.defineProperty(globalThis, 'window', {
+    configurable: true,
+    value: {
+      electronAPI: {
+        setIgnoreMouseEvents: (ignore: boolean, options?: { forward?: boolean }) => {
+          ignoreCalls.push({ ignore, forward: options?.forward });
+        },
+      },
+      getComputedStyle: () => ({
+        visibility: 'hidden',
+        display: 'none',
+        opacity: '0',
+      }),
+      focus: () => {},
+    },
+  });
+  Object.defineProperty(globalThis, 'document', {
+    configurable: true,
+    value: {
+      addEventListener: (type: string, listener: (event: unknown) => void) => {
+        const bucket = documentListeners.get(type) ?? [];
+        bucket.push(listener);
+        documentListeners.set(type, bucket);
+      },
+      elementFromPoint: () => ctx.dom.subtitleContainer,
+      querySelectorAll: () => [],
+      body: {},
+    },
+  });
+
+  try {
+    const handlers = createMouseHandlers(ctx as never, {
+      modalStateReader: {
+        isAnySettingsModalOpen: () => false,
+        isAnyModalOpen: () => false,
+      },
+      applyYPercent: () => {},
+      getCurrentYPercent: () => 10,
+      persistSubtitlePositionPatch: () => {},
+      getSubtitleHoverAutoPauseEnabled: () => false,
+      getYomitanPopupAutoPauseEnabled: () => false,
+      getPlaybackPaused: async () => false,
+      sendMpvCommand: () => {},
+    });
+
+    handlers.setupPointerTracking();
+    for (const listener of documentListeners.get('mousemove') ?? []) {
+      listener({ clientX: 120, clientY: 240 });
+    }
+
     assert.equal(ctx.state.isOverSubtitle, true);
     assert.equal(ctx.dom.overlay.classList.contains('interactive'), true);
     assert.deepEqual(ignoreCalls, [{ ignore: false, forward: undefined }]);
@@ -768,6 +838,82 @@ test('restorePointerInteractionState re-enables subtitle hover when pointer is a
   }
 });
 
+test('pointer tracking restores click-through after the cursor leaves subtitles', () => {
+  const ctx = createMouseTestContext();
+  const originalWindow = globalThis.window;
+  const originalDocument = globalThis.document;
+  const ignoreCalls: Array<{ ignore: boolean; forward?: boolean }> = [];
+  const documentListeners = new Map<string, Array<(event: unknown) => void>>();
+  let hoveredElement: unknown = ctx.dom.subtitleContainer;
+  ctx.platform.shouldToggleMouseIgnore = true;
+
+  Object.defineProperty(globalThis, 'window', {
+    configurable: true,
+    value: {
+      electronAPI: {
+        setIgnoreMouseEvents: (ignore: boolean, options?: { forward?: boolean }) => {
+          ignoreCalls.push({ ignore, forward: options?.forward });
+        },
+      },
+      getComputedStyle: () => ({
+        visibility: 'hidden',
+        display: 'none',
+        opacity: '0',
+      }),
+      focus: () => {},
+    },
+  });
+  Object.defineProperty(globalThis, 'document', {
+    configurable: true,
+    value: {
+      addEventListener: (type: string, listener: (event: unknown) => void) => {
+        const bucket = documentListeners.get(type) ?? [];
+        bucket.push(listener);
+        documentListeners.set(type, bucket);
+      },
+      elementFromPoint: () => hoveredElement,
+      querySelectorAll: () => [],
+      body: {},
+    },
+  });
+
+  try {
+    const handlers = createMouseHandlers(ctx as never, {
+      modalStateReader: {
+        isAnySettingsModalOpen: () => false,
+        isAnyModalOpen: () => false,
+      },
+      applyYPercent: () => {},
+      getCurrentYPercent: () => 10,
+      persistSubtitlePositionPatch: () => {},
+      getSubtitleHoverAutoPauseEnabled: () => false,
+      getYomitanPopupAutoPauseEnabled: () => false,
+      getPlaybackPaused: async () => false,
+      sendMpvCommand: () => {},
+    });
+
+    handlers.setupPointerTracking();
+    for (const listener of documentListeners.get('mousemove') ?? []) {
+      listener({ clientX: 120, clientY: 240 });
+    }
+
+    hoveredElement = null;
+    for (const listener of documentListeners.get('mousemove') ?? []) {
+      listener({ clientX: 640, clientY: 360 });
+    }
+
+    assert.equal(ctx.state.isOverSubtitle, false);
+    assert.equal(ctx.dom.overlay.classList.contains('interactive'), false);
+    assert.deepEqual(ignoreCalls, [
+      { ignore: false, forward: undefined },
+      { ignore: true, forward: true },
+    ]);
+  } finally {
+    Object.defineProperty(globalThis, 'window', { configurable: true, value: originalWindow });
+    Object.defineProperty(globalThis, 'document', { configurable: true, value: originalDocument });
+  }
+});
+
 test('restorePointerInteractionState keeps overlay interactive until first real pointer move can resync hover', () => {
   const ctx = createMouseTestContext();
   const originalWindow = globalThis.window;

src/renderer/handlers/mouse.ts

@@ -20,6 +20,12 @@ export function createMouseHandlers(
     sendMpvCommand: (command: (string | number)[]) => void;
   },
 ) {
+  type HoverPointState = {
+    overPrimarySubtitle: boolean;
+    overSecondarySubtitle: boolean;
+    isOverSubtitle: boolean;
+  };
+
   let yomitanPopupVisible = false;
   let hoverPauseRequestId = 0;
   let popupPauseRequestId = 0;
@@ -45,7 +51,7 @@ export function createMouseHandlers(
     };
   }
 
-  function syncHoverStateFromPoint(clientX: number, clientY: number): boolean {
+  function getHoverStateFromPoint(clientX: number, clientY: number): HoverPointState {
     const hoveredElement =
       typeof document.elementFromPoint === 'function'
         ? document.elementFromPoint(clientX, clientY)
@@ -56,13 +62,52 @@ export function createMouseHandlers(
       ctx.dom.secondarySubContainer,
     );
 
-    ctx.state.isOverSubtitle = overPrimarySubtitle || overSecondarySubtitle;
+    return {
+      overPrimarySubtitle,
+      overSecondarySubtitle,
+      isOverSubtitle: overPrimarySubtitle || overSecondarySubtitle,
+    };
+  }
+
+  function syncHoverStateFromPoint(clientX: number, clientY: number): HoverPointState {
+    const hoverState = getHoverStateFromPoint(clientX, clientY);
+
+    ctx.state.isOverSubtitle = hoverState.isOverSubtitle;
     ctx.dom.secondarySubContainer.classList.toggle(
       'secondary-sub-hover-active',
-      overSecondarySubtitle,
+      hoverState.overSecondarySubtitle,
     );
 
-    return ctx.state.isOverSubtitle;
+    return hoverState;
+  }
+
+  function syncHoverStateFromTrackedPointer(event: MouseEvent | PointerEvent): void {
+    if (!ctx.platform.shouldToggleMouseIgnore || ctx.state.isDragging) {
+      return;
+    }
+
+    const wasOverSubtitle = ctx.state.isOverSubtitle;
+    const wasOverSecondarySubtitle = ctx.dom.secondarySubContainer.classList.contains(
+      'secondary-sub-hover-active',
+    );
+    const hoverState = syncHoverStateFromPoint(event.clientX, event.clientY);
+
+    if (!wasOverSubtitle && hoverState.isOverSubtitle) {
+      void handleMouseEnter(undefined, hoverState.overSecondarySubtitle);
+      return;
+    }
+
+    if (wasOverSubtitle && !hoverState.isOverSubtitle) {
+      void handleMouseLeave(undefined, wasOverSecondarySubtitle);
+      return;
+    }
+
+    if (
+      hoverState.isOverSubtitle &&
+      hoverState.overSecondarySubtitle !== wasOverSecondarySubtitle
+    ) {
+      syncOverlayMouseIgnoreState(ctx);
+    }
   }
 
   function restorePointerInteractionState(): void {
@@ -293,10 +338,12 @@ export function createMouseHandlers(
   function setupPointerTracking(): void {
     document.addEventListener('mousemove', (event: MouseEvent) => {
       updatePointerPosition(event);
+      syncHoverStateFromTrackedPointer(event);
       maybeResyncPointerHoverState(event);
     });
     document.addEventListener('pointermove', (event: PointerEvent) => {
       updatePointerPosition(event);
+      syncHoverStateFromTrackedPointer(event);
       maybeResyncPointerHoverState(event);
     });
   }