diff --git a/README.md b/README.md
index f326d88..70d9625 100644
--- a/README.md
+++ b/README.md
@@ -27,7 +27,7 @@ SubMiner is an Electron overlay that sits on top of mpv. It turns your video pla
 - **Dictionary lookups** — Yomitan popups on subtitles with hover or full keyboard-driven navigation; hover-aware auto-pause keeps playback in sync
 - **One-key mining** — Creates Anki cards with sentence, audio, screenshot, and AI-powered translation
 - **Reading annotations** — N+1 targeting, frequency highlighting, and JLPT underlining while you watch
-- **Subtitle tools** — Jimaku downloads, alass/ffsubsync sync, and whisper.cpp transcription for YouTube with optional AI cleanup
+- **Subtitle tools** — Jimaku downloads, alass/ffsubsync sync, and YouTube subtitle generation via manual-track reuse plus whisper.cpp fallback with optional AI cleanup
 - **Texthooker** — Built-in texthooker page and annotated websocket API for external clients
 - **Immersion tracking** — SQLite-powered stats on watch time and mining activity
 - **Integrations** — Jellyfin remote playback, AniList episode progress, and AnkiConnect auto-enrichment
diff --git a/changes/youtube-single-flow.md b/changes/youtube-single-flow.md
new file mode 100644
index 0000000..22d5096
--- /dev/null
+++ b/changes/youtube-single-flow.md
@@ -0,0 +1,4 @@
+type: changed
+area: launcher
+
+- Removed the YouTube subtitle generation mode switch so YouTube playback always preloads subtitles before mpv starts.
diff --git a/config.example.jsonc b/config.example.jsonc
index 34654c7..d831e9c 100644
--- a/config.example.jsonc
+++ b/config.example.jsonc
@@ -5,7 +5,6 @@
  * Copy to $XDG_CONFIG_HOME/SubMiner/config.jsonc (or ~/.config/SubMiner/config.jsonc) and edit as needed.
  */
 {
-
   // ==========================================
   // Overlay Auto-Start
   // When overlay connects to mpv, automatically show overlay and hide mpv subtitles.
@@ -18,7 +17,7 @@
   // ==========================================
   "texthooker": {
     "launchAtStartup": true, // Launch texthooker server automatically when SubMiner starts. Values: true | false
-    "openBrowser": true // Open browser setting. Values: true | false
+    "openBrowser": true, // Open browser setting. Values: true | false
   }, // Configure texthooker startup launch and browser opening behavior.
 
   // ==========================================
@@ -28,7 +27,7 @@
   // ==========================================
   "websocket": {
     "enabled": "auto", // Built-in subtitle websocket server mode. Values: auto | true | false
-    "port": 6677 // Built-in subtitle websocket server port.
+    "port": 6677, // Built-in subtitle websocket server port.
   }, // Built-in WebSocket server broadcasts subtitle text to connected clients.
 
   // ==========================================
@@ -38,7 +37,7 @@
   // ==========================================
   "annotationWebsocket": {
     "enabled": true, // Annotated subtitle websocket server enabled state. Values: true | false
-    "port": 6678 // Annotated subtitle websocket server port.
+    "port": 6678, // Annotated subtitle websocket server port.
   }, // Dedicated annotated subtitle websocket for bundled texthooker and token-aware clients.
 
   // ==========================================
@@ -47,7 +46,7 @@
   // Set to debug for full runtime diagnostics.
   // ==========================================
   "logging": {
-    "level": "info" // Minimum log level for runtime logging. Values: debug | info | warn | error
+    "level": "info", // Minimum log level for runtime logging. Values: debug | info | warn | error
   }, // Controls logging verbosity.
 
   // ==========================================
@@ -61,7 +60,7 @@
     "mecab": true, // Warm up MeCab tokenizer at startup. Values: true | false
     "yomitanExtension": true, // Warm up Yomitan extension at startup. Values: true | false
     "subtitleDictionaries": true, // Warm up subtitle dictionaries at startup. Values: true | false
-    "jellyfinRemoteSession": true // Warm up Jellyfin remote session at startup. Values: true | false
+    "jellyfinRemoteSession": true, // Warm up Jellyfin remote session at startup. Values: true | false
   }, // Background warmup controls for MeCab, Yomitan, dictionaries, and Jellyfin session.
 
   // ==========================================
@@ -82,7 +81,7 @@
     "toggleSecondarySub": "CommandOrControl+Shift+V", // Toggle secondary sub setting.
     "markAudioCard": "CommandOrControl+Shift+A", // Mark audio card setting.
     "openRuntimeOptions": "CommandOrControl+Shift+O", // Open runtime options setting.
-    "openJimaku": "Ctrl+Shift+J" // Open jimaku setting.
+    "openJimaku": "Ctrl+Shift+J", // Open jimaku setting.
   }, // Overlay keyboard shortcuts. Set a shortcut to null to disable.
 
   // ==========================================
@@ -102,7 +101,7 @@
   "secondarySub": {
     "secondarySubLanguages": [], // Secondary sub languages setting.
     "autoLoadSecondarySub": false, // Auto load secondary sub setting. Values: true | false
-    "defaultMode": "hover" // Default mode setting.
+    "defaultMode": "hover", // Default mode setting.
   }, // Dual subtitle track options.
 
   // ==========================================
@@ -114,7 +113,7 @@
     "alass_path": "", // Alass path setting.
     "ffsubsync_path": "", // Ffsubsync path setting.
     "ffmpeg_path": "", // Ffmpeg path setting.
-    "replace": true // Replace the active subtitle file when sync completes. Values: true | false
+    "replace": true, // Replace the active subtitle file when sync completes. Values: true | false
   }, // Subsync engine and executable paths.
 
   // ==========================================
@@ -122,7 +121,7 @@
   // Initial vertical subtitle position from the bottom.
   // ==========================================
   "subtitlePosition": {
-    "yPercent": 10 // Y percent setting.
+    "yPercent": 10, // Y percent setting.
   }, // Initial vertical subtitle position from the bottom.
 
   // ==========================================
@@ -159,7 +158,7 @@
       "N2": "#f5a97f", // N2 setting.
       "N3": "#f9e2af", // N3 setting.
       "N4": "#a6e3a1", // N4 setting.
-      "N5": "#8aadf4" // N5 setting.
+      "N5": "#8aadf4", // N5 setting.
     }, // Jlpt colors setting.
     "frequencyDictionary": {
       "enabled": false, // Enable frequency-dictionary-based highlighting based on token rank. Values: true | false
@@ -168,13 +167,7 @@
       "mode": "single", // single: use one color for all matching tokens. banded: use color ramp by frequency band. Values: single | banded
       "matchMode": "headword", // headword: frequency lookup uses dictionary form. surface: lookup uses subtitle-visible token text. Values: headword | surface
       "singleColor": "#f5a97f", // Color used when frequencyDictionary.mode is `single`.
-      "bandedColors": [
-        "#ed8796",
-        "#f5a97f",
-        "#f9e2af",
-        "#8bd5ca",
-        "#8aadf4"
-      ] // Five colors used for rank bands when mode is `banded` (from most common to least within topX).
+      "bandedColors": ["#ed8796", "#f5a97f", "#f9e2af", "#8bd5ca", "#8aadf4"], // Five colors used for rank bands when mode is `banded` (from most common to least within topX).
     }, // Frequency dictionary setting.
     "secondary": {
       "fontFamily": "Inter, Noto Sans, Helvetica Neue, sans-serif", // Font family setting.
@@ -189,14 +182,27 @@
       "backgroundColor": "rgba(20, 22, 34, 0.78)", // Background color setting.
       "backdropFilter": "blur(6px)", // Backdrop filter setting.
       "fontWeight": "600", // Font weight setting.
-      "fontStyle": "normal" // Font style setting.
-    } // Secondary setting.
+      "fontStyle": "normal", // Font style setting.
+    }, // Secondary setting.
   }, // Primary and secondary subtitle styling.
 
+  // ==========================================
+  // Shared AI Provider
+  // Canonical OpenAI-compatible provider transport settings shared by Anki and YouTube subtitle fixing.
+  // ==========================================
+  "ai": {
+    "enabled": false, // Enable shared OpenAI-compatible AI provider features. Values: true | false
+    "apiKey": "", // Static API key for the shared OpenAI-compatible AI provider.
+    "apiKeyCommand": "", // Shell command used to resolve the shared AI provider API key.
+    "baseUrl": "https://openrouter.ai/api", // Base URL for the shared OpenAI-compatible AI provider.
+    "requestTimeoutMs": 15000, // Timeout in milliseconds for shared AI provider requests.
+  }, // Canonical OpenAI-compatible provider transport settings shared by Anki and YouTube subtitle fixing.
+
   // ==========================================
   // AnkiConnect Integration
   // Automatic Anki updates and media generation options.
-  // Hot-reload: AI translation settings update live while SubMiner is running.
+  // Hot-reload: ankiConnect.ai.enabled updates live while SubMiner is running.
+  // Shared AI provider transport settings are read from top-level ai and typically require restart.
   // Most other AnkiConnect settings still require restart.
   // ==========================================
   "ankiConnect": {
@@ -207,26 +213,20 @@
       "enabled": true, // Enable local AnkiConnect-compatible proxy for push-based auto-enrichment. Values: true | false
       "host": "127.0.0.1", // Bind host for local AnkiConnect proxy.
       "port": 8766, // Bind port for local AnkiConnect proxy.
-      "upstreamUrl": "http://127.0.0.1:8765" // Upstream AnkiConnect URL proxied by local AnkiConnect proxy.
+      "upstreamUrl": "http://127.0.0.1:8765", // Upstream AnkiConnect URL proxied by local AnkiConnect proxy.
     }, // Proxy setting.
-    "tags": [
-      "SubMiner"
-    ], // Tags to add to cards mined or updated by SubMiner. Provide an empty array to disable automatic tagging.
+    "tags": ["SubMiner"], // Tags to add to cards mined or updated by SubMiner. Provide an empty array to disable automatic tagging.
     "fields": {
       "audio": "ExpressionAudio", // Audio setting.
       "image": "Picture", // Image setting.
       "sentence": "Sentence", // Sentence setting.
       "miscInfo": "MiscInfo", // Misc info setting.
-      "translation": "SelectionText" // Translation setting.
+      "translation": "SelectionText", // Translation setting.
     }, // Fields setting.
     "ai": {
-      "enabled": false, // Enabled setting. Values: true | false
-      "alwaysUseAiTranslation": false, // Always use ai translation setting. Values: true | false
-      "apiKey": "", // Api key setting.
-      "model": "openai/gpt-4o-mini", // Model setting.
-      "baseUrl": "https://openrouter.ai/api", // Base url setting.
-      "targetLanguage": "English", // Target language setting.
-      "systemPrompt": "You are a translation engine. Return only the translated text with no explanations." // System prompt setting.
+      "enabled": false, // Enable AI provider usage for Anki translation/enrichment flows. Values: true | false
+      "model": "", // Optional model override for Anki AI translation/enrichment flows.
+      "systemPrompt": "", // Optional system prompt override for Anki AI translation/enrichment flows.
     }, // Ai setting.
     "media": {
       "generateAudio": true, // Generate audio setting. Values: true | false
@@ -239,7 +239,7 @@
       "animatedCrf": 35, // Animated crf setting.
       "audioPadding": 0.5, // Audio padding setting.
       "fallbackDuration": 3, // Fallback duration setting.
-      "maxMediaDuration": 30 // Max media duration setting.
+      "maxMediaDuration": 30, // Max media duration setting.
     }, // Media setting.
     "behavior": {
       "overwriteAudio": true, // Overwrite audio setting. Values: true | false
@@ -247,7 +247,7 @@
       "mediaInsertMode": "append", // Media insert mode setting.
       "highlightWord": true, // Highlight word setting. Values: true | false
       "notificationType": "osd", // Notification type setting.
-      "autoUpdateNewCards": true // Automatically update newly added cards. Values: true | false
+      "autoUpdateNewCards": true, // Automatically update newly added cards. Values: true | false
     }, // Behavior setting.
     "nPlusOne": {
       "highlightEnabled": false, // Enable fast local highlighting for words already known in Anki. Values: true | false
@@ -256,20 +256,20 @@
       "decks": [], // Decks used for N+1 known-word cache scope. Supports one or more deck names.
       "minSentenceWords": 3, // Minimum sentence word count required for N+1 targeting (default: 3).
       "nPlusOne": "#c6a0f6", // Color used for the single N+1 target token highlight.
-      "knownWord": "#a6da95" // Color used for legacy known-word highlights.
+      "knownWord": "#a6da95", // Color used for legacy known-word highlights.
     }, // N plus one setting.
     "metadata": {
-      "pattern": "[SubMiner] %f (%t)" // Pattern setting.
+      "pattern": "[SubMiner] %f (%t)", // Pattern setting.
     }, // Metadata setting.
     "isLapis": {
       "enabled": false, // Enabled setting. Values: true | false
-      "sentenceCardModel": "Japanese sentences" // Sentence card model setting.
+      "sentenceCardModel": "Japanese sentences", // Sentence card model setting.
     }, // Is lapis setting.
     "isKiku": {
       "enabled": false, // Enabled setting. Values: true | false
       "fieldGrouping": "disabled", // Kiku duplicate-card field grouping mode. Values: auto | manual | disabled
-      "deleteDuplicateInAuto": true // Delete duplicate in auto setting. Values: true | false
-    } // Is kiku setting.
+      "deleteDuplicateInAuto": true, // Delete duplicate in auto setting. Values: true | false
+    }, // Is kiku setting.
   }, // Automatic Anki updates and media generation options.
 
   // ==========================================
@@ -279,22 +279,25 @@
   "jimaku": {
     "apiBaseUrl": "https://jimaku.cc", // Api base url setting.
     "languagePreference": "ja", // Preferred language used in Jimaku search. Values: ja | en | none
-    "maxEntryResults": 10 // Maximum Jimaku search results returned.
+    "maxEntryResults": 10, // Maximum Jimaku search results returned.
   }, // Jimaku API configuration and defaults.
 
   // ==========================================
   // YouTube Subtitle Generation
-  // Defaults for subminer YouTube subtitle extraction/transcription mode.
+  // Defaults for SubMiner YouTube subtitle generation.
   // ==========================================
   "youtubeSubgen": {
-    "mode": "automatic", // YouTube subtitle generation mode for the launcher script. Values: automatic | preprocess | off
     "whisperBin": "", // Path to whisper.cpp CLI used as fallback transcription engine.
     "whisperModel": "", // Path to whisper model used for fallback transcription.
-    "primarySubLanguages": [
-      "ja",
-      "jpn"
-    ] // Comma-separated primary subtitle language priority used by the launcher.
-  }, // Defaults for subminer YouTube subtitle extraction/transcription mode.
+    "whisperVadModel": "", // Path to optional whisper VAD model used for subtitle generation.
+    "whisperThreads": 4, // Thread count passed to whisper.cpp subtitle generation runs.
+    "fixWithAi": false, // Use shared AI provider to post-process whisper-generated YouTube subtitles. Values: true | false
+    "ai": {
+      "model": "", // Optional model override for YouTube subtitle AI post-processing.
+      "systemPrompt": "", // Optional system prompt override for YouTube subtitle AI post-processing.
+    }, // Ai setting.
+    "primarySubLanguages": ["ja", "jpn"], // Comma-separated primary subtitle language priority used by the launcher.
+  }, // Defaults for SubMiner YouTube subtitle generation.
 
   // ==========================================
   // Anilist
@@ -314,9 +317,9 @@
       "collapsibleSections": {
         "description": false, // Open the Description section by default in character dictionary glossary entries. Values: true | false
         "characterInformation": false, // Open the Character Information section by default in character dictionary glossary entries. Values: true | false
-        "voicedBy": false // Open the Voiced by section by default in character dictionary glossary entries. Values: true | false
-      } // Collapsible sections setting.
-    } // Character dictionary setting.
+        "voicedBy": false, // Open the Voiced by section by default in character dictionary glossary entries. Values: true | false
+      }, // Collapsible sections setting.
+    }, // Character dictionary setting.
   }, // Anilist API credentials and update behavior.
 
   // ==========================================
@@ -340,16 +343,8 @@
     "pullPictures": false, // Enable Jellyfin poster/icon fetching for launcher menus. Values: true | false
     "iconCacheDir": "/tmp/subminer-jellyfin-icons", // Directory used by launcher for cached Jellyfin poster icons.
     "directPlayPreferred": true, // Try direct play before server-managed transcoding when possible. Values: true | false
-    "directPlayContainers": [
-      "mkv",
-      "mp4",
-      "webm",
-      "mov",
-      "flac",
-      "mp3",
-      "aac"
-    ], // Container allowlist for direct play decisions.
-    "transcodeVideoCodec": "h264" // Preferred transcode video codec when direct play is unavailable.
+    "directPlayContainers": ["mkv", "mp4", "webm", "mov", "flac", "mp3", "aac"], // Container allowlist for direct play decisions.
+    "transcodeVideoCodec": "h264", // Preferred transcode video codec when direct play is unavailable.
   }, // Optional Jellyfin integration for auth, browsing, and playback launch.
 
   // ==========================================
@@ -360,7 +355,7 @@
   "discordPresence": {
     "enabled": false, // Enable optional Discord Rich Presence updates. Values: true | false
     "updateIntervalMs": 3000, // Minimum interval between presence payload updates.
-    "debounceMs": 750 // Debounce delay used to collapse bursty presence updates.
+    "debounceMs": 750, // Debounce delay used to collapse bursty presence updates.
   }, // Optional Discord Rich Presence activity card updates for current playback/study session.
 
   // ==========================================
@@ -382,7 +377,7 @@
       "telemetryDays": 30, // Telemetry retention window in days.
       "dailyRollupsDays": 365, // Daily rollup retention window in days.
       "monthlyRollupsDays": 1825, // Monthly rollup retention window in days.
-      "vacuumIntervalDays": 7 // Minimum days between VACUUM runs.
-    } // Retention setting.
-  } // Enable/disable immersion tracking.
+      "vacuumIntervalDays": 7, // Minimum days between VACUUM runs.
+    }, // Retention setting.
+  }, // Enable/disable immersion tracking.
 }
diff --git a/launcher/commands/playback-command.ts b/launcher/commands/playback-command.ts
index 565de16..7aa1a96 100644
--- a/launcher/commands/playback-command.ts
+++ b/launcher/commands/playback-command.ts
@@ -34,12 +34,7 @@ function checkDependencies(args: Args): void {
     missing.push('yt-dlp');
   }
 
-  if (
-    args.targetKind === 'url' &&
-    isYoutubeTarget(args.target) &&
-    args.youtubeSubgenMode !== 'off' &&
-    !commandExists('ffmpeg')
-  ) {
+  if (args.targetKind === 'url' && isYoutubeTarget(args.target) && !commandExists('ffmpeg')) {
     missing.push('ffmpeg');
   }
 
@@ -164,22 +159,28 @@ export async function runPlaybackCommand(context: LauncherCommandContext): Promi
   const isYoutubeUrl = selectedTarget.kind === 'url' && isYoutubeTarget(selectedTarget.target);
   let preloadedSubtitles: { primaryPath?: string; secondaryPath?: string } | undefined;
 
-  if (isYoutubeUrl && args.youtubeSubgenMode === 'preprocess') {
-    log('info', args.logLevel, 'YouTube subtitle mode: preprocess');
+  if (isYoutubeUrl) {
+    log('info', args.logLevel, 'YouTube subtitle generation: preload before mpv');
     const generated = await generateYoutubeSubtitles(selectedTarget.target, args);
     preloadedSubtitles = {
       primaryPath: generated.primaryPath,
       secondaryPath: generated.secondaryPath,
     };
+    const primaryStatus = generated.primaryPath
+      ? 'ready'
+      : generated.primaryNative
+        ? 'native'
+        : 'missing';
+    const secondaryStatus = generated.secondaryPath
+      ? 'ready'
+      : generated.secondaryNative
+        ? 'native'
+        : 'missing';
     log(
       'info',
       args.logLevel,
-      `YouTube preprocess result: primary=${generated.primaryPath ? 'ready' : 'missing'}, secondary=${generated.secondaryPath ? 'ready' : 'missing'}`,
+      `YouTube subtitle result: primary=${primaryStatus}, secondary=${secondaryStatus}`,
     );
-  } else if (isYoutubeUrl && args.youtubeSubgenMode === 'automatic') {
-    log('info', args.logLevel, 'YouTube subtitle mode: automatic (background)');
-  } else if (isYoutubeUrl) {
-    log('info', args.logLevel, 'YouTube subtitle mode: off');
   }
 
   const shouldPauseUntilOverlayReady =
@@ -201,26 +202,6 @@ export async function runPlaybackCommand(context: LauncherCommandContext): Promi
     { startPaused: shouldPauseUntilOverlayReady },
   );
 
-  if (isYoutubeUrl && args.youtubeSubgenMode === 'automatic') {
-    void generateYoutubeSubtitles(selectedTarget.target, args, async (lang, subtitlePath) => {
-      try {
-        await loadSubtitleIntoMpv(mpvSocketPath, subtitlePath, lang === 'primary', args.logLevel);
-      } catch (error) {
-        log(
-          'warn',
-          args.logLevel,
-          `Generated subtitle ready but failed to load in mpv: ${(error as Error).message}`,
-        );
-      }
-    }).catch((error) => {
-      log(
-        'warn',
-        args.logLevel,
-        `Background subtitle generation failed: ${(error as Error).message}`,
-      );
-    });
-  }
-
   const ready = await waitForUnixSocketReady(mpvSocketPath, 10000);
   const pluginAutoStartEnabled = pluginRuntimeConfig.autoStart;
   const shouldStartOverlay = args.startOverlay || args.autoStartOverlay;
diff --git a/launcher/config-domain-parsers.test.ts b/launcher/config-domain-parsers.test.ts
index 14be87d..7c2da07 100644
--- a/launcher/config-domain-parsers.test.ts
+++ b/launcher/config-domain-parsers.test.ts
@@ -6,10 +6,24 @@ import { parsePluginRuntimeConfigContent } from './config/plugin-runtime-config.
 
 test('parseLauncherYoutubeSubgenConfig keeps only valid typed values', () => {
   const parsed = parseLauncherYoutubeSubgenConfig({
+    ai: {
+      enabled: true,
+      apiKey: 'shared-key',
+      baseUrl: 'https://openrouter.ai/api',
+      model: 'openrouter/shared-model',
+      systemPrompt: 'Legacy shared prompt.',
+      requestTimeoutMs: 12000,
+    },
     youtubeSubgen: {
-      mode: 'preprocess',
       whisperBin: '/usr/bin/whisper',
       whisperModel: '/models/base.bin',
+      whisperVadModel: '/models/vad.bin',
+      whisperThreads: 6.8,
+      fixWithAi: true,
+      ai: {
+        model: 'openrouter/subgen-model',
+        systemPrompt: 'Fix subtitles only.',
+      },
       primarySubLanguages: ['ja', 42, 'en'],
     },
     secondarySub: {
@@ -24,9 +38,17 @@ test('parseLauncherYoutubeSubgenConfig keeps only valid typed values', () => {
     },
   });
 
-  assert.equal(parsed.mode, 'preprocess');
+  assert.equal('mode' in parsed, false);
   assert.deepEqual(parsed.primarySubLanguages, ['ja', 'en']);
   assert.deepEqual(parsed.secondarySubLanguages, ['eng', 'deu']);
+  assert.equal(parsed.whisperVadModel, '/models/vad.bin');
+  assert.equal(parsed.whisperThreads, 6);
+  assert.equal(parsed.fixWithAi, true);
+  assert.equal(parsed.ai?.enabled, true);
+  assert.equal(parsed.ai?.apiKey, 'shared-key');
+  assert.equal(parsed.ai?.model, 'openrouter/subgen-model');
+  assert.equal(parsed.ai?.systemPrompt, 'Fix subtitles only.');
+  assert.equal(parsed.ai?.requestTimeoutMs, 12000);
   assert.equal(parsed.jimakuLanguagePreference, 'ja');
   assert.equal(parsed.jimakuMaxEntryResults, 8);
 });
diff --git a/launcher/config/args-normalizer.ts b/launcher/config/args-normalizer.ts
index e307d67..44a34b9 100644
--- a/launcher/config/args-normalizer.ts
+++ b/launcher/config/args-normalizer.ts
@@ -1,13 +1,7 @@
 import fs from 'node:fs';
 import path from 'node:path';
 import { fail } from '../log.js';
-import type {
-  Args,
-  Backend,
-  LauncherYoutubeSubgenConfig,
-  LogLevel,
-  YoutubeSubgenMode,
-} from '../types.js';
+import type { Args, Backend, LauncherYoutubeSubgenConfig, LogLevel } from '../types.js';
 import {
   DEFAULT_JIMAKU_API_BASE_URL,
   DEFAULT_YOUTUBE_PRIMARY_SUB_LANGS,
@@ -54,14 +48,6 @@ function parseLogLevel(value: string): LogLevel {
   fail(`Invalid log level: ${value} (must be debug, info, warn, or error)`);
 }
 
-function parseYoutubeMode(value: string): YoutubeSubgenMode {
-  const normalized = value.toLowerCase();
-  if (normalized === 'automatic' || normalized === 'preprocess' || normalized === 'off') {
-    return normalized as YoutubeSubgenMode;
-  }
-  fail(`Invalid yt-subgen mode: ${value} (must be automatic, preprocess, or off)`);
-}
-
 function parseBackend(value: string): Backend {
   if (value === 'auto' || value === 'hyprland' || value === 'x11' || value === 'macos') {
     return value as Backend;
@@ -91,13 +77,6 @@ function parseDictionaryTarget(value: string): string {
 }
 
 export function createDefaultArgs(launcherConfig: LauncherYoutubeSubgenConfig): Args {
-  const envMode = (process.env.SUBMINER_YT_SUBGEN_MODE || '').toLowerCase();
-  const defaultMode: YoutubeSubgenMode =
-    envMode === 'preprocess' || envMode === 'off' || envMode === 'automatic'
-      ? (envMode as YoutubeSubgenMode)
-      : launcherConfig.mode
-        ? launcherConfig.mode
-        : 'automatic';
   const configuredSecondaryLangs = uniqueNormalizedLangCodes(
     launcherConfig.secondarySubLanguages ?? [],
   );
@@ -120,12 +99,18 @@ export function createDefaultArgs(launcherConfig: LauncherYoutubeSubgenConfig):
     recursive: false,
     profile: 'subminer',
     startOverlay: false,
-    youtubeSubgenMode: defaultMode,
     whisperBin: process.env.SUBMINER_WHISPER_BIN || launcherConfig.whisperBin || '',
     whisperModel: process.env.SUBMINER_WHISPER_MODEL || launcherConfig.whisperModel || '',
+    whisperVadModel: process.env.SUBMINER_WHISPER_VAD_MODEL || launcherConfig.whisperVadModel || '',
+    whisperThreads: (() => {
+      const envValue = Number.parseInt(process.env.SUBMINER_WHISPER_THREADS || '', 10);
+      if (Number.isInteger(envValue) && envValue > 0) return envValue;
+      return launcherConfig.whisperThreads || 4;
+    })(),
     youtubeSubgenOutDir: process.env.SUBMINER_YT_SUBGEN_OUT_DIR || DEFAULT_YOUTUBE_SUBGEN_OUT_DIR,
     youtubeSubgenAudioFormat: process.env.SUBMINER_YT_SUBGEN_AUDIO_FORMAT || 'm4a',
     youtubeSubgenKeepTemp: process.env.SUBMINER_YT_SUBGEN_KEEP_TEMP === '1',
+    youtubeFixWithAi: launcherConfig.fixWithAi === true,
     jimakuApiKey: process.env.SUBMINER_JIMAKU_API_KEY || '',
     jimakuApiKeyCommand: process.env.SUBMINER_JIMAKU_API_KEY_COMMAND || '',
     jimakuApiBaseUrl: process.env.SUBMINER_JIMAKU_API_BASE_URL || DEFAULT_JIMAKU_API_BASE_URL,
@@ -152,6 +137,15 @@ export function createDefaultArgs(launcherConfig: LauncherYoutubeSubgenConfig):
     youtubeSecondarySubLangs: secondarySubLangs,
     youtubeAudioLangs,
     youtubeWhisperSourceLanguage: inferWhisperLanguage(primarySubLangs, 'ja'),
+    aiConfig: {
+      enabled: launcherConfig.ai?.enabled,
+      apiKey: launcherConfig.ai?.apiKey,
+      apiKeyCommand: launcherConfig.ai?.apiKeyCommand,
+      baseUrl: launcherConfig.ai?.baseUrl,
+      model: launcherConfig.ai?.model,
+      systemPrompt: launcherConfig.ai?.systemPrompt,
+      requestTimeoutMs: launcherConfig.ai?.requestTimeoutMs,
+    },
     useTexthooker: true,
     autoStartOverlay: false,
     texthookerOnly: false,
@@ -242,8 +236,6 @@ export function applyInvocationsToArgs(parsed: Args, invocations: CliInvocations
   if (invocations.ytInvocation) {
     if (invocations.ytInvocation.logLevel)
       parsed.logLevel = parseLogLevel(invocations.ytInvocation.logLevel);
-    if (invocations.ytInvocation.mode)
-      parsed.youtubeSubgenMode = parseYoutubeMode(invocations.ytInvocation.mode);
     if (invocations.ytInvocation.outDir)
       parsed.youtubeSubgenOutDir = invocations.ytInvocation.outDir;
     if (invocations.ytInvocation.keepTemp) parsed.youtubeSubgenKeepTemp = true;
@@ -251,6 +243,10 @@ export function applyInvocationsToArgs(parsed: Args, invocations: CliInvocations
       parsed.whisperBin = invocations.ytInvocation.whisperBin;
     if (invocations.ytInvocation.whisperModel)
       parsed.whisperModel = invocations.ytInvocation.whisperModel;
+    if (invocations.ytInvocation.whisperVadModel)
+      parsed.whisperVadModel = invocations.ytInvocation.whisperVadModel;
+    if (invocations.ytInvocation.whisperThreads)
+      parsed.whisperThreads = invocations.ytInvocation.whisperThreads;
     if (invocations.ytInvocation.ytSubgenAudioFormat) {
       parsed.youtubeSubgenAudioFormat = invocations.ytInvocation.ytSubgenAudioFormat;
     }
diff --git a/launcher/config/cli-parser-builder.ts b/launcher/config/cli-parser-builder.ts
index 312bc38..126d8ef 100644
--- a/launcher/config/cli-parser-builder.ts
+++ b/launcher/config/cli-parser-builder.ts
@@ -16,11 +16,12 @@ export interface JellyfinInvocation {
 
 export interface YtInvocation {
   target?: string;
-  mode?: string;
   outDir?: string;
   keepTemp?: boolean;
   whisperBin?: string;
   whisperModel?: string;
+  whisperVadModel?: string;
+  whisperThreads?: number;
   ytSubgenAudioFormat?: string;
   logLevel?: string;
 }
@@ -201,21 +202,27 @@ export function parseCliPrograms(
     .alias('youtube')
     .description('YouTube workflows')
     .argument('[target]', 'YouTube URL or ytsearch: query')
-    .option('-m, --mode <mode>', 'Subtitle generation mode')
     .option('-o, --out-dir <dir>', 'Subtitle output dir')
     .option('--keep-temp', 'Keep temp files')
     .option('--whisper-bin <path>', 'whisper.cpp CLI path')
     .option('--whisper-model <path>', 'whisper model path')
+    .option('--whisper-vad-model <path>', 'whisper.cpp VAD model path')
+    .option('--whisper-threads <n>', 'whisper.cpp thread count')
     .option('--yt-subgen-audio-format <format>', 'Audio extraction format')
     .option('--log-level <level>', 'Log level')
     .action((target: string | undefined, options: Record<string, unknown>) => {
       ytInvocation = {
         target,
-        mode: typeof options.mode === 'string' ? options.mode : undefined,
         outDir: typeof options.outDir === 'string' ? options.outDir : undefined,
         keepTemp: options.keepTemp === true,
         whisperBin: typeof options.whisperBin === 'string' ? options.whisperBin : undefined,
         whisperModel: typeof options.whisperModel === 'string' ? options.whisperModel : undefined,
+        whisperVadModel:
+          typeof options.whisperVadModel === 'string' ? options.whisperVadModel : undefined,
+        whisperThreads:
+          typeof options.whisperThreads === 'number' && Number.isFinite(options.whisperThreads)
+            ? Math.floor(options.whisperThreads)
+            : undefined,
         ytSubgenAudioFormat:
           typeof options.ytSubgenAudioFormat === 'string' ? options.ytSubgenAudioFormat : undefined,
         logLevel: typeof options.logLevel === 'string' ? options.logLevel : undefined,
diff --git a/launcher/config/youtube-subgen-config.ts b/launcher/config/youtube-subgen-config.ts
index bfe7c34..eb1ecbd 100644
--- a/launcher/config/youtube-subgen-config.ts
+++ b/launcher/config/youtube-subgen-config.ts
@@ -1,4 +1,5 @@
 import type { LauncherYoutubeSubgenConfig } from '../types.js';
+import { mergeAiConfig } from '../../src/ai/config.js';
 
 function asStringArray(value: unknown): string[] | undefined {
   if (!Array.isArray(value)) return undefined;
@@ -21,17 +22,58 @@ export function parseLauncherYoutubeSubgenConfig(
   const jimakuRaw = root.jimaku;
   const jimaku =
     jimakuRaw && typeof jimakuRaw === 'object' ? (jimakuRaw as Record<string, unknown>) : null;
+  const aiRaw = root.ai;
+  const ai = aiRaw && typeof aiRaw === 'object' ? (aiRaw as Record<string, unknown>) : null;
+  const youtubeAiRaw = youtubeSubgen?.ai;
+  const youtubeAi =
+    youtubeAiRaw && typeof youtubeAiRaw === 'object'
+      ? (youtubeAiRaw as Record<string, unknown>)
+      : null;
 
-  const mode = youtubeSubgen?.mode;
   const jimakuLanguagePreference = jimaku?.languagePreference;
   const jimakuMaxEntryResults = jimaku?.maxEntryResults;
 
   return {
-    mode: mode === 'automatic' || mode === 'preprocess' || mode === 'off' ? mode : undefined,
     whisperBin:
       typeof youtubeSubgen?.whisperBin === 'string' ? youtubeSubgen.whisperBin : undefined,
     whisperModel:
       typeof youtubeSubgen?.whisperModel === 'string' ? youtubeSubgen.whisperModel : undefined,
+    whisperVadModel:
+      typeof youtubeSubgen?.whisperVadModel === 'string'
+        ? youtubeSubgen.whisperVadModel
+        : undefined,
+    whisperThreads:
+      typeof youtubeSubgen?.whisperThreads === 'number' &&
+      Number.isFinite(youtubeSubgen.whisperThreads) &&
+      youtubeSubgen.whisperThreads > 0
+        ? Math.floor(youtubeSubgen.whisperThreads)
+        : undefined,
+    fixWithAi: typeof youtubeSubgen?.fixWithAi === 'boolean' ? youtubeSubgen.fixWithAi : undefined,
+    ai: mergeAiConfig(
+      ai
+        ? {
+            enabled: typeof ai.enabled === 'boolean' ? ai.enabled : undefined,
+            apiKey: typeof ai.apiKey === 'string' ? ai.apiKey : undefined,
+            apiKeyCommand: typeof ai.apiKeyCommand === 'string' ? ai.apiKeyCommand : undefined,
+            baseUrl: typeof ai.baseUrl === 'string' ? ai.baseUrl : undefined,
+            model: typeof ai.model === 'string' ? ai.model : undefined,
+            systemPrompt: typeof ai.systemPrompt === 'string' ? ai.systemPrompt : undefined,
+            requestTimeoutMs:
+              typeof ai.requestTimeoutMs === 'number' &&
+              Number.isFinite(ai.requestTimeoutMs) &&
+              ai.requestTimeoutMs > 0
+                ? Math.floor(ai.requestTimeoutMs)
+                : undefined,
+          }
+        : undefined,
+      youtubeAi
+        ? {
+            model: typeof youtubeAi.model === 'string' ? youtubeAi.model : undefined,
+            systemPrompt:
+              typeof youtubeAi.systemPrompt === 'string' ? youtubeAi.systemPrompt : undefined,
+          }
+        : undefined,
+    ),
     primarySubLanguages: asStringArray(youtubeSubgen?.primarySubLanguages),
     secondarySubLanguages: asStringArray(secondarySub?.secondarySubLanguages),
     jimakuApiKey: typeof jimaku?.apiKey === 'string' ? jimaku.apiKey : undefined,
diff --git a/launcher/main.test.ts b/launcher/main.test.ts
index a8f0d24..62af91e 100644
--- a/launcher/main.test.ts
+++ b/launcher/main.test.ts
@@ -162,6 +162,134 @@ test('doctor reports checks and exits non-zero without hard dependencies', () =>
   });
 });
 
+test('youtube command rejects removed --mode option', () => {
+  withTempDir((root) => {
+    const homeDir = path.join(root, 'home');
+    const xdgConfigHome = path.join(root, 'xdg');
+    const appPath = path.join(root, 'fake-subminer.sh');
+    fs.writeFileSync(appPath, '#!/bin/sh\nexit 0\n');
+    fs.chmodSync(appPath, 0o755);
+
+    const env = {
+      ...makeTestEnv(homeDir, xdgConfigHome),
+      SUBMINER_APPIMAGE_PATH: appPath,
+    };
+    const result = runLauncher(
+      ['youtube', 'https://www.youtube.com/watch?v=test123', '--mode', 'automatic'],
+      env,
+    );
+
+    assert.equal(result.status, 1);
+    assert.match(result.stderr, /unknown option '--mode'/i);
+  });
+});
+
+test('youtube playback generates subtitles before mpv launch', () => {
+  withTempDir((root) => {
+    const homeDir = path.join(root, 'home');
+    const xdgConfigHome = path.join(root, 'xdg');
+    const binDir = path.join(root, 'bin');
+    const appPath = path.join(root, 'fake-subminer.sh');
+    const ytdlpLogPath = path.join(root, 'yt-dlp.log');
+    const mpvCapturePath = path.join(root, 'mpv-order.txt');
+    const mpvArgsPath = path.join(root, 'mpv-args.txt');
+    const socketPath = path.join(root, 'mpv.sock');
+
+    fs.mkdirSync(binDir, { recursive: true });
+    fs.mkdirSync(path.join(xdgConfigHome, 'SubMiner'), { recursive: true });
+    fs.mkdirSync(path.join(xdgConfigHome, 'mpv', 'script-opts'), { recursive: true });
+    fs.writeFileSync(
+      path.join(xdgConfigHome, 'SubMiner', 'setup-state.json'),
+      JSON.stringify({
+        version: 1,
+        status: 'completed',
+        completedAt: '2026-03-08T00:00:00.000Z',
+        completionSource: 'user',
+        lastSeenYomitanDictionaryCount: 0,
+        pluginInstallStatus: 'installed',
+        pluginInstallPathSummary: null,
+      }),
+    );
+    fs.writeFileSync(
+      path.join(xdgConfigHome, 'mpv', 'script-opts', 'subminer.conf'),
+      `socket_path=${socketPath}\nauto_start=no\nauto_start_visible_overlay=no\nauto_start_pause_until_ready=no\n`,
+    );
+    fs.writeFileSync(appPath, '#!/bin/sh\nexit 0\n');
+    fs.chmodSync(appPath, 0o755);
+
+    fs.writeFileSync(
+      path.join(binDir, 'yt-dlp'),
+      `#!/bin/sh
+set -eu
+printf '%s\\n' "$*" >> "$SUBMINER_TEST_YTDLP_LOG"
+if printf '%s\\n' "$*" | grep -q -- '--dump-single-json'; then
+  printf '{"id":"video123"}\\n'
+  exit 0
+fi
+out_dir=""
+prev=""
+for arg in "$@"; do
+  if [ "$prev" = "-o" ]; then
+    out_dir=$(dirname "$arg")
+    break
+  fi
+  prev="$arg"
+done
+mkdir -p "$out_dir"
+printf '1\\n00:00:00,000 --> 00:00:01,000\\nこんにちは\\n' > "$out_dir/video123.ja.srt"
+printf '1\\n00:00:00,000 --> 00:00:01,000\\nhello\\n' > "$out_dir/video123.en.srt"
+`,
+      'utf8',
+    );
+    fs.chmodSync(path.join(binDir, 'yt-dlp'), 0o755);
+
+    fs.writeFileSync(path.join(binDir, 'ffmpeg'), '#!/bin/sh\nexit 0\n', 'utf8');
+    fs.chmodSync(path.join(binDir, 'ffmpeg'), 0o755);
+
+    fs.writeFileSync(
+      path.join(binDir, 'mpv'),
+      `#!/bin/sh
+set -eu
+if [ -s "$SUBMINER_TEST_YTDLP_LOG" ]; then
+  printf 'generated-before-mpv\\n' > "$SUBMINER_TEST_MPV_ORDER"
+else
+  printf 'mpv-before-generation\\n' > "$SUBMINER_TEST_MPV_ORDER"
+fi
+printf '%s\\n' "$@" > "$SUBMINER_TEST_MPV_ARGS"
+socket_path=""
+for arg in "$@"; do
+  case "$arg" in
+    --input-ipc-server=*)
+      socket_path="\${arg#--input-ipc-server=}"
+      ;;
+  esac
+done
+bun -e "const net=require('node:net'); const fs=require('node:fs'); const socket=process.argv[1]; try { fs.rmSync(socket,{force:true}); } catch {} const server=net.createServer((conn)=>conn.end()); server.listen(socket,()=>setTimeout(()=>server.close(()=>process.exit(0)),250));" "$socket_path"
+`,
+      'utf8',
+    );
+    fs.chmodSync(path.join(binDir, 'mpv'), 0o755);
+
+    const env = {
+      ...makeTestEnv(homeDir, xdgConfigHome),
+      PATH: `${binDir}${path.delimiter}${process.env.PATH || ''}`,
+      SUBMINER_APPIMAGE_PATH: appPath,
+      SUBMINER_TEST_YTDLP_LOG: ytdlpLogPath,
+      SUBMINER_TEST_MPV_ORDER: mpvCapturePath,
+      SUBMINER_TEST_MPV_ARGS: mpvArgsPath,
+    };
+    const result = runLauncher(['youtube', 'https://www.youtube.com/watch?v=test123'], env);
+
+    assert.equal(result.status, 0);
+    assert.equal(fs.readFileSync(mpvCapturePath, 'utf8').trim(), 'generated-before-mpv');
+    assert.match(
+      fs.readFileSync(mpvArgsPath, 'utf8'),
+      /https:\/\/www\.youtube\.com\/watch\?v=test123/,
+    );
+    assert.match(fs.readFileSync(ytdlpLogPath, 'utf8'), /--dump-single-json/);
+  });
+});
+
 test('dictionary command forwards --dictionary and --dictionary-target to app command path', () => {
   withTempDir((root) => {
     const homeDir = path.join(root, 'home');
diff --git a/launcher/types.ts b/launcher/types.ts
index 9cfa061..88e0fa9 100644
--- a/launcher/types.ts
+++ b/launcher/types.ts
@@ -42,26 +42,38 @@ export const DEFAULT_MPV_SUBMINER_ARGS = [
 ] as const;
 
 export type LogLevel = 'debug' | 'info' | 'warn' | 'error';
-export type YoutubeSubgenMode = 'automatic' | 'preprocess' | 'off';
 export type Backend = 'auto' | 'hyprland' | 'x11' | 'macos';
 export type JimakuLanguagePreference = 'ja' | 'en' | 'none';
 
+export interface LauncherAiConfig {
+  enabled?: boolean;
+  apiKey?: string;
+  apiKeyCommand?: string;
+  baseUrl?: string;
+  model?: string;
+  systemPrompt?: string;
+  requestTimeoutMs?: number;
+}
+
 export interface Args {
   backend: Backend;
   directory: string;
   recursive: boolean;
   profile: string;
   startOverlay: boolean;
-  youtubeSubgenMode: YoutubeSubgenMode;
   whisperBin: string;
   whisperModel: string;
+  whisperVadModel: string;
+  whisperThreads: number;
   youtubeSubgenOutDir: string;
   youtubeSubgenAudioFormat: string;
   youtubeSubgenKeepTemp: boolean;
+  youtubeFixWithAi: boolean;
   youtubePrimarySubLangs: string[];
   youtubeSecondarySubLangs: string[];
   youtubeAudioLangs: string[];
   youtubeWhisperSourceLanguage: string;
+  aiConfig: LauncherAiConfig;
   useTexthooker: boolean;
   autoStartOverlay: boolean;
   texthookerOnly: boolean;
@@ -96,9 +108,12 @@ export interface Args {
 }
 
 export interface LauncherYoutubeSubgenConfig {
-  mode?: YoutubeSubgenMode;
   whisperBin?: string;
   whisperModel?: string;
+  whisperVadModel?: string;
+  whisperThreads?: number;
+  fixWithAi?: boolean;
+  ai?: LauncherAiConfig;
   primarySubLanguages?: string[];
   secondarySubLanguages?: string[];
   jimakuApiKey?: string;
@@ -144,13 +159,15 @@ export interface SubtitleCandidate {
   lang: 'primary' | 'secondary';
   ext: string;
   size: number;
-  source: 'manual' | 'auto' | 'whisper' | 'whisper-translate';
+  source: 'manual' | 'whisper' | 'whisper-fixed' | 'whisper-translate' | 'whisper-translate-fixed';
 }
 
 export interface YoutubeSubgenOutputs {
   basename: string;
   primaryPath?: string;
   secondaryPath?: string;
+  primaryNative?: boolean;
+  secondaryNative?: boolean;
 }
 
 export interface MpvTrack {
diff --git a/src/config/config.test.ts b/src/config/config.test.ts
index 612abed..9b42abe 100644
--- a/src/config/config.test.ts
+++ b/src/config/config.test.ts
@@ -34,6 +34,13 @@ test('loads defaults when config is missing', () => {
   assert.equal(config.jellyfin.remoteControlAutoConnect, true);
   assert.equal(config.jellyfin.autoAnnounce, false);
   assert.equal(config.jellyfin.remoteControlDeviceName, 'SubMiner');
+  assert.equal(config.ai.enabled, false);
+  assert.equal(config.ai.apiKeyCommand, '');
+  assert.deepEqual(config.ankiConnect.ai, {
+    enabled: false,
+    model: '',
+    systemPrompt: '',
+  });
   assert.equal(config.startupWarmups.lowPowerMode, false);
   assert.equal(config.startupWarmups.mecab, true);
   assert.equal(config.startupWarmups.yomitanExtension, true);
@@ -1068,12 +1075,20 @@ test('parses global shortcuts and startup settings', () => {
   fs.writeFileSync(
     path.join(dir, 'config.jsonc'),
     `{
+      "ai": {
+        "enabled": true,
+        "apiKeyCommand": "pass show subminer/ai",
+        "model": "openai/gpt-4o-mini"
+      },
       "shortcuts": {
         "toggleVisibleOverlayGlobal": "Alt+Shift+U",
         "openJimaku": "Ctrl+Alt+J"
       },
       "youtubeSubgen": {
-        "primarySubLanguages": ["ja", "jpn", "jp"]
+        "primarySubLanguages": ["ja", "jpn", "jp"],
+        "whisperVadModel": "/models/vad.bin",
+        "whisperThreads": 12,
+        "fixWithAi": true
       }
     }`,
     'utf-8',
@@ -1081,9 +1096,14 @@ test('parses global shortcuts and startup settings', () => {
 
   const service = new ConfigService(dir);
   const config = service.getConfig();
+  assert.equal(config.ai.enabled, true);
+  assert.equal(config.ai.apiKeyCommand, 'pass show subminer/ai');
   assert.equal(config.shortcuts.toggleVisibleOverlayGlobal, 'Alt+Shift+U');
   assert.equal(config.shortcuts.openJimaku, 'Ctrl+Alt+J');
   assert.deepEqual(config.youtubeSubgen.primarySubLanguages, ['ja', 'jpn', 'jp']);
+  assert.equal(config.youtubeSubgen.whisperVadModel, '/models/vad.bin');
+  assert.equal(config.youtubeSubgen.whisperThreads, 12);
+  assert.equal(config.youtubeSubgen.fixWithAi, true);
 });
 
 test('runtime options registry is centralized', () => {
@@ -1324,14 +1344,86 @@ test('supports legacy ankiConnect.behavior N+1 settings as fallback', () => {
   );
 });
 
-test('warns when ankiConnect.openRouter is used and migrates to ai', () => {
+test('accepts top-level ai config', () => {
+  const dir = makeTempDir();
+  fs.writeFileSync(
+    path.join(dir, 'config.jsonc'),
+    `{
+      "ai": {
+        "enabled": true,
+        "apiKey": "abc123",
+        "apiKeyCommand": "pass show subminer/ai",
+        "baseUrl": "https://openrouter.ai/api",
+        "model": "openrouter/test-model",
+        "systemPrompt": "Return only fixed subtitles.",
+        "requestTimeoutMs": 20000
+      }
+    }`,
+    'utf-8',
+  );
+
+  const service = new ConfigService(dir);
+  const config = service.getConfig();
+  assert.equal(config.ai.enabled, true);
+  assert.equal(config.ai.apiKey, 'abc123');
+  assert.equal(config.ai.apiKeyCommand, 'pass show subminer/ai');
+  assert.equal(config.ai.baseUrl, 'https://openrouter.ai/api');
+  assert.equal(config.ai.model, 'openrouter/test-model');
+  assert.equal(config.ai.systemPrompt, 'Return only fixed subtitles.');
+  assert.equal(config.ai.requestTimeoutMs, 20000);
+});
+
+test('accepts per-feature ai overrides for anki and youtube subtitle generation', () => {
+  const dir = makeTempDir();
+  fs.writeFileSync(
+    path.join(dir, 'config.jsonc'),
+    `{
+      "ai": {
+        "enabled": true,
+        "apiKeyCommand": "pass show subminer/ai",
+        "baseUrl": "https://openrouter.ai/api",
+        "model": "openrouter/shared-model",
+        "systemPrompt": "Legacy shared prompt."
+      },
+      "ankiConnect": {
+        "ai": {
+          "enabled": true,
+          "model": "openrouter/anki-model",
+          "systemPrompt": "Translate mined sentence text."
+        }
+      },
+      "youtubeSubgen": {
+        "ai": {
+          "model": "openrouter/subgen-model",
+          "systemPrompt": "Fix subtitle mistakes only."
+        }
+      }
+    }`,
+    'utf-8',
+  );
+
+  const service = new ConfigService(dir);
+  const config = service.getConfig();
+
+  assert.equal(config.ai.enabled, true);
+  assert.equal(config.ai.model, 'openrouter/shared-model');
+  assert.equal(config.ankiConnect.ai.enabled, true);
+  assert.equal(config.ankiConnect.ai.model, 'openrouter/anki-model');
+  assert.equal(config.ankiConnect.ai.systemPrompt, 'Translate mined sentence text.');
+  assert.equal(config.youtubeSubgen.ai.model, 'openrouter/subgen-model');
+  assert.equal(config.youtubeSubgen.ai.systemPrompt, 'Fix subtitle mistakes only.');
+});
+
+test('warns and falls back when ankiConnect.ai override values are invalid', () => {
   const dir = makeTempDir();
   fs.writeFileSync(
     path.join(dir, 'config.jsonc'),
     `{
       "ankiConnect": {
-        "openRouter": {
-          "model": "openrouter/test-model"
+        "ai": {
+          "enabled": "yes",
+          "model": 123,
+          "systemPrompt": true
         }
       }
     }`,
@@ -1342,13 +1434,10 @@ test('warns when ankiConnect.openRouter is used and migrates to ai', () => {
   const config = service.getConfig();
   const warnings = service.getWarnings();
 
-  assert.equal((config.ankiConnect.ai as Record<string, unknown>).model, 'openrouter/test-model');
-  assert.ok(
-    warnings.some(
-      (warning) =>
-        warning.path === 'ankiConnect.openRouter' && warning.message.includes('ankiConnect.ai'),
-    ),
-  );
+  assert.deepEqual(config.ankiConnect.ai, DEFAULT_CONFIG.ankiConnect.ai);
+  assert.ok(warnings.some((warning) => warning.path === 'ankiConnect.ai.enabled'));
+  assert.ok(warnings.some((warning) => warning.path === 'ankiConnect.ai.model'));
+  assert.ok(warnings.some((warning) => warning.path === 'ankiConnect.ai.systemPrompt'));
 });
 
 test('falls back and warns when legacy ankiConnect migration values are invalid', () => {
@@ -1547,6 +1636,7 @@ test('falls back to default when ankiConnect n+1 deck list is invalid', () => {
 
 test('template generator includes known keys', () => {
   const output = generateConfigTemplate(DEFAULT_CONFIG);
+  assert.match(output, /"ai":/);
   assert.match(output, /"ankiConnect":/);
   assert.match(output, /"logging":/);
   assert.match(output, /"websocket":/);
@@ -1577,6 +1667,31 @@ test('template generator includes known keys', () => {
     output,
     /"enabled": false,? \/\/ Enable AnkiConnect integration\. Values: true \| false/,
   );
+  assert.match(
+    output,
+    /"enabled": false,? \/\/ Enable AI provider usage for Anki translation\/enrichment flows\. Values: true \| false/,
+  );
+  assert.match(
+    output,
+    /"model": "",? \/\/ Optional model override for Anki AI translation\/enrichment flows\./,
+  );
+  assert.match(
+    output,
+    /"enabled": false,? \/\/ Enable shared OpenAI-compatible AI provider features\. Values: true \| false/,
+  );
+  assert.match(
+    output,
+    /"fixWithAi": false,? \/\/ Use shared AI provider to post-process whisper-generated YouTube subtitles\. Values: true \| false/,
+  );
+  assert.match(
+    output,
+    /"systemPrompt": "",? \/\/ Optional system prompt override for YouTube subtitle AI post-processing\./,
+  );
+  assert.doesNotMatch(output, /"mode": "automatic"/);
+  assert.match(
+    output,
+    /"whisperThreads": 4,? \/\/ Thread count passed to whisper\.cpp subtitle generation runs\./,
+  );
   assert.match(
     output,
     /"launchAtStartup": true,? \/\/ Launch texthooker server automatically when SubMiner starts\. Values: true \| false/,
diff --git a/src/config/definitions/defaults-integrations.ts b/src/config/definitions/defaults-integrations.ts
index 5765eb2..0df432b 100644
--- a/src/config/definitions/defaults-integrations.ts
+++ b/src/config/definitions/defaults-integrations.ts
@@ -2,7 +2,7 @@ import { ResolvedConfig } from '../../types';
 
 export const INTEGRATIONS_DEFAULT_CONFIG: Pick<
   ResolvedConfig,
-  'ankiConnect' | 'jimaku' | 'anilist' | 'jellyfin' | 'discordPresence' | 'youtubeSubgen'
+  'ankiConnect' | 'jimaku' | 'anilist' | 'jellyfin' | 'discordPresence' | 'ai' | 'youtubeSubgen'
 > = {
   ankiConnect: {
     enabled: false,
@@ -24,13 +24,8 @@ export const INTEGRATIONS_DEFAULT_CONFIG: Pick<
     },
     ai: {
       enabled: false,
-      alwaysUseAiTranslation: false,
-      apiKey: '',
-      model: 'openai/gpt-4o-mini',
-      baseUrl: 'https://openrouter.ai/api',
-      targetLanguage: 'English',
-      systemPrompt:
-        'You are a translation engine. Return only the translated text with no explanations.',
+      model: '',
+      systemPrompt: '',
     },
     media: {
       generateAudio: true,
@@ -122,10 +117,26 @@ export const INTEGRATIONS_DEFAULT_CONFIG: Pick<
     updateIntervalMs: 3_000,
     debounceMs: 750,
   },
+  ai: {
+    enabled: false,
+    apiKey: '',
+    apiKeyCommand: '',
+    model: 'openai/gpt-4o-mini',
+    baseUrl: 'https://openrouter.ai/api',
+    systemPrompt:
+      'You are a translation engine. Return only the translated text with no explanations.',
+    requestTimeoutMs: 15_000,
+  },
   youtubeSubgen: {
-    mode: 'automatic',
     whisperBin: '',
     whisperModel: '',
+    whisperVadModel: '',
+    whisperThreads: 4,
+    fixWithAi: false,
+    ai: {
+      model: '',
+      systemPrompt: '',
+    },
     primarySubLanguages: ['ja', 'jpn'],
   },
 };
diff --git a/src/config/definitions/options-integrations.ts b/src/config/definitions/options-integrations.ts
index 1d6f7ad..7e786ee 100644
--- a/src/config/definitions/options-integrations.ts
+++ b/src/config/definitions/options-integrations.ts
@@ -51,6 +51,24 @@ export function buildIntegrationConfigOptionRegistry(
       description:
         'Tags to add to cards mined or updated by SubMiner. Provide an empty array to disable automatic tagging.',
     },
+    {
+      path: 'ankiConnect.ai.enabled',
+      kind: 'boolean',
+      defaultValue: defaultConfig.ankiConnect.ai.enabled,
+      description: 'Enable AI provider usage for Anki translation/enrichment flows.',
+    },
+    {
+      path: 'ankiConnect.ai.model',
+      kind: 'string',
+      defaultValue: defaultConfig.ankiConnect.ai.model,
+      description: 'Optional model override for Anki AI translation/enrichment flows.',
+    },
+    {
+      path: 'ankiConnect.ai.systemPrompt',
+      kind: 'string',
+      defaultValue: defaultConfig.ankiConnect.ai.systemPrompt,
+      description: 'Optional system prompt override for Anki AI translation/enrichment flows.',
+    },
     {
       path: 'ankiConnect.behavior.autoUpdateNewCards',
       kind: 'boolean',
@@ -291,11 +309,34 @@ export function buildIntegrationConfigOptionRegistry(
       description: 'Debounce delay used to collapse bursty presence updates.',
     },
     {
-      path: 'youtubeSubgen.mode',
-      kind: 'enum',
-      enumValues: ['automatic', 'preprocess', 'off'],
-      defaultValue: defaultConfig.youtubeSubgen.mode,
-      description: 'YouTube subtitle generation mode for the launcher script.',
+      path: 'ai.enabled',
+      kind: 'boolean',
+      defaultValue: defaultConfig.ai.enabled,
+      description: 'Enable shared OpenAI-compatible AI provider features.',
+    },
+    {
+      path: 'ai.apiKey',
+      kind: 'string',
+      defaultValue: defaultConfig.ai.apiKey,
+      description: 'Static API key for the shared OpenAI-compatible AI provider.',
+    },
+    {
+      path: 'ai.apiKeyCommand',
+      kind: 'string',
+      defaultValue: defaultConfig.ai.apiKeyCommand,
+      description: 'Shell command used to resolve the shared AI provider API key.',
+    },
+    {
+      path: 'ai.baseUrl',
+      kind: 'string',
+      defaultValue: defaultConfig.ai.baseUrl,
+      description: 'Base URL for the shared OpenAI-compatible AI provider.',
+    },
+    {
+      path: 'ai.requestTimeoutMs',
+      kind: 'number',
+      defaultValue: defaultConfig.ai.requestTimeoutMs,
+      description: 'Timeout in milliseconds for shared AI provider requests.',
     },
     {
       path: 'youtubeSubgen.whisperBin',
@@ -309,6 +350,36 @@ export function buildIntegrationConfigOptionRegistry(
       defaultValue: defaultConfig.youtubeSubgen.whisperModel,
       description: 'Path to whisper model used for fallback transcription.',
     },
+    {
+      path: 'youtubeSubgen.whisperVadModel',
+      kind: 'string',
+      defaultValue: defaultConfig.youtubeSubgen.whisperVadModel,
+      description: 'Path to optional whisper VAD model used for subtitle generation.',
+    },
+    {
+      path: 'youtubeSubgen.whisperThreads',
+      kind: 'number',
+      defaultValue: defaultConfig.youtubeSubgen.whisperThreads,
+      description: 'Thread count passed to whisper.cpp subtitle generation runs.',
+    },
+    {
+      path: 'youtubeSubgen.fixWithAi',
+      kind: 'boolean',
+      defaultValue: defaultConfig.youtubeSubgen.fixWithAi,
+      description: 'Use shared AI provider to post-process whisper-generated YouTube subtitles.',
+    },
+    {
+      path: 'youtubeSubgen.ai.model',
+      kind: 'string',
+      defaultValue: defaultConfig.youtubeSubgen.ai.model,
+      description: 'Optional model override for YouTube subtitle AI post-processing.',
+    },
+    {
+      path: 'youtubeSubgen.ai.systemPrompt',
+      kind: 'string',
+      defaultValue: defaultConfig.youtubeSubgen.ai.systemPrompt,
+      description: 'Optional system prompt override for YouTube subtitle AI post-processing.',
+    },
     {
       path: 'youtubeSubgen.primarySubLanguages',
       kind: 'string',
diff --git a/src/config/definitions/template-sections.ts b/src/config/definitions/template-sections.ts
index 9c9608c..9c0dfd9 100644
--- a/src/config/definitions/template-sections.ts
+++ b/src/config/definitions/template-sections.ts
@@ -91,11 +91,19 @@ const SUBTITLE_TEMPLATE_SECTIONS: ConfigTemplateSection[] = [
 ];
 
 const INTEGRATION_TEMPLATE_SECTIONS: ConfigTemplateSection[] = [
+  {
+    title: 'Shared AI Provider',
+    description: [
+      'Canonical OpenAI-compatible provider transport settings shared by Anki and YouTube subtitle fixing.',
+    ],
+    key: 'ai',
+  },
   {
     title: 'AnkiConnect Integration',
     description: ['Automatic Anki updates and media generation options.'],
     notes: [
-      'Hot-reload: AI translation settings update live while SubMiner is running.',
+      'Hot-reload: ankiConnect.ai.enabled updates live while SubMiner is running.',
+      'Shared AI provider transport settings are read from top-level ai and typically require restart.',
       'Most other AnkiConnect settings still require restart.',
     ],
     key: 'ankiConnect',
@@ -107,7 +115,7 @@ const INTEGRATION_TEMPLATE_SECTIONS: ConfigTemplateSection[] = [
   },
   {
     title: 'YouTube Subtitle Generation',
-    description: ['Defaults for subminer YouTube subtitle extraction/transcription mode.'],
+    description: ['Defaults for SubMiner YouTube subtitle generation.'],
     key: 'youtubeSubgen',
   },
   {
diff --git a/src/config/resolve/subtitle-domains.ts b/src/config/resolve/subtitle-domains.ts
index 32f6219..2db5cb0 100644
--- a/src/config/resolve/subtitle-domains.ts
+++ b/src/config/resolve/subtitle-domains.ts
@@ -46,18 +46,6 @@ export function applySubtitleDomainConfig(context: ResolveContext): void {
   }
 
   if (isObject(src.youtubeSubgen)) {
-    const mode = src.youtubeSubgen.mode;
-    if (mode === 'automatic' || mode === 'preprocess' || mode === 'off') {
-      resolved.youtubeSubgen.mode = mode;
-    } else if (mode !== undefined) {
-      warn(
-        'youtubeSubgen.mode',
-        mode,
-        resolved.youtubeSubgen.mode,
-        'Expected automatic, preprocess, or off.',
-      );
-    }
-
     const whisperBin = asString(src.youtubeSubgen.whisperBin);
     if (whisperBin !== undefined) {
       resolved.youtubeSubgen.whisperBin = whisperBin;
@@ -82,6 +70,75 @@ export function applySubtitleDomainConfig(context: ResolveContext): void {
       );
     }
 
+    const whisperVadModel = asString(src.youtubeSubgen.whisperVadModel);
+    if (whisperVadModel !== undefined) {
+      resolved.youtubeSubgen.whisperVadModel = whisperVadModel;
+    } else if (src.youtubeSubgen.whisperVadModel !== undefined) {
+      warn(
+        'youtubeSubgen.whisperVadModel',
+        src.youtubeSubgen.whisperVadModel,
+        resolved.youtubeSubgen.whisperVadModel,
+        'Expected string.',
+      );
+    }
+
+    const whisperThreads = asNumber(src.youtubeSubgen.whisperThreads);
+    if (whisperThreads !== undefined && Number.isInteger(whisperThreads) && whisperThreads > 0) {
+      resolved.youtubeSubgen.whisperThreads = whisperThreads;
+    } else if (src.youtubeSubgen.whisperThreads !== undefined) {
+      warn(
+        'youtubeSubgen.whisperThreads',
+        src.youtubeSubgen.whisperThreads,
+        resolved.youtubeSubgen.whisperThreads,
+        'Expected positive integer.',
+      );
+    }
+
+    const fixWithAi = asBoolean(src.youtubeSubgen.fixWithAi);
+    if (fixWithAi !== undefined) {
+      resolved.youtubeSubgen.fixWithAi = fixWithAi;
+    } else if (src.youtubeSubgen.fixWithAi !== undefined) {
+      warn(
+        'youtubeSubgen.fixWithAi',
+        src.youtubeSubgen.fixWithAi,
+        resolved.youtubeSubgen.fixWithAi,
+        'Expected boolean.',
+      );
+    }
+
+    if (isObject(src.youtubeSubgen.ai)) {
+      const aiModel = asString(src.youtubeSubgen.ai.model);
+      if (aiModel !== undefined) {
+        resolved.youtubeSubgen.ai.model = aiModel;
+      } else if (src.youtubeSubgen.ai.model !== undefined) {
+        warn(
+          'youtubeSubgen.ai.model',
+          src.youtubeSubgen.ai.model,
+          resolved.youtubeSubgen.ai.model,
+          'Expected string.',
+        );
+      }
+
+      const aiSystemPrompt = asString(src.youtubeSubgen.ai.systemPrompt);
+      if (aiSystemPrompt !== undefined) {
+        resolved.youtubeSubgen.ai.systemPrompt = aiSystemPrompt;
+      } else if (src.youtubeSubgen.ai.systemPrompt !== undefined) {
+        warn(
+          'youtubeSubgen.ai.systemPrompt',
+          src.youtubeSubgen.ai.systemPrompt,
+          resolved.youtubeSubgen.ai.systemPrompt,
+          'Expected string.',
+        );
+      }
+    } else if (src.youtubeSubgen.ai !== undefined) {
+      warn(
+        'youtubeSubgen.ai',
+        src.youtubeSubgen.ai,
+        resolved.youtubeSubgen.ai,
+        'Expected object.',
+      );
+    }
+
     if (Array.isArray(src.youtubeSubgen.primarySubLanguages)) {
       resolved.youtubeSubgen.primarySubLanguages = src.youtubeSubgen.primarySubLanguages.filter(
         (item): item is string => typeof item === 'string',
diff --git a/src/core/services/overlay-runtime-init.test.ts b/src/core/services/overlay-runtime-init.test.ts
index ec487de..b51ac41 100644
--- a/src/core/services/overlay-runtime-init.test.ts
+++ b/src/core/services/overlay-runtime-init.test.ts
@@ -108,3 +108,49 @@ test('initializeOverlayRuntime starts Anki integration when ankiConnect.enabled
   assert.equal(startedIntegrations, 1);
   assert.equal(setIntegrationCalls, 1);
 });
+
+test('initializeOverlayRuntime re-syncs overlay shortcuts when tracker focus changes', () => {
+  let syncCalls = 0;
+  const tracker = {
+    onGeometryChange: null as ((...args: unknown[]) => void) | null,
+    onWindowFound: null as ((...args: unknown[]) => void) | null,
+    onWindowLost: null as (() => void) | null,
+    onWindowFocusChange: null as ((focused: boolean) => void) | null,
+    start: () => {},
+  };
+
+  initializeOverlayRuntime({
+    backendOverride: null,
+    createMainWindow: () => {},
+    registerGlobalShortcuts: () => {},
+    updateVisibleOverlayBounds: () => {},
+    isVisibleOverlayVisible: () => false,
+    updateVisibleOverlayVisibility: () => {},
+    getOverlayWindows: () => [],
+    syncOverlayShortcuts: () => {
+      syncCalls += 1;
+    },
+    setWindowTracker: () => {},
+    getMpvSocketPath: () => '/tmp/mpv.sock',
+    createWindowTracker: () => tracker as never,
+    getResolvedConfig: () => ({
+      ankiConnect: { enabled: false } as never,
+    }),
+    getSubtitleTimingTracker: () => null,
+    getMpvClient: () => null,
+    getRuntimeOptionsManager: () => null,
+    setAnkiIntegration: () => {},
+    showDesktopNotification: () => {},
+    createFieldGroupingCallback: () => async () => ({
+      keepNoteId: 1,
+      deleteNoteId: 2,
+      deleteDuplicate: false,
+      cancelled: false,
+    }),
+    getKnownWordCacheStatePath: () => '/tmp/known-words-cache.json',
+  });
+
+  assert.equal(typeof tracker.onWindowFocusChange, 'function');
+  tracker.onWindowFocusChange?.(true);
+  assert.equal(syncCalls, 1);
+});
diff --git a/src/core/services/overlay-runtime-init.ts b/src/core/services/overlay-runtime-init.ts
index 570fcbd..024e0a6 100644
--- a/src/core/services/overlay-runtime-init.ts
+++ b/src/core/services/overlay-runtime-init.ts
@@ -101,6 +101,9 @@ export function initializeOverlayRuntime(options: {
       }
       options.syncOverlayShortcuts();
     };
+    windowTracker.onWindowFocusChange = () => {
+      options.syncOverlayShortcuts();
+    };
     windowTracker.start();
   }
 
diff --git a/src/main.ts b/src/main.ts
index 1b5f038..bc03bd0 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -969,6 +969,8 @@ const overlayShortcutsRuntime = createOverlayShortcutsRuntimeService(
       appState.shortcutsRegistered = registered;
     },
     isOverlayRuntimeInitialized: () => appState.overlayRuntimeInitialized,
+    isMacOSPlatform: () => process.platform === 'darwin',
+    isTrackedMpvWindowFocused: () => appState.windowTracker?.isFocused() ?? false,
     showMpvOsd: (text: string) => showMpvOsd(text),
     openRuntimeOptionsPalette: () => {
       openRuntimeOptionsPalette();
diff --git a/src/types.ts b/src/types.ts
index 577f488..b96621e 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -227,24 +227,7 @@ export interface AnkiConnectConfig {
     miscInfo?: string;
     translation?: string;
   };
-  ai?: {
-    enabled?: boolean;
-    alwaysUseAiTranslation?: boolean;
-    apiKey?: string;
-    model?: string;
-    baseUrl?: string;
-    targetLanguage?: string;
-    systemPrompt?: string;
-  };
-  openRouter?: {
-    enabled?: boolean;
-    alwaysUseAiTranslation?: boolean;
-    apiKey?: string;
-    model?: string;
-    baseUrl?: string;
-    targetLanguage?: string;
-    systemPrompt?: string;
-  };
+  ai?: boolean | AiFeatureConfig;
   media?: {
     generateAudio?: boolean;
     generateImage?: boolean;
@@ -455,12 +438,29 @@ export interface DiscordPresenceConfig {
   debounceMs?: number;
 }
 
-export type YoutubeSubgenMode = 'automatic' | 'preprocess' | 'off';
+export interface AiFeatureConfig {
+  enabled?: boolean;
+  model?: string;
+  systemPrompt?: string;
+}
+
+export interface AiConfig {
+  enabled?: boolean;
+  apiKey?: string;
+  apiKeyCommand?: string;
+  baseUrl?: string;
+  model?: string;
+  systemPrompt?: string;
+  requestTimeoutMs?: number;
+}
 
 export interface YoutubeSubgenConfig {
-  mode?: YoutubeSubgenMode;
   whisperBin?: string;
   whisperModel?: string;
+  whisperVadModel?: string;
+  whisperThreads?: number;
+  fixWithAi?: boolean;
+  ai?: AiFeatureConfig;
   primarySubLanguages?: string[];
 }
 
@@ -498,6 +498,7 @@ export interface Config {
   anilist?: AnilistConfig;
   jellyfin?: JellyfinConfig;
   discordPresence?: DiscordPresenceConfig;
+  ai?: AiConfig;
   youtubeSubgen?: YoutubeSubgenConfig;
   immersionTracking?: ImmersionTrackingConfig;
   logging?: {
@@ -531,14 +532,8 @@ export interface ResolvedConfig {
       miscInfo: string;
       translation: string;
     };
-    ai: {
+    ai: AiFeatureConfig & {
       enabled: boolean;
-      alwaysUseAiTranslation: boolean;
-      apiKey: string;
-      model: string;
-      baseUrl: string;
-      targetLanguage: string;
-      systemPrompt: string;
     };
     media: {
       generateAudio: boolean;
@@ -649,10 +644,22 @@ export interface ResolvedConfig {
     updateIntervalMs: number;
     debounceMs: number;
   };
+  ai: AiConfig & {
+    enabled: boolean;
+    apiKey: string;
+    apiKeyCommand: string;
+    baseUrl: string;
+    model: string;
+    systemPrompt: string;
+    requestTimeoutMs: number;
+  };
   youtubeSubgen: YoutubeSubgenConfig & {
-    mode: YoutubeSubgenMode;
     whisperBin: string;
     whisperModel: string;
+    whisperVadModel: string;
+    whisperThreads: number;
+    fixWithAi: boolean;
+    ai: AiFeatureConfig;
     primarySubLanguages: string[];
   };
   immersionTracking: {