remove yt-dlp, fix captions PO Token issue, fix 429 retry logic

- Remove yt-dlp entirely (modules, routes, settings, dependency)
  Was blocking page loads by running synchronously in gevent
- Fix captions: use Android client caption URLs (no PO Token needed)
  instead of web timedtext URLs that YouTube now blocks
- Fix 429 retry: fail immediately without Tor (same IP = pointless retry)
  Was causing ~27s delays with exponential backoff
- Accept ytdlp_enabled as legacy setting to avoid warning on startup

youtube/watch.py

@@ -180,8 +180,34 @@ def make_caption_src(info, lang, auto=False, trans_lang=None):
         label += ' (Automatic)'
     if trans_lang:
         label += ' -> ' + trans_lang
+
+    # Try to use Android caption URL directly (no PO Token needed)
+    caption_url = None
+    for track in info.get('_android_caption_tracks', []):
+        track_lang = track.get('languageCode', '')
+        track_kind = track.get('kind', '')
+        if track_lang == lang and (
+            (auto and track_kind == 'asr') or
+            (not auto and track_kind != 'asr')
+        ):
+            caption_url = track.get('baseUrl')
+            break
+
+    if caption_url:
+        # Add format
+        if '&fmt=' in caption_url:
+            caption_url = re.sub(r'&fmt=[^&]*', '&fmt=vtt', caption_url)
+        else:
+            caption_url += '&fmt=vtt'
+        if trans_lang:
+            caption_url += '&tlang=' + trans_lang
+        url = util.prefix_url(caption_url)
+    else:
+        # Fallback to old method
+        url = util.prefix_url(yt_data_extract.get_caption_url(info, lang, 'vtt', auto, trans_lang))
+
     return {
-        'url': util.prefix_url(yt_data_extract.get_caption_url(info, lang, 'vtt', auto, trans_lang)),
+        'url': url,
         'label': label,
         'srclang': trans_lang[0:2] if trans_lang else lang[0:2],
         'on': False,
@@ -387,6 +413,19 @@ def extract_info(video_id, use_invidious, playlist_id=None, index=None):
     info = tasks[0].value or {}
     player_response = tasks[1].value or {}
 
+    # Save android_vr caption tracks (no PO Token needed for these URLs)
+    if isinstance(player_response, str):
+        try:
+            pr_data = json.loads(player_response)
+        except Exception:
+            pr_data = {}
+    else:
+        pr_data = player_response or {}
+    android_caption_tracks = yt_data_extract.deep_get(
+        pr_data, 'captions', 'playerCaptionsTracklistRenderer',
+        'captionTracks', default=[])
+    info['_android_caption_tracks'] = android_caption_tracks
+
     yt_data_extract.update_with_new_urls(info, player_response)
 
     # Fallback to 'ios' if no valid URLs are found
@@ -696,30 +735,6 @@ def get_watch_page(video_id=None):
     pair_sources = source_info['pair_sources']
     uni_idx, pair_idx = source_info['uni_idx'], source_info['pair_idx']
 
-    # Extract audio tracks using yt-dlp for multi-language support
-    audio_tracks = []
-    try:
-        from youtube import ytdlp_integration
-        logger.info(f'Extracting audio tracks for video: {video_id}')
-        ytdlp_info = ytdlp_integration.extract_video_info_ytdlp(video_id)
-        audio_tracks = ytdlp_info.get('audio_tracks', [])
-
-        if audio_tracks:
-            logger.info(f'✓ Found {len(audio_tracks)} audio tracks:')
-            for i, track in enumerate(audio_tracks[:10], 1):  # Log first 10
-                logger.info(f'  [{i}] {track["language_name"]} ({track["language"]}) - '
-                          f'bitrate: {track.get("audio_bitrate", "N/A")}k, '
-                          f'codec: {track.get("acodec", "N/A")}, '
-                          f'format_id: {track.get("format_id", "N/A")}')
-            if len(audio_tracks) > 10:
-                logger.info(f'  ... and {len(audio_tracks) - 10} more')
-        else:
-            logger.warning(f'No audio tracks found for video {video_id}')
-
-    except Exception as e:
-        logger.error(f'Failed to extract audio tracks: {e}', exc_info=True)
-        audio_tracks = []
-
     pair_quality = yt_data_extract.deep_get(pair_sources, pair_idx, 'quality')
     uni_quality = yt_data_extract.deep_get(uni_sources, uni_idx, 'quality')
 
@@ -843,9 +858,7 @@ def get_watch_page(video_id=None):
             'playlist': info['playlist'],
             'related': info['related_videos'],
             'playability_error': info['playability_error'],
-            'audio_tracks': audio_tracks,
         },
-        audio_tracks = audio_tracks,
         font_family = youtube.font_choices[settings.font], # for embed page
         **source_info,
         using_pair_sources = using_pair_sources,
@@ -854,16 +867,13 @@ def get_watch_page(video_id=None):
 
 @yt_app.route('/api/<path:dummy>')
 def get_captions(dummy):
+    url = 'https://www.youtube.com' + request.full_path
     try:
-        result = util.fetch_url('https://www.youtube.com' + request.full_path)
+        result = util.fetch_url(url, headers=util.mobile_ua)
         result = result.replace(b"align:start position:0%", b"")
-        return result
-    except util.FetchError as e:
-        # Return empty captions gracefully instead of error page
-        logger.warning(f'Failed to fetch captions: {e}')
-        return flask.Response(b'WEBVTT\n\n', mimetype='text/vtt', status=200)
+        return flask.Response(result, mimetype='text/vtt')
     except Exception as e:
-        logger.error(f'Unexpected error fetching captions: {e}')
+        logger.debug(f'Caption fetch failed: {e}')
         return flask.Response(b'WEBVTT\n\n', mimetype='text/vtt', status=200)
 
 
@@ -929,18 +939,3 @@ def get_transcript(caption_path):
 
     return flask.Response(result.encode('utf-8'),
                           mimetype='text/plain;charset=UTF-8')
-
-
-# ============================================================================
-# yt-dlp Integration Routes
-# ============================================================================
-
-@yt_app.route('/ytl-api/video-with-audio/<video_id>')
-def proxy_video_with_audio(video_id):
-    """
-    Proxy para servir video con audio específico usando yt-dlp
-    """
-    from youtube import ytdlp_proxy
-    audio_lang = request.args.get('lang', 'en')
-    max_quality = int(request.args.get('quality', 720))
-    return ytdlp_proxy.stream_video_with_audio(video_id, audio_lang, max_quality)