- tracks = video_data.get('tracks')
- if tracks and isinstance(tracks, list):
- for track in tracks:
- if not isinstance(track, dict):
- continue
- track_kind = track.get('kind')
- if not track_kind or not isinstance(track_kind, str):
- continue
- if track_kind.lower() not in ('captions', 'subtitles'):
- continue
- track_url = urljoin(base_url, track.get('file'))
- if not track_url:
- continue
- subtitles.setdefault(track.get('label') or 'en', []).append({
- 'url': self._proto_relative_url(track_url)
- })
+ for track in traverse_obj(video_data, (
+ 'tracks', lambda _, v: v['kind'].lower() in ('captions', 'subtitles'))):
+ track_url = urljoin(base_url, track.get('file'))
+ if not track_url:
+ continue
+ subtitles.setdefault(track.get('label') or 'en', []).append({
+ 'url': self._proto_relative_url(track_url)
+ })