[brightcove] Extract subtitles from manifests

yt_dlp/extractor/brightcove.py

@@ -472,7 +472,7 @@ class BrightcoveNewIE(AdobePassIE):
         title = json_data['name'].strip()
 
         num_drm_sources = 0
-        formats = []
+        formats, subtitles = [], {}
         sources = json_data.get('sources') or []
         for source in sources:
             container = source.get('container')
@@ -488,12 +488,16 @@ class BrightcoveNewIE(AdobePassIE):
             elif ext == 'm3u8' or container == 'M2TS':
                 if not src:
                     continue
-                formats.extend(self._extract_m3u8_formats(
+                f, subs = self._extract_m3u8_formats_and_subtitles(
-                    src, video_id, 'mp4', 'm3u8_native', m3u8_id='hls', fatal=False))
+                    src, video_id, 'mp4', 'm3u8_native', m3u8_id='hls', fatal=False)
+                formats.extend(f)
+                subtitles = self._merge_subtitles(subtitles, subs)
             elif ext == 'mpd':
                 if not src:
                     continue
-                formats.extend(self._extract_mpd_formats(src, video_id, 'dash', fatal=False))
+                f, subs = self._extract_mpd_formats_and_subtitles(src, video_id, 'dash', fatal=False)
+                formats.extend(f)
+                subtitles = self._merge_subtitles(subtitles, subs)
             else:
                 streaming_src = source.get('streaming_src')
                 stream_name, app_name = source.get('stream_name'), source.get('app_name')
@@ -556,7 +560,6 @@ class BrightcoveNewIE(AdobePassIE):
         for f in formats:
             f.setdefault('http_headers', {}).update(headers)
 
-        subtitles = {}
         for text_track in json_data.get('text_tracks', []):
             if text_track.get('kind') != 'captions':
                 continue