[youtube] Fix multifeed extraction (closes #18531)

youtube_dl/extractor/youtube.py

@@ -1712,11 +1712,16 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
             else:
                 video_description = ''
 
-        if 'multifeed_metadata_list' in video_info and not smuggled_data.get('force_singlefeed', False):
+        if not smuggled_data.get('force_singlefeed', False):
             if not self._downloader.params.get('noplaylist'):
+                multifeed_metadata_list = try_get(
+                    player_response,
+                    lambda x: x['multicamera']['playerLegacyMulticameraRenderer']['metadataList'],
+                    compat_str) or try_get(
+                    video_info, lambda x: x['multifeed_metadata_list'][0], compat_str)
+                if multifeed_metadata_list:
                     entries = []
                     feed_ids = []
-                multifeed_metadata_list = video_info['multifeed_metadata_list'][0]
                     for feed in multifeed_metadata_list.split(','):
                         # Unquote should take place before split on comma (,) since textual
                         # fields may contain comma as well (see
@@ -1735,6 +1740,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
                         'Downloading multifeed video (%s) - add --no-playlist to just download video %s'
                         % (', '.join(feed_ids), video_id))
                     return self.playlist_result(entries, video_id, video_title, video_description)
+            else:
                 self.to_screen('Downloading just video %s because of --no-playlist' % video_id)
 
         if view_count is None: