[youtube] Improve age-gated videos extraction in 429 error conditions (refs #24283)

youtube_dl/extractor/youtube.py

@@ -1726,6 +1726,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
         embed_webpage = None
         if re.search(r'player-age-gate-content">', video_webpage) is not None:
             age_gate = True
+            video_info = None
             # We simulate the access to the video from www.youtube.com/v/{video_id}
             # this can be viewed without login into Youtube
             url = proto + '://www.youtube.com/embed/%s' % video_id
@@ -1737,10 +1738,14 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
                     r'"sts"\s*:\s*(\d+)', embed_webpage, 'sts', default=''),
             })
             video_info_url = proto + '://www.youtube.com/get_video_info?' + data
+            try:
                 video_info_webpage = self._download_webpage(
                     video_info_url, video_id,
                     note='Refetching age-gated info webpage',
                     errnote='unable to download video info webpage')
+            except ExtractorError:
+                video_info_webpage = None
+            if video_info_webpage:
                 video_info = compat_parse_qs(video_info_webpage)
                 pl_response = video_info.get('player_response', [None])[0]
                 player_response = extract_player_response(pl_response, video_id)