[ie/youtube] Avoid poToken experiment player responses (#10456)

Closes #10397
Authored by: seproDev

yt_dlp/extractor/youtube.py

@@ -1294,6 +1294,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
         '401': {'ext': 'mp4', 'height': 2160, 'format_note': 'DASH video', 'vcodec': 'av01.0.12M.08'},
     }
     _SUBTITLE_FORMATS = ('json3', 'srv1', 'srv2', 'srv3', 'ttml', 'vtt')
+    _POTOKEN_EXPERIMENTS = ('51217476', '51217102')
 
     _GEO_BYPASS = False
 
@@ -3703,6 +3704,13 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
     def _extract_player_responses(self, clients, video_id, webpage, master_ytcfg, smuggled_data):
         initial_pr = None
         if webpage:
+            experiments = traverse_obj(master_ytcfg, (
+                'WEB_PLAYER_CONTEXT_CONFIGS', ..., 'serializedExperimentIds', {str}, {lambda x: x.split(',')}, ..., {str}))
+            if all(x in experiments for x in self._POTOKEN_EXPERIMENTS):
+                self.report_warning(
+                    'Webpage contains broken formats (poToken experiment detected). Ignoring initial player response')
+                master_ytcfg = self._get_default_ytcfg()
+            else:
                 initial_pr = self._search_json(
                     self._YT_INITIAL_PLAYER_RESPONSE_RE, webpage, 'initial player response', video_id, fatal=False)
 
@@ -3746,11 +3754,22 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
                 player_url = self._download_player_url(video_id)
                 tried_iframe_fallback = True
 
+            pr = initial_pr if client == 'web' and initial_pr else None
+            for retry in self.RetryManager(fatal=False):
                 try:
-                pr = initial_pr if client == 'web' and initial_pr else self._extract_player_response(
+                    pr = pr or self._extract_player_response(
-                    client, video_id, player_ytcfg or master_ytcfg, player_ytcfg, player_url if require_js_player else None, initial_pr, smuggled_data)
+                        client, video_id, player_ytcfg or master_ytcfg, player_ytcfg,
+                        player_url if require_js_player else None, initial_pr, smuggled_data)
                 except ExtractorError as e:
                     self.report_warning(e)
+                    break
+                experiments = traverse_obj(pr, (
+                    'responseContext', 'serviceTrackingParams', lambda _, v: v['service'] == 'GFEEDBACK',
+                    'params', lambda _, v: v['key'] == 'e', 'value', {lambda x: x.split(',')}, ..., {str}))
+                if all(x in experiments for x in self._POTOKEN_EXPERIMENTS):
+                    pr = None
+                    retry.error = ExtractorError('API returned broken formats (poToken experiment detected)', expected=True)
+            if not pr:
                 continue
 
             if pr_id := self._invalid_player_response(pr, video_id):