[youtube] Temporary fix for age-gate

Related:
https://stackoverflow.com/a/67629882
https://github.com/yt-dlp/yt-dlp/issues/319
https://github.com/ytdl-org/youtube-dl/issues/29333
https://github.com/ytdl-org/youtube-dl/issues/29086

yt_dlp/extractor/youtube.py

@@ -1876,6 +1876,16 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
             'comment_count': len(comments),
         }
 
+    @staticmethod
+    def _get_video_info_params(video_id):
+        return {
+            'video_id': video_id,
+            'eurl': 'https://youtube.googleapis.com/v/' + video_id,
+            'html5': '1',
+            'c': 'TVHTML5',
+            'cver': '6.20180913',
+        }
+
     def _real_extract(self, url):
         url, smuggled_data = unsmuggle_url(url, {})
         video_id = self._match_id(url)
@@ -1908,13 +1918,11 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
                     base_url + 'get_video_info', video_id,
                     'Fetching youtube music info webpage',
                     'unable to download youtube music info webpage', query={
-                        'video_id': video_id,
+                        **self._get_video_info_params(video_id),
-                        'eurl': 'https://youtube.googleapis.com/v/' + video_id,
                         'el': 'detailpage',
                         'c': 'WEB_REMIX',
                         'cver': '0.1',
                         'cplayer': 'UNIPLAYER',
-                        'html5': '1',
                     }, fatal=False)),
                 lambda x: x['player_response'][0],
                 compat_str) or '{}', video_id)
@@ -1936,12 +1944,8 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
             pr = self._parse_json(try_get(compat_parse_qs(
                 self._download_webpage(
                     base_url + 'get_video_info', video_id,
-                    'Refetching age-gated info webpage',
+                    'Refetching age-gated info webpage', 'unable to download video info webpage',
-                    'unable to download video info webpage', query={
+                    query=self._get_video_info_params(video_id), fatal=False)),
-                        'video_id': video_id,
-                        'eurl': 'https://youtube.googleapis.com/v/' + video_id,
-                        'html5': '1',
-                    }, fatal=False)),
                 lambda x: x['player_response'][0],
                 compat_str) or '{}', video_id)
             if pr: