[ie/youtube] Add tv_downgraded client (#14887)

Authored by: seproDev

README.md

@@ -1840,7 +1840,7 @@ The following extractors use this feature:
 #### youtube
 * `lang`: Prefer translated metadata (`title`, `description` etc) of this language code (case-sensitive). By default, the video primary language metadata is preferred, with a fallback to `en` translated. See [youtube/_base.py](https://github.com/yt-dlp/yt-dlp/blob/415b4c9f955b1a0391204bd24a7132590e7b3bdb/yt_dlp/extractor/youtube/_base.py#L402-L409) for the list of supported content language codes
 * `skip`: One or more of `hls`, `dash` or `translated_subs` to skip extraction of the m3u8 manifests, dash manifests and [auto-translated subtitles](https://github.com/yt-dlp/yt-dlp/issues/4090#issuecomment-1158102032) respectively
-* `player_client`: Clients to extract video data from. The currently available clients are `web`, `web_safari`, `web_embedded`, `web_music`, `web_creator`, `mweb`, `ios`, `android`, `android_sdkless`, `android_vr`, `tv`, `tv_simply` and `tv_embedded`. By default, `tv,android_sdkless,web` is used. If no JavaScript runtime is available, then `android_sdkless,web_safari,web` is used. If logged-in cookies are passed to yt-dlp, then `tv,web_safari,web` is used for free accounts and `tv,web_creator,web` is used for premium accounts. The `web_music` client is added for `music.youtube.com` URLs when logged-in cookies are used. The `web_embedded` client is added for age-restricted videos but only works if the video is embeddable. The `tv_embedded` and `web_creator` clients are added for age-restricted videos if account age-verification is required. Some clients, such as `web` and `web_music`, require a `po_token` for their formats to be downloadable. Some clients, such as `web_creator`, will only work with authentication. Not all clients support authentication via cookies. You can use `default` for the default clients, or you can use `all` for all clients (not recommended). You can prefix a client with `-` to exclude it, e.g. `youtube:player_client=default,-ios`
+* `player_client`: Clients to extract video data from. The currently available clients are `web`, `web_safari`, `web_embedded`, `web_music`, `web_creator`, `mweb`, `ios`, `android`, `android_sdkless`, `android_vr`, `tv`, `tv_simply`, `tv_downgraded`, and `tv_embedded`. By default, `tv,android_sdkless,web` is used. If no JavaScript runtime is available, then `android_sdkless,web_safari,web` is used. If logged-in cookies are passed to yt-dlp, then `tv_downgraded,web_safari,web` is used for free accounts and `tv_downgraded,web_creator,web` is used for premium accounts. The `web_music` client is added for `music.youtube.com` URLs when logged-in cookies are used. The `web_embedded` client is added for age-restricted videos but only works if the video is embeddable. The `tv_embedded` and `web_creator` clients are added for age-restricted videos if account age-verification is required. Some clients, such as `web` and `web_music`, require a `po_token` for their formats to be downloadable. Some clients, such as `web_creator`, will only work with authentication. Not all clients support authentication via cookies. You can use `default` for the default clients, or you can use `all` for all clients (not recommended). You can prefix a client with `-` to exclude it, e.g. `youtube:player_client=default,-ios`
 * `player_skip`: Skip some network requests that are generally needed for robust extraction. One or more of `configs` (skip client configs), `webpage` (skip initial webpage), `js` (skip js player), `initial_data` (skip initial data/next ep request). While these options can help reduce the number of requests needed or avoid some rate-limiting, they could cause issues such as missing formats or metadata.  See [#860](https://github.com/yt-dlp/yt-dlp/pull/860) and [#12826](https://github.com/yt-dlp/yt-dlp/issues/12826) for more details
 * `webpage_skip`: Skip extraction of embedded webpage data. One or both of `player_response`, `initial_data`. These options are for testing purposes and don't skip any network requests
 * `player_params`: YouTube player parameters to use for player requests. Will overwrite any default ones set by yt-dlp.

yt_dlp/extractor/youtube/_base.py

@@ -327,6 +327,17 @@ INNERTUBE_CLIENTS = {
         # See: https://github.com/youtube/cobalt/blob/main/cobalt/browser/user_agent/user_agent_platform_info.cc#L506
         'AUTHENTICATED_USER_AGENT': 'Mozilla/5.0 (ChromiumStylePlatform) Cobalt/25.lts.30.1034943-gold (unlike Gecko), Unknown_TV_Unknown_0/Unknown (Unknown, Unknown)',
     },
+    'tv_downgraded': {
+        'INNERTUBE_CONTEXT': {
+            'client': {
+                'clientName': 'TVHTML5',
+                'clientVersion': '4',
+                'userAgent': 'Mozilla/5.0 (ChromiumStylePlatform) Cobalt/Version',
+            },
+        },
+        'INNERTUBE_CONTEXT_CLIENT_NAME': 7,
+        'SUPPORTS_COOKIES': True,
+    },
     'tv_simply': {
         'INNERTUBE_CONTEXT': {
             'client': {

yt_dlp/extractor/youtube/_video.py

@@ -147,9 +147,9 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
     _SUBTITLE_FORMATS = ('json3', 'srv1', 'srv2', 'srv3', 'ttml', 'srt', 'vtt')
     _DEFAULT_CLIENTS = ('tv', 'android_sdkless', 'web')
     _DEFAULT_JSLESS_CLIENTS = ('android_sdkless', 'web_safari', 'web')
-    _DEFAULT_AUTHED_CLIENTS = ('tv', 'web_safari', 'web')
+    _DEFAULT_AUTHED_CLIENTS = ('tv_downgraded', 'web_safari', 'web')
     # Premium does not require POT (except for subtitles)
-    _DEFAULT_PREMIUM_CLIENTS = ('tv', 'web_creator', 'web')
+    _DEFAULT_PREMIUM_CLIENTS = ('tv_downgraded', 'web_creator', 'web')
 
     _GEO_BYPASS = False