[youtube] Age-gate bypass does not work because of get_video_info returning 404

Checklist

• I’m reporting a bug report
• I’ve verified that I’m running youtube-dl version 2021.05.16
• I’ve checked that all provided URLs are alive and playable in a browser
• I’ve checked that all URLs and arguments with special characters are properly quoted or escaped
• I’ve searched the bugtracker for similar bug reports including closed ones
• I’ve read bugs section in FAQ

Verbose log

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-sv', 'Tq92D6wQ1mg']
[debug] Encodings: locale UTF-8, fs utf-8, out utf-8, pref UTF-8
[debug] youtube-dl version 2021.05.16
[debug]        from commit 9aad8cd18
[debug]           based on a72600998
[debug] Git HEAD: 8248d5fba
[debug] Python version 3.9.5 (CPython) - Linux-5.11.0-051100-generic-x86_64-with-glibc2.31
[debug] exe versions: ffmpeg 4.2.4, ffprobe 4.2.4, rtmpdump 2.4
[debug] Proxy map: {}
[youtube] Tq92D6wQ1mg: Downloading webpage
[youtube] [debug] Fetching webpage from https://www.youtube.com/watch?v=Tq92D6wQ1mg&bpctr=9999999999&has_verified=1
[youtube] trying regex ;ytplayer\.config\s*=\s*({.+?});ytplayer
[youtube] trying regex ;ytplayer\.config\s*=\s*({.+?});
[youtube] trying regex (?m)window\["ytInitialPlayerResponse"\]\s*=\s*({.+});$
[youtube] trying regex ytInitialPlayerResponse\s*=\s*({.+?})\s*;\s*(?:var\s+meta|</script|if\s*\(window\.ytcsi\)|\n)
[youtube] ytInitialPlayerResponse\s*=\s*({.+?})\s*;\s*(?:var\s+meta|</script|if\s*\(window\.ytcsi\)|\n) found
[youtube] Tq92D6wQ1mg: Refetching age-gated info webpage
[youtube] [debug] Fetching webpage from https://www.youtube.com/get_video_info?video_id=Tq92D6wQ1mg&eurl=https%3A%2F%2Fyoutube.googleapis.com%2Fv%2FTq92D6wQ1mg
WARNING: unable to download video info webpage: HTTP Error 404: Not Found
ERROR: Sign in to confirm your age
This video may be inappropriate for some users.
Traceback (most recent call last):
  File "/home/lesmi/youtube-dl/youtube_dl/YoutubeDL.py", line 876, in wrapper
    return func(self, *args, **kwargs)
  File "/home/lesmi/youtube-dl/youtube_dl/YoutubeDL.py", line 907, in __extract_info
    ie_result = ie.extract(url)
  File "/home/lesmi/youtube-dl/youtube_dl/extractor/common.py", line 553, in extract
    ie_result = self._real_extract(url)
  File "/home/lesmi/youtube-dl/youtube_dl/extractor/youtube.py", line 1743, in _real_extract
    raise ExtractorError(reason, expected=True)
youtube_dl.utils.ExtractorError: Sign in to confirm your age
This video may be inappropriate for some users.

Description

Given an age-restricted video like this one, youtube-dl used to workaround it by using get_video_info call. But it seems it’s not available anymore.

This is not lethal because when I provided --cookies option then it works normally.

[StanNieuwmans]

@colethedj

Sorry for the double post but this is the first issue a came by when i googled so:

I dont know if this helps but if you want to let get_video_info link to work for now you can add : &html5=1 to the link. You will get something like this: https://www.youtube.com/get_video_info?html5=1&video_id={videoID}.

[Lesmiscore]

I rewrote the code to use innertube instead, and age-gate bypassing worked for embeddedable videos. It’ll fail if the video can’t be embedded, since it’s mimicking embedded client. https://github.com/ytdl-patched/ytdl-patched/commit/7371d30ec1040afcbe94b3d6ff1a28b137dc65b5