Recent changes to Vimeo break yt-dl support with unlisted videos

Checklist

• I’m reporting a broken site support
• I’ve verified that I’m running youtube-dl version 2021.03.03
• 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 issues including closed ones

Verbose log

youtube-dl https://vimeo.com/304887422/34c51f7a09 -v
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['https://vimeo.com/304887422/34c51f7a09', '-v']
[debug] Encodings: locale cp1252, fs mbcs, out cp437, pref cp1252
[debug] youtube-dl version 2021.03.03
[debug] Python version 3.4.4 (CPython) - Windows-10-10.0.19041
[debug] exe versions: ffmpeg 4.2.1, ffprobe 4.2.1
[debug] Proxy map: {}
[vimeo] 304887422: Downloading webpage
[vimeo] 304887422: Extracting information
ERROR: Unable to extract info section (caused by ValueError('Extra data: line 1 column 3 - line 1 column 104 (char 2 - 103)',)); please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
Traceback (most recent call last):
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpvjygsik_\build\youtube_dl\extractor\vimeo.py", line 644, in _real_extract
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpvjygsik_\build\youtube_dl\extractor\common.py", line 1010, in _search_regex
youtube_dl.utils.RegexNotFoundError: Unable to extract page config; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpvjygsik_\build\youtube_dl\extractor\vimeo.py", line 665, in _real_extract
  File "C:\Python\Python34\lib\json\__init__.py", line 318, in loads
  File "C:\Python\Python34\lib\json\decoder.py", line 346, in decode
ValueError: Extra data: line 1 column 3 - line 1 column 104 (char 2 - 103)
Traceback (most recent call last):
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpvjygsik_\build\youtube_dl\extractor\vimeo.py", line 644, in _real_extract
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpvjygsik_\build\youtube_dl\extractor\common.py", line 1010, in _search_regex
youtube_dl.utils.RegexNotFoundError: Unable to extract page config; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpvjygsik_\build\youtube_dl\extractor\vimeo.py", line 665, in _real_extract
  File "C:\Python\Python34\lib\json\__init__.py", line 318, in loads
  File "C:\Python\Python34\lib\json\decoder.py", line 346, in decode
ValueError: Extra data: line 1 column 3 - line 1 column 104 (char 2 - 103)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpvjygsik_\build\youtube_dl\YoutubeDL.py", line 806, in wrapper
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpvjygsik_\build\youtube_dl\YoutubeDL.py", line 827, in __extract_info
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpvjygsik_\build\youtube_dl\extractor\common.py", line 532, in extract
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpvjygsik_\build\youtube_dl\extractor\vimeo.py", line 678, in _real_extract
youtube_dl.utils.ExtractorError: Unable to extract info section (caused by ValueError('Extra data: line 1 column 3 - line 1 column 104 (char 2 - 103)',)); please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.

Description

Example (this isn’t the video I wanted to download but my video is Patreon aka paysite content, this video reproduces the problem I have): https://vimeo.com/304887422/34c51f7a09

These types of videos are “unlisted” videos with the extra hash segment after the last forward-slash in the URL. It’s different from password-protected videos. They worked fine as recently as a week ago, so I guess something changed on vimeo. With that said, the workaround from #27591 works in this situation, but that still isn’t an ideal way to timeshift more than one or two videos, is there a way this can be corrected in the vimeo plugin?

[csillag]

Are there any developments around this? I am seeing this problem with more and more videos.

[october262]

player.vimeo.com/video/123456789

with this link - player.vimeo.com/video/123456789 and this one - player.vimeo.com/video/123456789?autoplay=1 i get video does not exist.