Youtube video with starting with `0x` id is not downloadable

[omidraha]

Videos with 0x in starting of ids are not downloadable.

For example:

https://www.youtube.com/watch?v=0x-NiAFXXL4

$ youtube-dl 0x-NiAFXXL4

or

$ youtube-dl https://www.youtube.com/watch?v=0x-NiAFXXL4

Info:

$ youtube-dl --version
2018.03.14

Trackback:

[youtube] {22} signature length 40.41, html5 player None
[youtube] 0x-NiAFXXL4: Downloading player https://www.youtube.com/yts/jsbin/player_ias-vflSzU_20/en_US/base.js
ERROR: Signature extraction failed: Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/youtube.py", line 1191, in _decrypt_signature
    video_id, player_url, s
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/youtube.py", line 1102, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/youtube.py", line 1163, in _parse_sig_js
    jscode, 'Initial JS player signature function name', group='sig')
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/common.py", line 796, in _search_regex
    raise RegexNotFoundError('Unable to extract %s' % _name)
youtube_dl.utils.RegexNotFoundError: Unable to extract Initial JS player signature function name; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
 (caused by RegexNotFoundError('Unable to extract \x1b[0;34mInitial JS player signature function name\x1b[0m; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.',)); please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/youtube.py", line 1191, in _decrypt_signature
    video_id, player_url, s
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/youtube.py", line 1102, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/youtube.py", line 1163, in _parse_sig_js
    jscode, 'Initial JS player signature function name', group='sig')
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/common.py", line 796, in _search_regex
    raise RegexNotFoundError('Unable to extract %s' % _name)
youtube_dl.utils.RegexNotFoundError: Unable to extract Initial JS player signature function name; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/youtube.py", line 1191, in _decrypt_signature
    video_id, player_url, s
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/youtube.py", line 1102, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/youtube.py", line 1163, in _parse_sig_js
    jscode, 'Initial JS player signature function name', group='sig')
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/common.py", line 796, in _search_regex
    raise RegexNotFoundError('Unable to extract %s' % _name)
youtube_dl.utils.RegexNotFoundError: Unable to extract Initial JS player signature function name; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how 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 "/usr/lib/python3/dist-packages/youtube_dl/YoutubeDL.py", line 785, in extract_info
    ie_result = ie.extract(url)
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/common.py", line 440, in extract
    ie_result = self._real_extract(url)
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/youtube.py", line 1899, in _real_extract
    encrypted_sig, video_id, player_url, age_gate)
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/youtube.py", line 1201, in _decrypt_signature
    'Signature extraction failed: ' + tb, cause=e)
youtube_dl.utils.ExtractorError: Signature extraction failed: Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/youtube.py", line 1191, in _decrypt_signature
    video_id, player_url, s
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/youtube.py", line 1102, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/youtube.py", line 1163, in _parse_sig_js
    jscode, 'Initial JS player signature function name', group='sig')
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/common.py", line 796, in _search_regex
    raise RegexNotFoundError('Unable to extract %s' % _name)
youtube_dl.utils.RegexNotFoundError: Unable to extract Initial JS player signature function name; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
 (caused by RegexNotFoundError('Unable to extract \x1b[0;34mInitial JS player signature function name\x1b[0m; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.',)); please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.

Related issues: #4800, #2970, #17012

[omidraha]

Fixed by upgrading from 2018.03.14 to 2018.12.17.