Downloading js player vfl49f_g4 ; ERROR: Signature extraction failed ; RegexNotFoundError('Unable to extract %s' % _name) #17148

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opened 2026-02-21 09:21:30 -05:00 by deekerman · 1 comment

deekerman commented

2026-02-21 09:21:30 -05:00

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Originally created by @Golutazem on GitHub (Jun 24, 2019).

Using current git head version 2e11e51c041bd95dd1305af5b958abacc27f39f7
2019.05.20 and also 2019.05.11.

Attempting to retrieve information about or to download some videos results in the message
Downloading js player vfl49f_g4
and the error

ERROR: Signature extraction failed: Traceback (most recent call last):
  File "/usr/lib/python3.7/site-packages/youtube_dl/extractor/youtube.py", line 1342, in _decrypt_signature
    video_id, player_url, s
  File "/usr/lib/python3.7/site-packages/youtube_dl/extractor/youtube.py", line 1250, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "/usr/lib/python3.7/site-packages/youtube_dl/extractor/youtube.py", line 1314, in _parse_sig_js
    jscode, 'Initial JS player signature function name', group='sig')
  File "/usr/lib/python3.7/site-packages/youtube_dl/extractor/common.py", line 1004, in _search_regex
    raise RegexNotFoundError('Unable to extract %s' % _name)
youtube_dl.utils.RegexNotFoundError: Unable to extract Initial JS player signature function name;

One such video is
https://www.youtube.com/watch?v=OyBNmecVtdU

Here is a verbose log:

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-vF', 'https://www.youtube.com/watch?v=OyBNmecVtdU']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2019.05.20
[debug] Python version 3.7.3 (CPython) - Linux-5.1.4
[debug] exe versions: ffmpeg 4.1.3, ffprobe 4.1.3, phantomjs 2.1.1, rtmpdump 2.4
[debug] Proxy map: {}
[youtube] OyBNmecVtdU: Downloading webpage
[youtube] OyBNmecVtdU: Downloading video info webpage
[youtube] {22} signature length 104, html5 player vfl49f_g4
[youtube] OyBNmecVtdU: Downloading player https://www.youtube.com/yts/jsbin/player_ias-vfl49f_g4/en_US/base.js
ERROR: Signature extraction failed: Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 1342, in _decrypt_signature
    video_id, player_url, s
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 1250, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 1314, in _parse_sig_js
    jscode, 'Initial JS player signature function name', group='sig')
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 1005, 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; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
 (caused by 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; type  youtube-dl -U  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; 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 "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 1342, in _decrypt_signature
    video_id, player_url, s
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 1250, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 1314, in _parse_sig_js
    jscode, 'Initial JS player signature function name', group='sig')
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 1005, 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; 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 "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 1342, in _decrypt_signature
    video_id, player_url, s
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 1250, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 1314, in _parse_sig_js
    jscode, 'Initial JS player signature function name', group='sig')
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 1005, 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; 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 "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 796, in extract_info
    ie_result = ie.extract(url)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 530, in extract
    ie_result = self._real_extract(url)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 1986, in _real_extract
    encrypted_sig, video_id, player_url, age_gate)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 1352, in _decrypt_signature
    'Signature extraction failed: ' + tb, cause=e)
youtube_dl.utils.ExtractorError: Signature extraction failed: Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 1342, in _decrypt_signature
    video_id, player_url, s
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 1250, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 1314, in _parse_sig_js
    jscode, 'Initial JS player signature function name', group='sig')
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 1005, in _search_regex
    raise RegexNotFoundError('Unable to extract %s' % _name)
youtube_dl.utils.RegexNotFoundError: Unable to extract Initial JS player signature function name;

Originally created by @Golutazem on GitHub (Jun 24, 2019). Using current git head version `2e11e51c041bd95dd1305af5b958abacc27f39f7` 2019.05.20 and also 2019.05.11. Attempting to retrieve information about or to download some videos results in the message Downloading js player vfl49f_g4 and the error ``` ERROR: Signature extraction failed: Traceback (most recent call last): File "/usr/lib/python3.7/site-packages/youtube_dl/extractor/youtube.py", line 1342, in _decrypt_signature video_id, player_url, s File "/usr/lib/python3.7/site-packages/youtube_dl/extractor/youtube.py", line 1250, in _extract_signature_function res = self._parse_sig_js(code) File "/usr/lib/python3.7/site-packages/youtube_dl/extractor/youtube.py", line 1314, in _parse_sig_js jscode, 'Initial JS player signature function name', group='sig') File "/usr/lib/python3.7/site-packages/youtube_dl/extractor/common.py", line 1004, in _search_regex raise RegexNotFoundError('Unable to extract %s' % _name) youtube_dl.utils.RegexNotFoundError: Unable to extract Initial JS player signature function name; ``` One such video is `https://www.youtube.com/watch?v=OyBNmecVtdU` Here is a verbose log: ``` [debug] System config: [] [debug] User config: [] [debug] Custom config: [] [debug] Command-line args: ['-vF', 'https://www.youtube.com/watch?v=OyBNmecVtdU'] [debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8 [debug] youtube-dl version 2019.05.20 [debug] Python version 3.7.3 (CPython) - Linux-5.1.4 [debug] exe versions: ffmpeg 4.1.3, ffprobe 4.1.3, phantomjs 2.1.1, rtmpdump 2.4 [debug] Proxy map: {} [youtube] OyBNmecVtdU: Downloading webpage [youtube] OyBNmecVtdU: Downloading video info webpage [youtube] {22} signature length 104, html5 player vfl49f_g4 [youtube] OyBNmecVtdU: Downloading player https://www.youtube.com/yts/jsbin/player_ias-vfl49f_g4/en_US/base.js ERROR: Signature extraction failed: Traceback (most recent call last): File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 1342, in _decrypt_signature video_id, player_url, s File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 1250, in _extract_signature_function res = self._parse_sig_js(code) File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 1314, in _parse_sig_js jscode, 'Initial JS player signature function name', group='sig') File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 1005, 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; type youtube-dl -U to update. Be sure to call youtube-dl with the --verbose flag and include its complete output. (caused by 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; type youtube-dl -U 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; 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 "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 1342, in _decrypt_signature video_id, player_url, s File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 1250, in _extract_signature_function res = self._parse_sig_js(code) File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 1314, in _parse_sig_js jscode, 'Initial JS player signature function name', group='sig') File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 1005, 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; 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 "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 1342, in _decrypt_signature video_id, player_url, s File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 1250, in _extract_signature_function res = self._parse_sig_js(code) File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 1314, in _parse_sig_js jscode, 'Initial JS player signature function name', group='sig') File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 1005, 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; 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 "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 796, in extract_info ie_result = ie.extract(url) File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 530, in extract ie_result = self._real_extract(url) File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 1986, in _real_extract encrypted_sig, video_id, player_url, age_gate) File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 1352, in _decrypt_signature 'Signature extraction failed: ' + tb, cause=e) youtube_dl.utils.ExtractorError: Signature extraction failed: Traceback (most recent call last): File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 1342, in _decrypt_signature video_id, player_url, s File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 1250, in _extract_signature_function res = self._parse_sig_js(code) File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 1314, in _parse_sig_js jscode, 'Initial JS player signature function name', group='sig') File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 1005, in _search_regex raise RegexNotFoundError('Unable to extract %s' % _name) youtube_dl.utils.RegexNotFoundError: Unable to extract Initial JS player signature function name; ```

deekerman

2026-02-21 09:21:30 -05:00

closed this issue
added the
outdated-version
label

deekerman commented

2026-02-21 09:21:34 -05:00

Author

Owner

@dstftw commented on GitHub (Jun 24, 2019):

Using current git head version 2e11e51c04
2019.05.20 and also 2019.05.11.

Wrong.

@dstftw commented on GitHub (Jun 24, 2019): >Using current git head version 2e11e51c041bd95dd1305af5b958abacc27f39f7 2019.05.20 and also 2019.05.11. Wrong.

deekerman referenced this issue

2026-02-21 10:10:34 -05:00

Failing to retry download or try next format on "Did not get any data blocks" error #18543

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starred/youtube-dl-ytdl-org#17148

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