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[Youtube] RegexNotFoundError: Unable to extract Initial JS player signature function name #4603

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opened 2026-02-21 00:20:17 -05:00 by deekerman · 2 comments

deekerman commented

2026-02-21 00:20:17 -05:00

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Originally created by @hub187 on GitHub (May 3, 2015).

I am getting a "[Youtube] RegexNotFoundError: Unable to extract Initial JS player signature function name" error with latest version of youtube-dl.

This is similar another issue that was apparently resolved by updating to latest version. "[Youtube] RegexNotFoundError: Unable to extract Initial JS player signature function name #5546 "

Obviously happy to provide assistance in getting this fixed if needed. I am sorry if I missed something obvious and this is not a bug also!!

TRACE IN VERBOSE (using debian Jessie 64bits):

leonard@debian8:~/Dropbox/Music$ youtube-dl --extract-audio --audio-format mp3 --verbose "https://www.youtube.com/watch?feature=player_detailpage&v=D0TnJUsoR7s"
[debug] System config: []
[debug] User config: []
[debug] Command-line args: ['--extract-audio', '--audio-format', 'mp3', '--verbose', 'https://www.youtube.com/watch?feature=player_detailpage&v=D0TnJUsoR7s']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2014.08.05
[debug] Python version 2.7.9 - Linux-3.16.0-4-amd64-x86_64-with-debian-8.0
[debug] Proxy map: {}
[youtube] Setting language
[youtube] D0TnJUsoR7s: Downloading webpage
[youtube] D0TnJUsoR7s: Downloading video info webpage
[youtube] D0TnJUsoR7s: Extracting video information
[youtube] D0TnJUsoR7s: Encrypted signatures detected.
[youtube] {22} signature length 43.43, html5 player en_US-vflheTb7D
[youtube] D0TnJUsoR7s: Downloading js player vflheTb7D
ERROR: Signature extraction failed: Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 479, in _decrypt_signature
video_id, player_url, s
File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 383, in _extract_signature_function
res = self._parse_sig_js(code)
File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 454, in _parse_sig_js
u'Initial JS player signature function name')
File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/common.py", line 391, in _search_regex
raise RegexNotFoundError(u'Unable to extract %s' % _name)
RegexNotFoundError: Unable to extract Initial JS player signature function name; please report this issue on https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag and include its complete output. Make sure you are using the latest version; type youtube-dl -U to update.
; please report this issue on https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag and include its complete output. Make sure you are using the latest version; type youtube-dl -U to update.
Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 479, in _decrypt_signature
video_id, player_url, s
File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 383, in _extract_signature_function
res = self._parse_sig_js(code)
File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 454, in _parse_sig_js
u'Initial JS player signature function name')
File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/common.py", line 391, in _search_regex
raise RegexNotFoundError(u'Unable to extract %s' % _name)
RegexNotFoundError: Unable to extract Initial JS player signature function name; please report this issue on https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag and include its complete output. Make sure you are using the latest version; type youtube-dl -U to update.
Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/youtube_dl/YoutubeDL.py", line 516, in extract_info
ie_result = ie.extract(url)
File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/common.py", line 170, in extract
return self._real_extract(url)
File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 860, in _real_extract
encrypted_sig, video_id, player_url, age_gate)
File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 489, in _decrypt_signature
u'Signature extraction failed: ' + tb, cause=e)
ExtractorError: Signature extraction failed: Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 479, in _decrypt_signature
video_id, player_url, s
File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 383, in _extract_signature_function
res = self._parse_sig_js(code)
File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 454, in _parse_sig_js
u'Initial JS player signature function name')
File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/common.py", line 391, in _search_regex
raise RegexNotFoundError(u'Unable to extract %s' % _name)
RegexNotFoundError: Unable to extract Initial JS player signature function name; please report this issue on https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag and include its complete output. Make sure you are using the latest version; type youtube-dl -U to update.
; please report this issue on https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag and include its complete output. Make sure you are using the latest version; type youtube-dl -U to update.

Originally created by @hub187 on GitHub (May 3, 2015). I am getting a "[Youtube] RegexNotFoundError: Unable to extract Initial JS player signature function name" error with latest version of youtube-dl. This is similar another issue that was apparently resolved by updating to latest version. "[Youtube] RegexNotFoundError: Unable to extract Initial JS player signature function name #5546 " Obviously happy to provide assistance in getting this fixed if needed. I am sorry if I missed something obvious and this is not a bug also!! TRACE IN VERBOSE (using debian Jessie 64bits): leonard@debian8:~/Dropbox/Music$ youtube-dl --extract-audio --audio-format mp3 --verbose "https://www.youtube.com/watch?feature=player_detailpage&v=D0TnJUsoR7s" [debug] System config: [] [debug] User config: [] [debug] Command-line args: ['--extract-audio', '--audio-format', 'mp3', '--verbose', 'https://www.youtube.com/watch?feature=player_detailpage&v=D0TnJUsoR7s'] [debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8 [debug] youtube-dl version 2014.08.05 [debug] Python version 2.7.9 - Linux-3.16.0-4-amd64-x86_64-with-debian-8.0 [debug] Proxy map: {} [youtube] Setting language [youtube] D0TnJUsoR7s: Downloading webpage [youtube] D0TnJUsoR7s: Downloading video info webpage [youtube] D0TnJUsoR7s: Extracting video information [youtube] D0TnJUsoR7s: Encrypted signatures detected. [youtube] {22} signature length 43.43, html5 player en_US-vflheTb7D [youtube] D0TnJUsoR7s: Downloading js player vflheTb7D ERROR: Signature extraction failed: Traceback (most recent call last): File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 479, in _decrypt_signature video_id, player_url, s File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 383, in _extract_signature_function res = self._parse_sig_js(code) File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 454, in _parse_sig_js u'Initial JS player signature function name') File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/common.py", line 391, in _search_regex raise RegexNotFoundError(u'Unable to extract %s' % _name) RegexNotFoundError: Unable to extract Initial JS player signature function name; please report this issue on https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag and include its complete output. Make sure you are using the latest version; type youtube-dl -U to update. ; please report this issue on https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag and include its complete output. Make sure you are using the latest version; type youtube-dl -U to update. Traceback (most recent call last): File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 479, in _decrypt_signature video_id, player_url, s File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 383, in _extract_signature_function res = self._parse_sig_js(code) File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 454, in _parse_sig_js u'Initial JS player signature function name') File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/common.py", line 391, in _search_regex raise RegexNotFoundError(u'Unable to extract %s' % _name) RegexNotFoundError: Unable to extract Initial JS player signature function name; please report this issue on https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag and include its complete output. Make sure you are using the latest version; type youtube-dl -U to update. Traceback (most recent call last): File "/usr/lib/python2.7/dist-packages/youtube_dl/YoutubeDL.py", line 516, in extract_info ie_result = ie.extract(url) File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/common.py", line 170, in extract return self._real_extract(url) File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 860, in _real_extract encrypted_sig, video_id, player_url, age_gate) File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 489, in _decrypt_signature u'Signature extraction failed: ' + tb, cause=e) ExtractorError: Signature extraction failed: Traceback (most recent call last): File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 479, in _decrypt_signature video_id, player_url, s File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 383, in _extract_signature_function res = self._parse_sig_js(code) File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 454, in _parse_sig_js u'Initial JS player signature function name') File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/common.py", line 391, in _search_regex raise RegexNotFoundError(u'Unable to extract %s' % _name) RegexNotFoundError: Unable to extract Initial JS player signature function name; please report this issue on https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag and include its complete output. Make sure you are using the latest version; type youtube-dl -U to update. ; please report this issue on https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag and include its complete output. Make sure you are using the latest version; type youtube-dl -U to update.

deekerman closed this issue

2026-02-21 00:20:18 -05:00

deekerman commented

2026-02-21 00:20:20 -05:00

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Owner

@jaimeMF commented on GitHub (May 3, 2015):

You are using an outdated version of youtube-dl. Read our FAQ if you have trouble updating.

@jaimeMF commented on GitHub (May 3, 2015): You are using an outdated version of youtube-dl. Read [our FAQ](https://yt-dl.org/update) if you have trouble updating.

deekerman commented

2026-02-21 00:20:20 -05:00

Author

Owner

@hub187 commented on GitHub (May 3, 2015):

Many thanks. I downloaded the zip from the main page which was not the "latest" version indeed!!

Sorry for missing this out!

@hub187 commented on GitHub (May 3, 2015): Many thanks. I downloaded the zip from the main page which was not the "latest" version indeed!! Sorry for missing this out!

deekerman referenced this issue

2026-02-21 03:36:51 -05:00

Signature extraction failed: Traceback (most recent call last) #9613

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