youtube-dl: youtube_dl.utils.ExtractorError: Could not find JS function 'na'

I am running the latest version of “youtube-dl” A particular video gave me an error. Just below is the output from trying it with --verbose flag.

~/ytdl-verbose.sh https://www.youtube.com/watch?v=dsFpUW48Tnc
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['--verbose', '-o', '~/Music/from-youtube/%(title)s.%(ext)s', '-f', 'best', 'https://www.youtube.com/watch?v=dsFpUW48Tnc']
[debug] Encodings: locale UTF-8, fs utf-8, out utf-8, pref UTF-8
[debug] youtube-dl version 2021.04.26
[debug] Python version 3.8.10 (CPython) - Linux-5.4.0-91-generic-x86_64-with-glibc2.29
[debug] exe versions: none
[debug] Proxy map: {}
[youtube] dsFpUW48Tnc: Downloading webpage
[youtube] dsFpUW48Tnc: Downloading player f3c4e04d
ERROR: Signature extraction failed: Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/youtube.py", line 1348, in _decrypt_signature
    func = self._extract_signature_function(
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/youtube.py", line 1262, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/youtube.py", line 1331, in _parse_sig_js
    initial_function = jsi.extract_function(funcname)
  File "/usr/lib/python3/dist-packages/youtube_dl/jsinterp.py", line 245, in extract_function
    raise ExtractorError('Could not find JS function %r' % funcname)
youtube_dl.utils.ExtractorError: Could not find JS function 'na'; 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 ExtractorError("Could not find JS function 'na'; 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 1348, in _decrypt_signature
    func = self._extract_signature_function(
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/youtube.py", line 1262, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/youtube.py", line 1331, in _parse_sig_js
    initial_function = jsi.extract_function(funcname)
  File "/usr/lib/python3/dist-packages/youtube_dl/jsinterp.py", line 245, in extract_function
    raise ExtractorError('Could not find JS function %r' % funcname)
youtube_dl.utils.ExtractorError: Could not find JS function 'na'; 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 1348, in _decrypt_signature
    func = self._extract_signature_function(
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/youtube.py", line 1262, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/youtube.py", line 1331, in _parse_sig_js
    initial_function = jsi.extract_function(funcname)
  File "/usr/lib/python3/dist-packages/youtube_dl/jsinterp.py", line 245, in extract_function
    raise ExtractorError('Could not find JS function %r' % funcname)
youtube_dl.utils.ExtractorError: Could not find JS function 'na'; 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 806, in wrapper
    return func(self, *args, **kwargs)
  File "/usr/lib/python3/dist-packages/youtube_dl/YoutubeDL.py", line 827, in __extract_info
    ie_result = ie.extract(url)
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/common.py", line 534, in extract
    ie_result = self._real_extract(url)
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/youtube.py", line 1622, in _real_extract
    signature = self._decrypt_signature(sc['s'][0], video_id, player_url)
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/youtube.py", line 1358, in _decrypt_signature
    raise ExtractorError(
youtube_dl.utils.ExtractorError: Signature extraction failed: Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/youtube.py", line 1348, in _decrypt_signature
    func = self._extract_signature_function(
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/youtube.py", line 1262, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/youtube.py", line 1331, in _parse_sig_js
    initial_function = jsi.extract_function(funcname)
  File "/usr/lib/python3/dist-packages/youtube_dl/jsinterp.py", line 245, in extract_function
    raise ExtractorError('Could not find JS function %r' % funcname)
youtube_dl.utils.ExtractorError: Could not find JS function 'na'; 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 ExtractorError("Could not find JS function 'na'; 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.

About this issue

Original URL
State: closed
Created 3 years ago
Reactions: 7
Comments: 25 (1 by maintainers)

Most upvoted comments

Anyway, thanks to maintainers who have released the fix in less than 24 hours. 👏👏👏

aliostad on Dec 16, 2021

Sure enough. I have not worked on OSS for years. The “youtube-dl” program’s instructions upon encountering the error said to report the bug here, there is no indication of a template etc.

deatrys

deatrys on Dec 16, 2021

But I will tell you @s3n0 this:

As someone who has been working on OSS for years whose contributions are used in production by thousands (just check my repos), I find your attitude disgusting. Have some respect. You could have simply said the problem is fixed and PR raised, waiting for merge and release, instead of trolling.

aliostad on Dec 16, 2021

Duplicate of #30363, with fix.

supersu-man on Dec 16, 2021

Duplicates. Before making a new issue report, take a little look at other recent titles. Besides 2021.04.26 is not the latest.

ghost on Dec 16, 2021

i just got the same error, also using most updated version. I successfully downloaded videos just a few days ago

Jarib13 on Dec 16, 2021