Unsupported JS expression

[brandazzle]

I have no idea what happened, but youtube-dl told me to report it as an error.

The command:
youtube-dl https://www.youtube.com/playlist?list=PL9tY0BWXOZFv8qCcpcUOiUXHuPLsynLE7 --metadata-from-title "%(artist)s - %(track)s (*)" --add-metadata track_number=playlist_index album="Cheap Queen" --verbose

The output:

[debug] User config: [u'-f', u'm4a/wav/mp3']
[debug] Custom config: []
[debug] Command-line args: [u'https://www.youtube.com/playlist?list=PL9tY0BWXOZFv8qCcpcUOiUXHuPLsynLE7', u'--metadata-from-title', u'%(artist)s - %(track)s (*)', u'--add-metadata', u'track_number=playlist_index', u'album=Cheap Queen', u'--verbose']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2019.11.28
[debug] Python version 2.7.14 (CPython) - Darwin-18.7.0-x86_64-i386-64bit
[debug] exe versions: ffmpeg 4.0, ffprobe 4.0
[debug] Proxy map: {}
[youtube:playlist] PL9tY0BWXOZFv8qCcpcUOiUXHuPLsynLE7: Downloading webpage
[download] Downloading playlist: King Princess 'Cheap Queen' Album
[youtube:playlist] playlist King Princess 'Cheap Queen' Album: Downloading 14 videos
[download] Downloading video 1 of 14
[youtube] 0PoYuM4dYUI: Downloading webpage
[youtube] 0PoYuM4dYUI: Downloading video info webpage
[youtube] {18} signature length 105, html5 player vfl7lL1_p
[youtube] 0PoYuM4dYUI: Downloading player https://www.youtube.com/yts/jsbin/player_ias-vfl7lL1_p/en_US/base.js
ERROR: Signature extraction failed: Traceback (most recent call last):
  File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 1380, in _decrypt_signature
    video_id, player_url, s
  File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 1293, in _extract_signature_function
    cache_res = res(test_string)
  File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 1356, in <lambda>
    return lambda s: initial_function([s])
  File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 258, in resf
    res, abort = self.interpret_statement(stmt, local_vars)
  File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 56, in interpret_statement
    v = self.interpret_expression(expr, local_vars, allow_recursion)
  File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 92, in interpret_expression
    m.group('expr'), local_vars, allow_recursion - 1)
  File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 189, in interpret_expression
    m.group('x'), local_vars, allow_recursion - 1)
  File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 56, in interpret_statement
    v = self.interpret_expression(expr, local_vars, allow_recursion)
  File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 189, in interpret_expression
    m.group('x'), local_vars, allow_recursion - 1)
  File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 56, in interpret_statement
    v = self.interpret_expression(expr, local_vars, allow_recursion)
  File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 211, in interpret_expression
    raise ExtractorError('Unsupported JS expression %r' % expr)
ExtractorError: Unsupported JS expression u'[function(c,d){d=(d'; 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(u"Unsupported JS expression u'[function(c,d){d=(d'; 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/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 1380, in _decrypt_signature
    video_id, player_url, s
  File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 1293, in _extract_signature_function
    cache_res = res(test_string)
  File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 1356, in <lambda>
    return lambda s: initial_function([s])
  File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 258, in resf
    res, abort = self.interpret_statement(stmt, local_vars)
  File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 56, in interpret_statement
    v = self.interpret_expression(expr, local_vars, allow_recursion)
  File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 92, in interpret_expression
    m.group('expr'), local_vars, allow_recursion - 1)
  File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 189, in interpret_expression
    m.group('x'), local_vars, allow_recursion - 1)
  File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 56, in interpret_statement
    v = self.interpret_expression(expr, local_vars, allow_recursion)
  File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 189, in interpret_expression
    m.group('x'), local_vars, allow_recursion - 1)
  File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 56, in interpret_statement
    v = self.interpret_expression(expr, local_vars, allow_recursion)
  File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 211, in interpret_expression
    raise ExtractorError('Unsupported JS expression %r' % expr)
ExtractorError: Unsupported JS expression u'[function(c,d){d=(d'; 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/local/lib/python2.7/site-packages/youtube_dl/YoutubeDL.py", line 796, in extract_info
    ie_result = ie.extract(url)
  File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/common.py", line 530, in extract
    ie_result = self._real_extract(url)
  File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 2043, in _real_extract
    encrypted_sig, video_id, player_url, age_gate)
  File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 1390, in _decrypt_signature
    'Signature extraction failed: ' + tb, cause=e)
ExtractorError: Signature extraction failed: Traceback (most recent call last):
  File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 1380, in _decrypt_signature
    video_id, player_url, s
  File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 1293, in _extract_signature_function
    cache_res = res(test_string)
  File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 1356, in <lambda>
    return lambda s: initial_function([s])
  File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 258, in resf
    res, abort = self.interpret_statement(stmt, local_vars)
  File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 56, in interpret_statement
    v = self.interpret_expression(expr, local_vars, allow_recursion)
  File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 92, in interpret_expression
    m.group('expr'), local_vars, allow_recursion - 1)
  File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 189, in interpret_expression
    m.group('x'), local_vars, allow_recursion - 1)
  File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 56, in interpret_statement
    v = self.interpret_expression(expr, local_vars, allow_recursion)
  File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 189, in interpret_expression
    m.group('x'), local_vars, allow_recursion - 1)
  File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 56, in interpret_statement
    v = self.interpret_expression(expr, local_vars, allow_recursion)
  File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 211, in interpret_expression
    raise ExtractorError('Unsupported JS expression %r' % expr)
ExtractorError: Unsupported JS expression u'[function(c,d){d=(d'; 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(u"Unsupported JS expression u'[function(c,d){d=(d'; 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.```

[leonardb2001]

I had a similar problem just now, never had such an error before:

[youtube] 5wKfF7zXVc0: Downloading webpage [youtube] 5wKfF7zXVc0: Downloading video info webpage [youtube] 5wKfF7zXVc0: Downloading js player vfl7lL1_p ERROR: Signature extraction failed: Traceback (most recent call last): File "/home/leonard/Projects/ytdl-no/src/venv/lib/python3.7/site-packages/youtube_dl/extractor/youtube.py", line 1384, in _decrypt_signature video_id, player_url, s File "/home/leonard/Projects/ytdl-no/src/venv/lib/python3.7/site-packages/youtube_dl/extractor/youtube.py", line 1297, in _extract_signature_function cache_res = res(test_string) File "/home/leonard/Projects/ytdl-no/src/venv/lib/python3.7/site-packages/youtube_dl/extractor/youtube.py", line 1360, in <lambda> return lambda s: initial_function([s]) File "/home/leonard/Projects/ytdl-no/src/venv/lib/python3.7/site-packages/youtube_dl/jsinterp.py", line 258, in resf res, abort = self.interpret_statement(stmt, local_vars) File "/home/leonard/Projects/ytdl-no/src/venv/lib/python3.7/site-packages/youtube_dl/jsinterp.py", line 56, in interpret_statement v = self.interpret_expression(expr, local_vars, allow_recursion) File "/home/leonard/Projects/ytdl-no/src/venv/lib/python3.7/site-packages/youtube_dl/jsinterp.py", line 92, in interpret_expression m.group('expr'), local_vars, allow_recursion - 1) File "/home/leonard/Projects/ytdl-no/src/venv/lib/python3.7/site-packages/youtube_dl/jsinterp.py", line 189, in interpret_expression m.group('x'), local_vars, allow_recursion - 1) File "/home/leonard/Projects/ytdl-no/src/venv/lib/python3.7/site-packages/youtube_dl/jsinterp.py", line 56, in interpret_statement v = self.interpret_expression(expr, local_vars, allow_recursion) File "/home/leonard/Projects/ytdl-no/src/venv/lib/python3.7/site-packages/youtube_dl/jsinterp.py", line 189, in interpret_expression m.group('x'), local_vars, allow_recursion - 1) File "/home/leonard/Projects/ytdl-no/src/venv/lib/python3.7/site-packages/youtube_dl/jsinterp.py", line 56, in interpret_statement v = self.interpret_expression(expr, local_vars, allow_recursion) File "/home/leonard/Projects/ytdl-no/src/venv/lib/python3.7/site-packages/youtube_dl/jsinterp.py", line 211, in interpret_expression raise ExtractorError('Unsupported JS expression %r' % expr) youtube_dl.utils.ExtractorError: Unsupported JS expression '[function(c,d){d=(d'; 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("Unsupported JS expression '[function(c,d){d=(d'; 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. ERROR: Signature extraction failed: Traceback (most recent call last): File "/home/leonard/Projects/ytdl-no/src/venv/lib/python3.7/site-packages/youtube_dl/extractor/youtube.py", line 1384, in _decrypt_signature video_id, player_url, s File "/home/leonard/Projects/ytdl-no/src/venv/lib/python3.7/site-packages/youtube_dl/extractor/youtube.py", line 1297, in _extract_signature_function cache_res = res(test_string) File "/home/leonard/Projects/ytdl-no/src/venv/lib/python3.7/site-packages/youtube_dl/extractor/youtube.py", line 1360, in <lambda> return lambda s: initial_function([s]) File "/home/leonard/Projects/ytdl-no/src/venv/lib/python3.7/site-packages/youtube_dl/jsinterp.py", line 258, in resf res, abort = self.interpret_statement(stmt, local_vars) File "/home/leonard/Projects/ytdl-no/src/venv/lib/python3.7/site-packages/youtube_dl/jsinterp.py", line 56, in interpret_statement v = self.interpret_expression(expr, local_vars, allow_recursion) File "/home/leonard/Projects/ytdl-no/src/venv/lib/python3.7/site-packages/youtube_dl/jsinterp.py", line 92, in interpret_expression m.group('expr'), local_vars, allow_recursion - 1) File "/home/leonard/Projects/ytdl-no/src/venv/lib/python3.7/site-packages/youtube_dl/jsinterp.py", line 189, in interpret_expression m.group('x'), local_vars, allow_recursion - 1) File "/home/leonard/Projects/ytdl-no/src/venv/lib/python3.7/site-packages/youtube_dl/jsinterp.py", line 56, in interpret_statement v = self.interpret_expression(expr, local_vars, allow_recursion) File "/home/leonard/Projects/ytdl-no/src/venv/lib/python3.7/site-packages/youtube_dl/jsinterp.py", line 189, in interpret_expression m.group('x'), local_vars, allow_recursion - 1) File "/home/leonard/Projects/ytdl-no/src/venv/lib/python3.7/site-packages/youtube_dl/jsinterp.py", line 56, in interpret_statement v = self.interpret_expression(expr, local_vars, allow_recursion) File "/home/leonard/Projects/ytdl-no/src/venv/lib/python3.7/site-packages/youtube_dl/jsinterp.py", line 211, in interpret_expression raise ExtractorError('Unsupported JS expression %r' % expr) youtube_dl.utils.ExtractorError: Unsupported JS expression '[function(c,d){d=(d'; 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("Unsupported JS expression '[function(c,d){d=(d'; 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.