[youtube-dl version 2014.07.23.2] Automatic signature extraction failed...

[Elite]

youtube-dl -v -F https://www.youtube.com/watch?v=ywXNn3hoPX4
[debug] System config: []
[debug] User config: []
[debug] Command-line args: ['-v', '-F', 'https://www.youtube.com/watch?v=ywXNn3hoPX4']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2014.07.23.2
[debug] Python version 2.7.3 - Linux-3.2.0-4-amd64-x86_64-with-debian-7.1
[debug] Proxy map: {}
[youtube] Setting language
[youtube] ywXNn3hoPX4: Downloading webpage
[youtube] ywXNn3hoPX4: Downloading video info webpage
[youtube] ywXNn3hoPX4: Extracting video information
[youtube] ywXNn3hoPX4: Encrypted signatures detected.
[youtube] encrypted signature length 83 (55.27), itag 43, html5 player en_US-vflkX5nuy\/html5player
[youtube] ywXNn3hoPX4: Downloading js player vflkX5nuy
WARNING: Writing cache to u'/root/.cache/youtube-dl/youtube-sigfuncs/js_vflkX5nuy_83.json' failed: Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 392, in _extract_signature_function
    cache_res = res(test_string)
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 450, in <lambda>
    return lambda s: initial_function([s])
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/jsinterp.py", line 148, in resf
    res = self.interpret_statement(stmt, local_vars)
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/jsinterp.py", line 44, in interpret_statement
    'Cannot determine left side of statement in %r' % stmt)
ExtractorError: Cannot determine left side of statement in u'jo.Dv(a,28)'; 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.

ERROR: Automatic signature extraction failed: Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 477, in _decrypt_signature
    return func(s)
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 450, in <lambda>
    return lambda s: initial_function([s])
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/jsinterp.py", line 148, in resf
    res = self.interpret_statement(stmt, local_vars)
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/jsinterp.py", line 44, in interpret_statement
    'Cannot determine left side of statement in %r' % stmt)
ExtractorError: Cannot determine left side of statement in u'jo.Dv(a,28)'; 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/local/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 477, in _decrypt_signature
    return func(s)
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 450, in <lambda>
    return lambda s: initial_function([s])
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/jsinterp.py", line 148, in resf
    res = self.interpret_statement(stmt, local_vars)
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/jsinterp.py", line 44, in interpret_statement
    'Cannot determine left side of statement in %r' % stmt)
ExtractorError: Cannot determine left side of statement in u'jo.Dv(a,28)'; 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/local/lib/python2.7/dist-packages/youtube_dl/YoutubeDL.py", line 516, in extract_info
    ie_result = ie.extract(url)
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/extractor/common.py", line 169, in extract
    return self._real_extract(url)
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 847, in _real_extract
    encrypted_sig, video_id, player_url, age_gate)
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 481, in _decrypt_signature
    u'Automatic signature extraction failed: ' + tb, cause=e)
ExtractorError: Automatic signature extraction failed: Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 477, in _decrypt_signature
    return func(s)
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 450, in <lambda>
    return lambda s: initial_function([s])
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/jsinterp.py", line 148, in resf
    res = self.interpret_statement(stmt, local_vars)
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/jsinterp.py", line 44, in interpret_statement
    'Cannot determine left side of statement in %r' % stmt)
ExtractorError: Cannot determine left side of statement in u'jo.Dv(a,28)'; 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.

[DabKick]

Same here. Here's the output:

domU-12-31-39-09-14-01:/usr/local/bin # ./youtube-dl -v McEoTIqoRKk
[debug] System config: []
[debug] User config: []
[debug] Command-line args: ['-v', 'McEoTIqoRKk']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2014.07.23.2
[debug] Python version 2.6.8 - Linux-2.6.32.19-0.3-ec2-i686-with-SuSE-11-i586
[debug] Proxy map: {}
[youtube] Setting language
[youtube] McEoTIqoRKk: Downloading webpage
[youtube] McEoTIqoRKk: Downloading video info webpage
[youtube] McEoTIqoRKk: Extracting video information
[youtube] McEoTIqoRKk: Encrypted signatures detected.
[youtube] encrypted signature length 83 (55.27), itag 22, html5 player en_US-vfl9FYC6l
[youtube] McEoTIqoRKk: Downloading js player vfl9FYC6l
WARNING: Writing cache to u'/root/.cache/youtube-dl/youtube-sigfuncs/js_vfl9FYC6l_83.json' failed: Traceback (most recent call last):
File "./youtube-dl/youtube_dl/extractor/youtube.py", line 392, in _extract_signature_function
cache_res = res(test_string)
File "./youtube-dl/youtube_dl/extractor/youtube.py", line 450, in
return lambda s: initial_function([s])
File "./youtube-dl/youtube_dl/jsinterp.py", line 148, in resf
res = self.interpret_statement(stmt, local_vars)
File "./youtube-dl/youtube_dl/jsinterp.py", line 44, in interpret_statement
'Cannot determine left side of statement in %r' % stmt)
ExtractorError: Cannot determine left side of statement in u'jo.Dv(a,28)'; 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.

ERROR: Automatic signature extraction failed: Traceback (most recent call last):
File "./youtube-dl/youtube_dl/extractor/youtube.py", line 477, in _decrypt_signature
return func(s)
File "./youtube-dl/youtube_dl/extractor/youtube.py", line 450, in
return lambda s: initial_function([s])
File "./youtube-dl/youtube_dl/jsinterp.py", line 148, in resf
res = self.interpret_statement(stmt, local_vars)
File "./youtube-dl/youtube_dl/jsinterp.py", line 44, in interpret_statement
'Cannot determine left side of statement in %r' % stmt)
ExtractorError: Cannot determine left side of statement in u'jo.Dv(a,28)'; 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 "./youtube-dl/youtube_dl/extractor/youtube.py", line 477, in _decrypt_signature
return func(s)
File "./youtube-dl/youtube_dl/extractor/youtube.py", line 450, in
return lambda s: initial_function([s])
File "./youtube-dl/youtube_dl/jsinterp.py", line 148, in resf
res = self.interpret_statement(stmt, local_vars)
File "./youtube-dl/youtube_dl/jsinterp.py", line 44, in interpret_statement
'Cannot determine left side of statement in %r' % stmt)
ExtractorError: Cannot determine left side of statement in u'jo.Dv(a,28)'; 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 "./youtube-dl/youtube_dl/YoutubeDL.py", line 516, in extract_info
ie_result = ie.extract(url)
File "./youtube-dl/youtube_dl/extractor/common.py", line 169, in extract
return self._real_extract(url)
File "./youtube-dl/youtube_dl/extractor/youtube.py", line 847, in _real_extract
encrypted_sig, video_id, player_url, age_gate)
File "./youtube-dl/youtube_dl/extractor/youtube.py", line 481, in _decrypt_signature
u'Automatic signature extraction failed: ' + tb, cause=e)
ExtractorError: Automatic signature extraction failed: Traceback (most recent call last):
File "./youtube-dl/youtube_dl/extractor/youtube.py", line 477, in _decrypt_signature
return func(s)
File "./youtube-dl/youtube_dl/extractor/youtube.py", line 450, in
return lambda s: initial_function([s])
File "./youtube-dl/youtube_dl/jsinterp.py", line 148, in resf
res = self.interpret_statement(stmt, local_vars)
File "./youtube-dl/youtube_dl/jsinterp.py", line 44, in interpret_statement
'Cannot determine left side of statement in %r' % stmt)
ExtractorError: Cannot determine left side of statement in u'jo.Dv(a,28)'; 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.

[jaimeMF]

Duplicate of #3334.

[phihag]

Support for the new YouTube player type has been added in youtube-dl 2014.07.24. Type ./youtube-dl -U to update.