Encrypted Signature / HTTP Error 403: Forbidden

[RingoTheDog]

Thanks as always...
Ringo.

Example URL: http://www.youtube.com/watch?v=x3Ky8zTh6DY

Output:
C:\Transmogrifier>youtube-dl.py -v http://www.youtube.com/watch?v=x3Ky8zTh6DY
[debug] System config: []
[debug] User config: []
[debug] Command-line args: ['-v', 'http://www.youtube.com/watch?v=x3Ky8zTh6DY'
[debug] Encodings: locale 'cp1252', fs 'mbcs', out 'cp850', pref: 'cp1252'
[debug] youtube-dl version 2014.02.04
[debug] Python version 2.7.6 - Windows-7-6.1.7601-SP1
[debug] Proxy map: {}
[youtube] Setting language
[youtube] x3Ky8zTh6DY: Downloading webpage
[youtube] x3Ky8zTh6DY: Downloading video info webpage
[youtube] x3Ky8zTh6DY: Extracting video information
[youtube] x3Ky8zTh6DY: Encrypted signatures detected.
[youtube] encrypted signature length 90 (46.43), itag 22, html5 player vfle-mV

[youtube] x3Ky8zTh6DY: Downloading js player mVwz
WARNING: Writing cache to u'C:\Users\cbasbaum_adm/.cache\youtube-dl\youtub
sigfuncs\js_mVwz_90.json' failed: Traceback (most recent call last):
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
69, in _extract_signature_function
cache_res = res(test_string)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
30, in
return lambda s: initial_function([s])
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
25, in resf
res = interpret_statement(stmt, local_vars)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
60, in interpret_statement
v = interpret_expression(expr, local_vars, allow_recursion)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
13, in interpret_expression
raise ExtractorError(u'Unsupported JS expression %r' % expr)
ExtractorError: Unsupported JS expression u'$y(a,7)'; please report this issue
n https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag a
include its complete output. Make sure you are using the latest version; type
youtube-dl -U to update.

WARNING: Automatic signature extraction failed: Traceback (most recent call la
):
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
62, in _decrypt_signature
return func(s)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
30, in
return lambda s: initial_function([s])
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
25, in resf
res = interpret_statement(stmt, local_vars)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
60, in interpret_statement
v = interpret_expression(expr, local_vars, allow_recursion)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
13, in interpret_expression
raise ExtractorError(u'Unsupported JS expression %r' % expr)
ExtractorError: Unsupported JS expression u'$y(a,7)'; please report this issue
n https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag a
include its complete output. Make sure you are using the latest version; type
youtube-dl -U to update.

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 90 (46.43), itag 84, html5 player vfle-mV

WARNING: Automatic signature extraction failed: Traceback (most recent call la
):
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
62, in _decrypt_signature
return func(s)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
30, in
return lambda s: initial_function([s])
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
25, in resf
res = interpret_statement(stmt, local_vars)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
60, in interpret_statement
v = interpret_expression(expr, local_vars, allow_recursion)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
13, in interpret_expression
raise ExtractorError(u'Unsupported JS expression %r' % expr)
ExtractorError: Unsupported JS expression u'$y(a,7)'; please report this issue
n https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag a
include its complete output. Make sure you are using the latest version; type
youtube-dl -U to update.

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 90 (46.43), itag 43, html5 player vfle-mV

WARNING: Automatic signature extraction failed: Traceback (most recent call la
):
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
62, in _decrypt_signature
return func(s)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
30, in
return lambda s: initial_function([s])
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
25, in resf
res = interpret_statement(stmt, local_vars)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
60, in interpret_statement
v = interpret_expression(expr, local_vars, allow_recursion)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
13, in interpret_expression
raise ExtractorError(u'Unsupported JS expression %r' % expr)
ExtractorError: Unsupported JS expression u'$y(a,7)'; please report this issue
n https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag a
include its complete output. Make sure you are using the latest version; type
youtube-dl -U to update.

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 90 (46.43), itag 100, html5 player vfle-m
z
WARNING: Automatic signature extraction failed: Traceback (most recent call la
):
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
62, in _decrypt_signature
return func(s)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
30, in
return lambda s: initial_function([s])
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
25, in resf
res = interpret_statement(stmt, local_vars)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
60, in interpret_statement
v = interpret_expression(expr, local_vars, allow_recursion)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
13, in interpret_expression
raise ExtractorError(u'Unsupported JS expression %r' % expr)
ExtractorError: Unsupported JS expression u'$y(a,7)'; please report this issue
n https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag a
include its complete output. Make sure you are using the latest version; type
youtube-dl -U to update.

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 90 (46.43), itag 18, html5 player vfle-mV

WARNING: Automatic signature extraction failed: Traceback (most recent call la
):
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
62, in _decrypt_signature
return func(s)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
30, in
return lambda s: initial_function([s])
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
25, in resf
res = interpret_statement(stmt, local_vars)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
60, in interpret_statement
v = interpret_expression(expr, local_vars, allow_recursion)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
13, in interpret_expression
raise ExtractorError(u'Unsupported JS expression %r' % expr)
ExtractorError: Unsupported JS expression u'$y(a,7)'; please report this issue
n https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag a
include its complete output. Make sure you are using the latest version; type
youtube-dl -U to update.

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 90 (46.43), itag 82, html5 player vfle-mV

WARNING: Automatic signature extraction failed: Traceback (most recent call la
):
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
62, in _decrypt_signature
return func(s)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
30, in
return lambda s: initial_function([s])
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
25, in resf
res = interpret_statement(stmt, local_vars)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
60, in interpret_statement
v = interpret_expression(expr, local_vars, allow_recursion)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
13, in interpret_expression
raise ExtractorError(u'Unsupported JS expression %r' % expr)
ExtractorError: Unsupported JS expression u'$y(a,7)'; please report this issue
n https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag a
include its complete output. Make sure you are using the latest version; type
youtube-dl -U to update.

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 90 (46.43), itag 5, html5 player vfle-mVw
WARNING: Automatic signature extraction failed: Traceback (most recent call la
):
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
62, in _decrypt_signature
return func(s)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
30, in
return lambda s: initial_function([s])
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
25, in resf
res = interpret_statement(stmt, local_vars)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
60, in interpret_statement
v = interpret_expression(expr, local_vars, allow_recursion)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
13, in interpret_expression
raise ExtractorError(u'Unsupported JS expression %r' % expr)
ExtractorError: Unsupported JS expression u'$y(a,7)'; please report this issue
n https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag a
include its complete output. Make sure you are using the latest version; type
youtube-dl -U to update.

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 90 (46.43), itag 36, html5 player vfle-mV

WARNING: Automatic signature extraction failed: Traceback (most recent call la
):
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
62, in _decrypt_signature
return func(s)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
30, in
return lambda s: initial_function([s])
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
25, in resf
res = interpret_statement(stmt, local_vars)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
60, in interpret_statement
v = interpret_expression(expr, local_vars, allow_recursion)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
13, in interpret_expression
raise ExtractorError(u'Unsupported JS expression %r' % expr)
ExtractorError: Unsupported JS expression u'$y(a,7)'; please report this issue
n https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag a
include its complete output. Make sure you are using the latest version; type
youtube-dl -U to update.

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 90 (46.43), itag 17, html5 player vfle-mV

WARNING: Automatic signature extraction failed: Traceback (most recent call la
):
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
62, in _decrypt_signature
return func(s)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
30, in
return lambda s: initial_function([s])
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
25, in resf
res = interpret_statement(stmt, local_vars)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
60, in interpret_statement
v = interpret_expression(expr, local_vars, allow_recursion)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
13, in interpret_expression
raise ExtractorError(u'Unsupported JS expression %r' % expr)
ExtractorError: Unsupported JS expression u'$y(a,7)'; please report this issue
n https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag a
include its complete output. Make sure you are using the latest version; type
youtube-dl -U to update.

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 89 (45.43), itag 137, html5 player vfle-m
z
[youtube] x3Ky8zTh6DY: Downloading js player mVwz
WARNING: Writing cache to u'C:\Users\cbasbaum_adm/.cache\youtube-dl\youtub
sigfuncs\js_mVwz_89.json' failed: Traceback (most recent call last):
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
69, in _extract_signature_function
cache_res = res(test_string)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
30, in
return lambda s: initial_function([s])
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
25, in resf
res = interpret_statement(stmt, local_vars)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
60, in interpret_statement
v = interpret_expression(expr, local_vars, allow_recursion)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
13, in interpret_expression
raise ExtractorError(u'Unsupported JS expression %r' % expr)
ExtractorError: Unsupported JS expression u'$y(a,7)'; please report this issue
n https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag a
include its complete output. Make sure you are using the latest version; type
youtube-dl -U to update.

WARNING: Automatic signature extraction failed: Traceback (most recent call la
):
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
62, in _decrypt_signature
return func(s)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
30, in
return lambda s: initial_function([s])
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
25, in resf
res = interpret_statement(stmt, local_vars)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
60, in interpret_statement
v = interpret_expression(expr, local_vars, allow_recursion)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
13, in interpret_expression
raise ExtractorError(u'Unsupported JS expression %r' % expr)
ExtractorError: Unsupported JS expression u'$y(a,7)'; please report this issue
n https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag a
include its complete output. Make sure you are using the latest version; type
youtube-dl -U to update.

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 89 (45.43), itag 136, html5 player vfle-m
z
WARNING: Automatic signature extraction failed: Traceback (most recent call la
):
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
62, in _decrypt_signature
return func(s)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
30, in
return lambda s: initial_function([s])
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
25, in resf
res = interpret_statement(stmt, local_vars)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
60, in interpret_statement
v = interpret_expression(expr, local_vars, allow_recursion)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
13, in interpret_expression
raise ExtractorError(u'Unsupported JS expression %r' % expr)
ExtractorError: Unsupported JS expression u'$y(a,7)'; please report this issue
n https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag a
include its complete output. Make sure you are using the latest version; type
youtube-dl -U to update.

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 89 (45.43), itag 135, html5 player vfle-m
z
WARNING: Automatic signature extraction failed: Traceback (most recent call la
):
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
62, in _decrypt_signature
return func(s)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
30, in
return lambda s: initial_function([s])
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
25, in resf
res = interpret_statement(stmt, local_vars)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
60, in interpret_statement
v = interpret_expression(expr, local_vars, allow_recursion)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
13, in interpret_expression
raise ExtractorError(u'Unsupported JS expression %r' % expr)
ExtractorError: Unsupported JS expression u'$y(a,7)'; please report this issue
n https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag a
include its complete output. Make sure you are using the latest version; type
youtube-dl -U to update.

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 89 (45.43), itag 134, html5 player vfle-m
z
WARNING: Automatic signature extraction failed: Traceback (most recent call la
):
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
62, in _decrypt_signature
return func(s)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
30, in
return lambda s: initial_function([s])
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
25, in resf
res = interpret_statement(stmt, local_vars)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
60, in interpret_statement
v = interpret_expression(expr, local_vars, allow_recursion)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
13, in interpret_expression
raise ExtractorError(u'Unsupported JS expression %r' % expr)
ExtractorError: Unsupported JS expression u'$y(a,7)'; please report this issue
n https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag a
include its complete output. Make sure you are using the latest version; type
youtube-dl -U to update.

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 89 (45.43), itag 133, html5 player vfle-m
z
WARNING: Automatic signature extraction failed: Traceback (most recent call la
):
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
62, in _decrypt_signature
return func(s)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
30, in
return lambda s: initial_function([s])
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
25, in resf
res = interpret_statement(stmt, local_vars)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
60, in interpret_statement
v = interpret_expression(expr, local_vars, allow_recursion)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
13, in interpret_expression
raise ExtractorError(u'Unsupported JS expression %r' % expr)
ExtractorError: Unsupported JS expression u'$y(a,7)'; please report this issue
n https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag a
include its complete output. Make sure you are using the latest version; type
youtube-dl -U to update.

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 89 (45.43), itag 160, html5 player vfle-m
z
WARNING: Automatic signature extraction failed: Traceback (most recent call la
):
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
62, in _decrypt_signature
return func(s)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
30, in
return lambda s: initial_function([s])
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
25, in resf
res = interpret_statement(stmt, local_vars)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
60, in interpret_statement
v = interpret_expression(expr, local_vars, allow_recursion)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
13, in interpret_expression
raise ExtractorError(u'Unsupported JS expression %r' % expr)
ExtractorError: Unsupported JS expression u'$y(a,7)'; please report this issue
n https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag a
include its complete output. Make sure you are using the latest version; type
youtube-dl -U to update.

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 89 (45.43), itag 140, html5 player vfle-m
z
WARNING: Automatic signature extraction failed: Traceback (most recent call la
):
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
62, in _decrypt_signature
return func(s)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
30, in
return lambda s: initial_function([s])
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
25, in resf
res = interpret_statement(stmt, local_vars)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
60, in interpret_statement
v = interpret_expression(expr, local_vars, allow_recursion)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
13, in interpret_expression
raise ExtractorError(u'Unsupported JS expression %r' % expr)
ExtractorError: Unsupported JS expression u'$y(a,7)'; please report this issue
n https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag a
include its complete output. Make sure you are using the latest version; type
youtube-dl -U to update.

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 89 (45.43), itag 171, html5 player vfle-m
z
WARNING: Automatic signature extraction failed: Traceback (most recent call la
):
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
62, in _decrypt_signature
return func(s)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
30, in
return lambda s: initial_function([s])
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
25, in resf
res = interpret_statement(stmt, local_vars)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
60, in interpret_statement
v = interpret_expression(expr, local_vars, allow_recursion)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
13, in interpret_expression
raise ExtractorError(u'Unsupported JS expression %r' % expr)
ExtractorError: Unsupported JS expression u'$y(a,7)'; please report this issue
n https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag a
include its complete output. Make sure you are using the latest version; type
youtube-dl -U to update.

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 90 (46.43), itag 137, html5 player vfle-m
z
WARNING: Automatic signature extraction failed: Traceback (most recent call la
):
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
62, in _decrypt_signature
return func(s)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
30, in
return lambda s: initial_function([s])
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
25, in resf
res = interpret_statement(stmt, local_vars)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
60, in interpret_statement
v = interpret_expression(expr, local_vars, allow_recursion)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
13, in interpret_expression
raise ExtractorError(u'Unsupported JS expression %r' % expr)
ExtractorError: Unsupported JS expression u'$y(a,7)'; please report this issue
n https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag a
include its complete output. Make sure you are using the latest version; type
youtube-dl -U to update.

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 90 (46.43), itag 136, html5 player vfle-m
z
WARNING: Automatic signature extraction failed: Traceback (most recent call la
):
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
62, in _decrypt_signature
return func(s)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
30, in
return lambda s: initial_function([s])
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
25, in resf
res = interpret_statement(stmt, local_vars)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
60, in interpret_statement
v = interpret_expression(expr, local_vars, allow_recursion)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
13, in interpret_expression
raise ExtractorError(u'Unsupported JS expression %r' % expr)
ExtractorError: Unsupported JS expression u'$y(a,7)'; please report this issue
n https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag a
include its complete output. Make sure you are using the latest version; type
youtube-dl -U to update.

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 90 (46.43), itag 135, html5 player vfle-m
z
WARNING: Automatic signature extraction failed: Traceback (most recent call la
):
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
62, in _decrypt_signature
return func(s)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
30, in
return lambda s: initial_function([s])
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
25, in resf
res = interpret_statement(stmt, local_vars)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
60, in interpret_statement
v = interpret_expression(expr, local_vars, allow_recursion)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
13, in interpret_expression
raise ExtractorError(u'Unsupported JS expression %r' % expr)
ExtractorError: Unsupported JS expression u'$y(a,7)'; please report this issue
n https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag a
include its complete output. Make sure you are using the latest version; type
youtube-dl -U to update.

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 90 (46.43), itag 134, html5 player vfle-m
z
WARNING: Automatic signature extraction failed: Traceback (most recent call la
):
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
62, in _decrypt_signature
return func(s)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
30, in
return lambda s: initial_function([s])
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
25, in resf
res = interpret_statement(stmt, local_vars)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
60, in interpret_statement
v = interpret_expression(expr, local_vars, allow_recursion)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
13, in interpret_expression
raise ExtractorError(u'Unsupported JS expression %r' % expr)
ExtractorError: Unsupported JS expression u'$y(a,7)'; please report this issue
n https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag a
include its complete output. Make sure you are using the latest version; type
youtube-dl -U to update.

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 90 (46.43), itag 133, html5 player vfle-m
z
WARNING: Automatic signature extraction failed: Traceback (most recent call la
):
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
62, in _decrypt_signature
return func(s)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
30, in
return lambda s: initial_function([s])
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
25, in resf
res = interpret_statement(stmt, local_vars)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
60, in interpret_statement
v = interpret_expression(expr, local_vars, allow_recursion)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
13, in interpret_expression
raise ExtractorError(u'Unsupported JS expression %r' % expr)
ExtractorError: Unsupported JS expression u'$y(a,7)'; please report this issue
n https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag a
include its complete output. Make sure you are using the latest version; type
youtube-dl -U to update.

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 90 (46.43), itag 160, html5 player vfle-m
z
WARNING: Automatic signature extraction failed: Traceback (most recent call la
):
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
62, in _decrypt_signature
return func(s)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
30, in
return lambda s: initial_function([s])
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
25, in resf
res = interpret_statement(stmt, local_vars)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
60, in interpret_statement
v = interpret_expression(expr, local_vars, allow_recursion)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
13, in interpret_expression
raise ExtractorError(u'Unsupported JS expression %r' % expr)
ExtractorError: Unsupported JS expression u'$y(a,7)'; please report this issue
n https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag a
include its complete output. Make sure you are using the latest version; type
youtube-dl -U to update.

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 90 (46.43), itag 140, html5 player vfle-m
z
WARNING: Automatic signature extraction failed: Traceback (most recent call la
):
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
62, in _decrypt_signature
return func(s)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
30, in
return lambda s: initial_function([s])
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
25, in resf
res = interpret_statement(stmt, local_vars)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
60, in interpret_statement
v = interpret_expression(expr, local_vars, allow_recursion)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
13, in interpret_expression
raise ExtractorError(u'Unsupported JS expression %r' % expr)
ExtractorError: Unsupported JS expression u'$y(a,7)'; please report this issue
n https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag a
include its complete output. Make sure you are using the latest version; type
youtube-dl -U to update.

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 90 (46.43), itag 171, html5 player vfle-m
z
WARNING: Automatic signature extraction failed: Traceback (most recent call la
):
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
62, in _decrypt_signature
return func(s)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
30, in
return lambda s: initial_function([s])
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
25, in resf
res = interpret_statement(stmt, local_vars)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
60, in interpret_statement
v = interpret_expression(expr, local_vars, allow_recursion)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\extractor\youtube.py", line
13, in interpret_expression
raise ExtractorError(u'Unsupported JS expression %r' % expr)
ExtractorError: Unsupported JS expression u'$y(a,7)'; please report this issue
n https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag a
include its complete output. Make sure you are using the latest version; type
youtube-dl -U to update.

WARNING: Warning: Falling back to static signature algorithm
ERROR: unable to download video data: HTTP Error 403: Forbidden
Traceback (most recent call last):
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\YoutubeDL.py", line 953, in
rocess_info
success = dl(filename, info_dict)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\YoutubeDL.py", line 929, in
l
return fd.download(name, info)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\downloader\common.py", line
90, in download
return self.real_download(filename, info_dict)
File "C:\Transmogrifier\youtube-dl.py\youtube_dl\downloader\http.py", line 5
in real_download
data = compat_urllib_request.urlopen(request)
File "C:\Python27\lib\urllib2.py", line 127, in urlopen
return _opener.open(url, data, timeout)
File "C:\Python27\lib\urllib2.py", line 410, in open
response = meth(req, response)
File "C:\Python27\lib\urllib2.py", line 523, in http_response
'http', request, response, code, msg, hdrs)
File "C:\Python27\lib\urllib2.py", line 448, in error
return self._call_chain(_args)
File "C:\Python27\lib\urllib2.py", line 382, in _call_chain
result = func(_args)
File "C:\Python27\lib\urllib2.py", line 531, in http_error_default
raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)
HTTPError: HTTP Error 403: Forbidden

[NelsonMinar]

I've gotten this error too, for https://www.youtube.com/watch?v=qi_31b0DHHg
Presumably the root cause is Unsupported JS expression u'$y(a,7)';

Edit: confirmed fixed after report, in youtube-dl 2014.02.04.1

[np1]

Yes, there is a $ symbol in the javascript function name now. I have fixed this in my project by handling the symbol in the regular expressions: https://github.com/np1/pafy/commit/9cf0ae7dc2bb88149c4bb1f8dbc3e33cd999af25

Might need to allow for the $ in variable names if that starts appearing too.

[jaimeMF]

Closing as a duplicate of #2304, thanks for the report.

[phihag]

Fixed in youtube-dl 2014.02.04.1. Type youtube-dl -U to update.