Version 2014.06.19 gives "HTTPError: HTTP Error 403: Forbidden" on many videos

[carlosmarin]

$ youtube-dl --version
2014.06.19

$ youtube-dl https://www.youtube.com/watch?v=KlyDYI_ddZY -v
[debug] System config: []
[debug] User config: []
[debug] Command-line args: ['https://www.youtube.com/watch?v=KlyDYI_ddZY', '-v']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2014.06.19
[debug] Git HEAD: 68be483
[debug] Python version 2.7.7 - Darwin-13.2.0-x86_64-i386-64bit
[debug] Proxy map: {}
[youtube] Setting language
[youtube] KlyDYI_ddZY: Downloading webpage
[youtube] KlyDYI_ddZY: Downloading video info webpage
[youtube] KlyDYI_ddZY: Extracting video information
[youtube] KlyDYI_ddZY: Encrypted signatures detected.
[youtube] encrypted signature length 88 (44.43), itag 22, html5 player en_US-vflqZIm5b
[youtube] KlyDYI_ddZY: Downloading js player vflqZIm5b
WARNING: Writing cache to u'/Users/carlos.marin/.cache/youtube-dl/youtube-sigfuncs/js_vflqZIm5b_88.json' failed: Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 390, in _extract_signature_function
cache_res = res(test_string)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 448, in
return lambda s: initial_function([s])
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 113, in resf
res = self.interpret_statement(stmt, local_vars)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 45, 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 58, in interpret_expression
val = local_vars[m.group('in')]
KeyError: u'lo'

WARNING: Automatic signature extraction failed: Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 880, in _decrypt_signature
return func(s)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 448, in
return lambda s: initial_function([s])
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 113, in resf
res = self.interpret_statement(stmt, local_vars)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 45, 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 58, in interpret_expression
val = local_vars[m.group('in')]
KeyError: u'lo'

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 88 (44.43), itag 43, html5 player en_US-vflqZIm5b
WARNING: Automatic signature extraction failed: Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 880, in _decrypt_signature
return func(s)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 448, in
return lambda s: initial_function([s])
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 113, in resf
res = self.interpret_statement(stmt, local_vars)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 45, 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 58, in interpret_expression
val = local_vars[m.group('in')]
KeyError: u'lo'

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 88 (44.43), itag 18, html5 player en_US-vflqZIm5b
WARNING: Automatic signature extraction failed: Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 880, in _decrypt_signature
return func(s)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 448, in
return lambda s: initial_function([s])
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 113, in resf
res = self.interpret_statement(stmt, local_vars)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 45, 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 58, in interpret_expression
val = local_vars[m.group('in')]
KeyError: u'lo'

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 88 (44.43), itag 5, html5 player en_US-vflqZIm5b
WARNING: Automatic signature extraction failed: Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 880, in _decrypt_signature
return func(s)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 448, in
return lambda s: initial_function([s])
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 113, in resf
res = self.interpret_statement(stmt, local_vars)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 45, 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 58, in interpret_expression
val = local_vars[m.group('in')]
KeyError: u'lo'

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 88 (44.43), itag 36, html5 player en_US-vflqZIm5b
WARNING: Automatic signature extraction failed: Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 880, in _decrypt_signature
return func(s)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 448, in
return lambda s: initial_function([s])
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 113, in resf
res = self.interpret_statement(stmt, local_vars)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 45, 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 58, in interpret_expression
val = local_vars[m.group('in')]
KeyError: u'lo'

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 88 (44.43), itag 17, html5 player en_US-vflqZIm5b
WARNING: Automatic signature extraction failed: Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 880, in _decrypt_signature
return func(s)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 448, in
return lambda s: initial_function([s])
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 113, in resf
res = self.interpret_statement(stmt, local_vars)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 45, 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 58, in interpret_expression
val = local_vars[m.group('in')]
KeyError: u'lo'

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 87 (43.43), itag 137, html5 player en_US-vflqZIm5b
[youtube] KlyDYI_ddZY: Downloading js player vflqZIm5b
WARNING: Writing cache to u'/Users/carlos.marin/.cache/youtube-dl/youtube-sigfuncs/js_vflqZIm5b_87.json' failed: Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 390, in _extract_signature_function
cache_res = res(test_string)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 448, in
return lambda s: initial_function([s])
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 113, in resf
res = self.interpret_statement(stmt, local_vars)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 45, 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 58, in interpret_expression
val = local_vars[m.group('in')]
KeyError: u'lo'

WARNING: Automatic signature extraction failed: Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 880, in _decrypt_signature
return func(s)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 448, in
return lambda s: initial_function([s])
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 113, in resf
res = self.interpret_statement(stmt, local_vars)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 45, 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 58, in interpret_expression
val = local_vars[m.group('in')]
KeyError: u'lo'

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 87 (43.43), itag 248, html5 player en_US-vflqZIm5b
WARNING: Automatic signature extraction failed: Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 880, in _decrypt_signature
return func(s)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 448, in
return lambda s: initial_function([s])
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 113, in resf
res = self.interpret_statement(stmt, local_vars)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 45, 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 58, in interpret_expression
val = local_vars[m.group('in')]
KeyError: u'lo'

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 87 (43.43), itag 136, html5 player en_US-vflqZIm5b
WARNING: Automatic signature extraction failed: Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 880, in _decrypt_signature
return func(s)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 448, in
return lambda s: initial_function([s])
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 113, in resf
res = self.interpret_statement(stmt, local_vars)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 45, 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 58, in interpret_expression
val = local_vars[m.group('in')]
KeyError: u'lo'

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 87 (43.43), itag 247, html5 player en_US-vflqZIm5b
WARNING: Automatic signature extraction failed: Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 880, in _decrypt_signature
return func(s)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 448, in
return lambda s: initial_function([s])
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 113, in resf
res = self.interpret_statement(stmt, local_vars)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 45, 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 58, in interpret_expression
val = local_vars[m.group('in')]
KeyError: u'lo'

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 87 (43.43), itag 135, html5 player en_US-vflqZIm5b
WARNING: Automatic signature extraction failed: Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 880, in _decrypt_signature
return func(s)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 448, in
return lambda s: initial_function([s])
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 113, in resf
res = self.interpret_statement(stmt, local_vars)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 45, 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 58, in interpret_expression
val = local_vars[m.group('in')]
KeyError: u'lo'

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 87 (43.43), itag 244, html5 player en_US-vflqZIm5b
WARNING: Automatic signature extraction failed: Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 880, in _decrypt_signature
return func(s)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 448, in
return lambda s: initial_function([s])
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 113, in resf
res = self.interpret_statement(stmt, local_vars)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 45, 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 58, in interpret_expression
val = local_vars[m.group('in')]
KeyError: u'lo'

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 87 (43.43), itag 134, html5 player en_US-vflqZIm5b
WARNING: Automatic signature extraction failed: Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 880, in _decrypt_signature
return func(s)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 448, in
return lambda s: initial_function([s])
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 113, in resf
res = self.interpret_statement(stmt, local_vars)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 45, 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 58, in interpret_expression
val = local_vars[m.group('in')]
KeyError: u'lo'

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 87 (43.43), itag 243, html5 player en_US-vflqZIm5b
WARNING: Automatic signature extraction failed: Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 880, in _decrypt_signature
return func(s)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 448, in
return lambda s: initial_function([s])
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 113, in resf
res = self.interpret_statement(stmt, local_vars)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 45, 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 58, in interpret_expression
val = local_vars[m.group('in')]
KeyError: u'lo'

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 87 (43.43), itag 133, html5 player en_US-vflqZIm5b
WARNING: Automatic signature extraction failed: Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 880, in _decrypt_signature
return func(s)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 448, in
return lambda s: initial_function([s])
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 113, in resf
res = self.interpret_statement(stmt, local_vars)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 45, 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 58, in interpret_expression
val = local_vars[m.group('in')]
KeyError: u'lo'

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 87 (43.43), itag 242, html5 player en_US-vflqZIm5b
WARNING: Automatic signature extraction failed: Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 880, in _decrypt_signature
return func(s)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 448, in
return lambda s: initial_function([s])
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 113, in resf
res = self.interpret_statement(stmt, local_vars)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 45, 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 58, in interpret_expression
val = local_vars[m.group('in')]
KeyError: u'lo'

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 87 (43.43), itag 160, html5 player en_US-vflqZIm5b
WARNING: Automatic signature extraction failed: Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 880, in _decrypt_signature
return func(s)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 448, in
return lambda s: initial_function([s])
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 113, in resf
res = self.interpret_statement(stmt, local_vars)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 45, 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 58, in interpret_expression
val = local_vars[m.group('in')]
KeyError: u'lo'

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 85 (41.43), itag 140, html5 player en_US-vflqZIm5b
[youtube] KlyDYI_ddZY: Downloading js player vflqZIm5b
WARNING: Writing cache to u'/Users/carlos.marin/.cache/youtube-dl/youtube-sigfuncs/js_vflqZIm5b_85.json' failed: Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 390, in _extract_signature_function
cache_res = res(test_string)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 448, in
return lambda s: initial_function([s])
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 113, in resf
res = self.interpret_statement(stmt, local_vars)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 45, 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 58, in interpret_expression
val = local_vars[m.group('in')]
KeyError: u'lo'

WARNING: Automatic signature extraction failed: Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 880, in _decrypt_signature
return func(s)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 448, in
return lambda s: initial_function([s])
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 113, in resf
res = self.interpret_statement(stmt, local_vars)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 45, 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 58, in interpret_expression
val = local_vars[m.group('in')]
KeyError: u'lo'

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 87 (43.43), itag 171, html5 player en_US-vflqZIm5b
WARNING: Automatic signature extraction failed: Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 880, in _decrypt_signature
return func(s)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 448, in
return lambda s: initial_function([s])
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 113, in resf
res = self.interpret_statement(stmt, local_vars)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 45, 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 58, in interpret_expression
val = local_vars[m.group('in')]
KeyError: u'lo'

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 88 (44.43), itag 137, html5 player en_US-vflqZIm5b
WARNING: Automatic signature extraction failed: Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 880, in _decrypt_signature
return func(s)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 448, in
return lambda s: initial_function([s])
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 113, in resf
res = self.interpret_statement(stmt, local_vars)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 45, 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 58, in interpret_expression
val = local_vars[m.group('in')]
KeyError: u'lo'

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 88 (44.43), itag 248, html5 player en_US-vflqZIm5b
WARNING: Automatic signature extraction failed: Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 880, in _decrypt_signature
return func(s)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 448, in
return lambda s: initial_function([s])
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 113, in resf
res = self.interpret_statement(stmt, local_vars)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 45, 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 58, in interpret_expression
val = local_vars[m.group('in')]
KeyError: u'lo'

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 88 (44.43), itag 136, html5 player en_US-vflqZIm5b
WARNING: Automatic signature extraction failed: Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 880, in _decrypt_signature
return func(s)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 448, in
return lambda s: initial_function([s])
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 113, in resf
res = self.interpret_statement(stmt, local_vars)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 45, 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 58, in interpret_expression
val = local_vars[m.group('in')]
KeyError: u'lo'

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 88 (44.43), itag 247, html5 player en_US-vflqZIm5b
WARNING: Automatic signature extraction failed: Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 880, in _decrypt_signature
return func(s)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 448, in
return lambda s: initial_function([s])
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 113, in resf
res = self.interpret_statement(stmt, local_vars)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 45, 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 58, in interpret_expression
val = local_vars[m.group('in')]
KeyError: u'lo'

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 88 (44.43), itag 135, html5 player en_US-vflqZIm5b
WARNING: Automatic signature extraction failed: Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 880, in _decrypt_signature
return func(s)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 448, in
return lambda s: initial_function([s])
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 113, in resf
res = self.interpret_statement(stmt, local_vars)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 45, 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 58, in interpret_expression
val = local_vars[m.group('in')]
KeyError: u'lo'

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 88 (44.43), itag 244, html5 player en_US-vflqZIm5b
WARNING: Automatic signature extraction failed: Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 880, in _decrypt_signature
return func(s)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 448, in
return lambda s: initial_function([s])
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 113, in resf
res = self.interpret_statement(stmt, local_vars)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 45, 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 58, in interpret_expression
val = local_vars[m.group('in')]
KeyError: u'lo'

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 88 (44.43), itag 134, html5 player en_US-vflqZIm5b
WARNING: Automatic signature extraction failed: Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 880, in _decrypt_signature
return func(s)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 448, in
return lambda s: initial_function([s])
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 113, in resf
res = self.interpret_statement(stmt, local_vars)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 45, 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 58, in interpret_expression
val = local_vars[m.group('in')]
KeyError: u'lo'

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 88 (44.43), itag 243, html5 player en_US-vflqZIm5b
WARNING: Automatic signature extraction failed: Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 880, in _decrypt_signature
return func(s)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 448, in
return lambda s: initial_function([s])
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 113, in resf
res = self.interpret_statement(stmt, local_vars)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 45, 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 58, in interpret_expression
val = local_vars[m.group('in')]
KeyError: u'lo'

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 88 (44.43), itag 133, html5 player en_US-vflqZIm5b
WARNING: Automatic signature extraction failed: Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 880, in _decrypt_signature
return func(s)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 448, in
return lambda s: initial_function([s])
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 113, in resf
res = self.interpret_statement(stmt, local_vars)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 45, 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 58, in interpret_expression
val = local_vars[m.group('in')]
KeyError: u'lo'

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 88 (44.43), itag 242, html5 player en_US-vflqZIm5b
WARNING: Automatic signature extraction failed: Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 880, in _decrypt_signature
return func(s)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 448, in
return lambda s: initial_function([s])
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 113, in resf
res = self.interpret_statement(stmt, local_vars)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 45, 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 58, in interpret_expression
val = local_vars[m.group('in')]
KeyError: u'lo'

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 88 (44.43), itag 160, html5 player en_US-vflqZIm5b
WARNING: Automatic signature extraction failed: Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 880, in _decrypt_signature
return func(s)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 448, in
return lambda s: initial_function([s])
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 113, in resf
res = self.interpret_statement(stmt, local_vars)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 45, 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 58, in interpret_expression
val = local_vars[m.group('in')]
KeyError: u'lo'

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 88 (44.43), itag 140, html5 player en_US-vflqZIm5b
WARNING: Automatic signature extraction failed: Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 880, in _decrypt_signature
return func(s)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 448, in
return lambda s: initial_function([s])
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 113, in resf
res = self.interpret_statement(stmt, local_vars)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 45, 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 58, in interpret_expression
val = local_vars[m.group('in')]
KeyError: u'lo'

WARNING: Warning: Falling back to static signature algorithm
[youtube] encrypted signature length 88 (44.43), itag 171, html5 player en_US-vflqZIm5b
WARNING: Automatic signature extraction failed: Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 880, in _decrypt_signature
return func(s)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 448, in
return lambda s: initial_function([s])
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 113, in resf
res = self.interpret_statement(stmt, local_vars)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/jsinterp.py", line 45, 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 58, in interpret_expression
val = local_vars[m.group('in')]
KeyError: u'lo'

WARNING: Warning: Falling back to static signature algorithm
ERROR: unable to download video data: HTTP Error 403: Forbidden
Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/youtube_dl/YoutubeDL.py", line 1020, in process_info
success = dl(filename, info_dict)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/YoutubeDL.py", line 996, in dl
return fd.download(name, info)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/downloader/common.py", line 291, in download
return self.real_download(filename, info_dict)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/downloader/http.py", line 58, in real_download
data = self.ydl.urlopen(request)
File "/usr/local/lib/python2.7/site-packages/youtube_dl/YoutubeDL.py", line 1225, in urlopen
return self._opener.open(req, timeout=self._socket_timeout)
File "/usr/local/Cellar/python/2.7.7_1/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 410, in open
response = meth(req, response)
File "/usr/local/Cellar/python/2.7.7_1/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 523, in http_response
'http', request, response, code, msg, hdrs)
File "/usr/local/Cellar/python/2.7.7_1/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 448, in error
return self._call_chain(_args)
File "/usr/local/Cellar/python/2.7.7_1/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 382, in _call_chain
result = func(_args)
File "/usr/local/Cellar/python/2.7.7_1/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 531, in http_error_default
raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)
HTTPError: HTTP Error 403: Forbidden

[phihag]

YouTube changed its signature code on July 15th, 2014. Therefore, only youtube-dl 2014.07.15 and newer support the new signature code format. Update youtube-dl. It looks like you installed it with a package manager, so here are your options:

• Use the package manager to update. Contact the package maintainer if the packaged version is not up-to-date.
• Remove the package and follow our manual installation instructions.

[carlosmarin]

Thank you, it works now!