Can't work

[songbaoqiang]

vincents-MacBook-Pro:~ vincentsung$ youtube-dl -v --all-subs http://www.cbsnews.com/news/60-minutes-presents-a-night-at-the-movies/
[debug] System config: []
[debug] User config: []
[debug] Command-line args: [u'-v', u'--all-subs', u'http://www.cbsnews.com/news/60-minutes-presents-a-night-at-the-movies/']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2016.03.06
[debug] Python version 2.7.10 - Darwin-15.6.0-x86_64-i386-64bit
Traceback (most recent call last):
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/runpy.py", line 162, in _run_module_as_main
"main", fname, loader, pkg_name)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/runpy.py", line 72, in _run_code
exec code in run_globals
File "/usr/local/bin/youtube-dl/main.py", line 19, in
File "/usr/local/bin/youtube-dl/youtube_dl/init.py", line 412, in main
File "/usr/local/bin/youtube-dl/youtube_dl/init.py", line 379, in _real_main
File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 348, in init
File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 1970, in print_debug_header
File "/usr/local/bin/youtube-dl/youtube_dl/postprocessor/ffmpeg.py", line 51, in get_versions
File "/usr/local/bin/youtube-dl/youtube_dl/postprocessor/ffmpeg.py", line 35, in init
File "/usr/local/bin/youtube-dl/youtube_dl/postprocessor/ffmpeg.py", line 92, in _determine_executables
File "/usr/local/bin/youtube-dl/youtube_dl/postprocessor/ffmpeg.py", line 92, in
File "/usr/local/bin/youtube-dl/youtube_dl/utils.py", line 1565, in get_exe_version
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 710, in init
errread, errwrite)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 1334, in _execute_child
child_exception = pickle.loads(data)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/pickle.py", line 1382, in loads
return Unpickler(file).load()
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/pickle.py", line 858, in load
dispatchkey
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/pickle.py", line 966, in load_string
raise ValueError, "insecure string pickle"

[yan12125]

Duplicate of #6840. Use Python 2.7.12 as a workaround. See discussions there for other workarounds.

[songbaoqiang]

Thank you. install libav will ok.