[ytdl_hook] ERROR: Signature extraction failed: Traceback (most recent call last):
[ytdl_hook]   File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 905, in _decrypt_signature
[ytdl_hook]     video_id, player_url, s
[ytdl_hook]   File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 820, in _extract_signature_function
[ytdl_hook]     res = self._parse_sig_js(code)
[ytdl_hook]   File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 883, in _parse_sig_js
[ytdl_hook]     initial_function = jsi.extract_function(funcname)
[ytdl_hook]   File "/usr/lib/python2.7/dist-packages/youtube_dl/jsinterp.py", line 241, in extract_function
[ytdl_hook]     raise ExtractorError('Could not find JS function %r' % funcname)
[ytdl_hook] ExtractorError: Could not find JS function u'by'; 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.
[ytdl_hook]  (caused by ExtractorError(u"Could not find JS function u'by'; 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.
[ytdl_hook] youtube-dl failed, trying to play URL directly ... 
[ffmpeg] tls: The TLS connection was non-properly terminated.
Failed to recognize file format.