To install it right away for all UNIX users (Linux, OS X, etc.), type:

>sudo curl -L https://yt-dl.org/downloads/latest/youtube-dl -o /usr/local/bin/youtube-dl
>sudo chmod a+rx /usr/local/bin/youtube-dl

luego voy al mismo video que tú...

~$ youtube-dl https://www.youtube.com/watch?v=G7LjT4BHoZk


[youtube] G7LjT4BHoZk: Downloading webpage
[youtube] G7LjT4BHoZk: Downloading video info webpage
[youtube] G7LjT4BHoZk: Downloading js player vflK6rDhN
[youtube] G7LjT4BHoZk: Downloading js player vflK6rDhN
ERROR: Signature extraction failed: Traceback (most recent call last):
File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 1355, in _decrypt_signature
video_id, player_url, s
File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 1255, in _extract_signature_function
errnote='Download of %s failed' % player_url)
File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 794, in _download_webpage
expected_status=expected_status)
File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 270, in _download_webpage_handle
*args, **compat_kwargs(kwargs))
File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 660, in _download_webpage_handle
urlh = self._request_webpage(url_or_request, video_id, note, errnote, fatal, data=data, headers=headers, query=query, expected_status=expected_status)
File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 645, in _request_webpage
raise ExtractorError(errmsg, sys.exc_info()[2], cause=err)
ExtractorError: Download of https://www.youtube.com/yts/jsbin/player_ias-vflK6rDhN/en_US/base.js failed: <urlopen error [Errno 104] Connection reset by peer> (caused by URLError(error(104, 'Connection reset by peer'),))
(caused by ExtractorError(u"Download of https://www.youtube.com/yts/jsbin/player_ias-vflK6rDhN/en_US/base.js failed: <urlopen error [Errno 104] Connection reset by peer> (caused by URLError(error(104, 'Connection reset by peer'),))",)); please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type youtube-dl -U to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.