Stahování audia/videa z YouTube.

http://rg3.github.io/youtube-dl/

apt install -t stretch-backports youtube-dl (novější verze pro debian 9 stretch)
apt install youtube-dl

Přehled souborů s videm/audiem, které lze stáhnout.

youtube-dl -F https://www.youtube.com/watch?v=yVpbFMhOAwE
  
[youtube] yVpbFMhOAwE: Downloading webpage
[youtube] yVpbFMhOAwE: Downloading video info webpage
[youtube] yVpbFMhOAwE: Extracting video information
[youtube] yVpbFMhOAwE: Downloading MPD manifest
[info] Available formats for yVpbFMhOAwE:
format code  extension  resolution note
139          m4a        audio only DASH audio   49k , m4a_dash container, mp4a.40.5@ 48k (22050Hz), 1.11MiB
249          webm       audio only DASH audio   61k , opus @ 50k, 1.28MiB
250          webm       audio only DASH audio   80k , opus @ 70k, 1.69MiB
140          m4a        audio only DASH audio   95k , m4a_dash container, mp4a.40.2@128k (44100Hz), 2.18MiB
171          webm       audio only DASH audio  101k , vorbis@128k, 2.13MiB
251          webm       audio only DASH audio  119k , opus @160k, 2.53MiB
278          webm       256x144    144p   97k , webm container, vp9, 30fps, video only, 1.87MiB
160          mp4        256x144    DASH video  110k , avc1.42c00c, 15fps, video only, 2.50MiB
242          webm       426x240    240p  222k , vp9, 30fps, video only, 3.06MiB
133          mp4        426x240    DASH video  249k , avc1.4d4015, 30fps, video only, 5.60MiB
243          webm       640x360    360p  406k , vp9, 30fps, video only, 6.09MiB
134          mp4        640x360    DASH video  611k , avc1.4d401e, 30fps, video only, 6.23MiB
244          webm       854x480    480p  758k , vp9, 30fps, video only, 11.00MiB
135          mp4        854x480    DASH video 1141k , avc1.4d401f, 30fps, video only, 12.77MiB
247          webm       1280x720   720p 1554k , vp9, 30fps, video only, 22.36MiB
136          mp4        1280x720   DASH video 2270k , avc1.4d401f, 30fps, video only, 24.54MiB
248          webm       1920x1080  1080p 2859k , vp9, 30fps, video only, 44.70MiB
137          mp4        1920x1080  DASH video 4135k , avc1.640028, 30fps, video only, 44.55MiB
17           3gp        176x144    small , mp4v.20.3, mp4a.40.2@ 24k
36           3gp        320x180    small , mp4v.20.3, mp4a.40.2
43           webm       640x360    medium , vp8.0, vorbis@128k
18           mp4        640x360    medium , avc1.42001E, mp4a.40.2@ 96k
22           mp4        1280x720   hd720 , avc1.64001F, mp4a.40.2@192k (best)

Stáhnout vybraný soubor.

youtube-dl -f 171 https://www.youtube.com/watch?v=yVpbFMhOAwE