Youtube-dl

From XPUB & Lens-Based wiki

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

Downloading manually added subtitles

 youtube-dl --skip-download --write-sub https://www.youtube.com/watch?v=vP4iY1TtS3s

Downloading only the automatically generated subtitles (in vtt format)

 youtube-dl --skip-download --write-auto-sub URL