It's time for Tech Tuesday.
Youtube-dl is pretty much the de-facto way to download a youtube video from the command line for all popular OSes (Windows, Linux, MacOS). You can get it from HERE. You will also need ffmpeg since youtube-dl uses it a lot.
Super straight forward if one wants to download a video only:
$ youtube-dl https://www.youtube.com/watch?v=kJQP7kiw5Fk
The great thing is that one can download also the included subtitles. Here are all the options:
--write-sub Write subtitle file --write-auto-sub Write automatically generated subtitle file (YouTube only) --all-subs Download all the available subtitles of the video --list-subs List all available subtitles for the video --sub-format FORMAT Subtitle format, accepts formats preference, for example: "srt" or "ass/srt/best" --sub-lang LANGS Languages of the subtitles to download (optional) separated by commas, use --list- subs for available language tags
Want to see all available subtitles for a video? No problem:
$ youtube-dl --list-subs --skip-download https://www.youtube.com/watch?v=kJQP7kiw5Fk Available subtitles for kJQP7kiw5Fk: Language formats ja vtt, ttml es vtt, ttml
Want to download english subtitles for the video? Lets try:
$ youtube-dl --write-sub --sub-lang en --skip-download https://www.youtube.com/watch?v=kJQP7kiw5Fk WARNING: en subtitles not available for kJQP7kiw5Fk
Makes sense. From the first command it already told me that the video only has 'ja' and 'es' subtitles included. Thus changing 'en' with 'es' will download the corresponding Spanish subtitles.
However youtube auto-generates subtitles if no translator has attached subtitles to his video. We can use the '--write-auto-sub' option for that:
$ youtube-dl --write-auto-sub --sub-lang en --skip-download https://www.youtube.com/watch?v=kJQP7kiw5Fk [info] Writing video subtitles to: Luis Fonsi - Despacito ft. Daddy Yankee-kJQP7kiw5Fk.en.vtt
Wow! Now I can finally understand!
Bonus Tip: Geo Restricted videos
Ever seen the annoying 'This video is not available in your country' restriction on youtube? Youtube-dl can deal with that too. It has some nifty GEO restriction options.
$ youtube-dl --geo-bypass [Video URL]
Simple as that. Happy off-line watching!