How to download videos from Youtube?

Download youtube-dl and ffmpeg

brew install youtube-dl
brew install ffmpeg

Re-direct to your video directory

cd your_video_dir

Download video

youtube-dl https://www.youtube.com/watch?v=???
or
youtube-dl https://www.youtube.com/watch?v=??? -f mp4

Insert subtitle

get subtitle

youtube-dl https://www.youtube.com/watch?v=Qkf4farak1k --list-subs

download

youtube-dl https://www.youtube.com/watch?v=??? --write-sub --embed-sub --sub-lang zh-CN -f mp4

Others

Check website

youtube-dl \--list-extractors

Update

youtube-dl -U

Help

youtube-dl -h