Use

#List all format
youtube-dl -F url
youtube-dl -f best url

#use proxy
youtube-dl --proxy socks5://127.0.0.1:1080 url

#select playlist
youtube-dl --playlist-start 2 --playlist-end 5 url
youtube-dl --playlist-items 1,3-5 url

#only audio mp3
youtube-dl -x --audio-format mp3 url

#指定长度
youtube-dl -x --audio-format mp3 --postprocessor-args "-ss 00:00:53 -to 00:01:20" https://youtu.be/NjTT5_RSkw4
or
ffmpeg -i input_video.mp4 -ss 00:01:00 -to 00:03:00 -c copy output_video.mp4

Config

~/.config/youtube-dl/config

# Use this proxy
--proxy 127.0.0.1:3128

# Save all videos under Movies directory in your home directory
-o ~/Movies/%(title)s.%(ext)s

Reference