コマンドラインからyoutubeを再生する

$ brew install youtube-dl mplayer

$ sudo apt-get install youtube-dl mplayer

https://yt-dl.org/latest/youtube-dl.exe

http://oss.netfarm.it/mplayer-win32.php

$ sudo youtube-dl -U # -U/--update
# or
youtube-dl -U

$ sudo apt-get install python-pip # if needed
$ sudo pip install youtube-dl

$ sudo pip install -U youtube-dl # -U/--update

$ youtube-dl 'https://www.youtube.com/watch?v=hoge' -o - | mplayer -

$ youtube-dl 'https://www.youtube.com/watch?v=hoge' -o - | mplayer - -novideo

$ youtube-dl 'https://www.youtube.com/watch?v=hoge' -f bestaudio -o - | mplayer -

$ mpv 'https://www.youtube.com/watch?v=hoge'

$ mpv 'https://www.youtube.com/watch?v=hoge' --no-video # or -no-video