youtube-dl

   1 curl -L https://yt-dl.org/downloads/latest/youtube-dl -o ~/scripts/youtube-dl
   2 chmod 755 ~/scripts/youtube-dl
   3 youtube-dl -F https://www.youtube.com/watch?v=aaaa
   4 # 249          webm       audio only tiny   63k ,
   5 youtube-dl -f 249 https://www.youtube.com/watch?v=aaaa