pip3 install you-get
you-get -i 'https://player.learningsicp.org/video/282064341' 

you-get -i 'https://player.vimeo.com/video/282064341' 

you-get -i 'https://www.bilibili.com/video/av8515129' 

you-get -i 'https://www.youtube.com/watch?v=jNQXAC9IVRw'