pip3 install you-get
pip3 install --upgrade you-get

//视频显示视频信息
you-get -i 'https://www.youtube.com/watch?v=jNQXAC9IVRw'
site:                YouTube
title:               Me at the zoo
streams:             # Available quality and codecs
    [ DEFAULT ] _________________________________
    - itag:          43
      container:     webm
      quality:       medium
      size:          0.5 MiB (564215 bytes)
    # download-with: you-get --itag=43 [URL]

    - itag:          18
      container:     mp4
      quality:       medium
    # download-with: you-get --itag=18 [URL]

    - itag:          5
      container:     flv
      quality:       small
    # download-with: you-get --itag=5 [URL]

    - itag:          36
      container:     3gp
      quality:       small
    # download-with: you-get --itag=36 [URL]

    - itag:          17
      container:     3gp
      quality:       small
    # download-with: you-get --itag=17 [URL]

//设置输出文件名或路径
使用--output-dir/-o 设定路径, --output-filename/-O 设定输出文件名:
you-get -o ~/Videos -O zoo.webm 'https://www.youtube.com/watch?v=jNQXAC9IVRw'

//使用 --url/-u 获得页面所有可下载URL列表. 使用 --json以获得JSON格式.
you-get --json http://www.iqiyi.com/v_19rqsyki94.html