这个方法是官方的安装方法，我这里做下收藏。以便以后有需要的时候使用。

GitHub ：
https://github.com/ytdl-org/youtube-dl
https://github.com/FFmpeg/FFmpeg
https://github.com/develon2015/SpringDependent

https://ytdl-org.github.io/youtube-dl/download.html
开发后的程序：https://github.com/develon2015/Youtube-dl-REST https://y2b.githmb.com/

To install it right away for all UNIX users (Linux, OS X, etc.), type:

sudo curl -L https://yt-dl.org/downloads/latest/youtube-dl -o /usr/local/bin/youtube-dl
sudo chmod a+rx /usr/local/bin/youtube-dl

If you do not have curl, you can alternatively use a recent wget:

sudo wget https://yt-dl.org/downloads/latest/youtube-dl -O /usr/local/bin/youtube-dl
sudo chmod a+rx /usr/local/bin/youtube-dl

You can also use pip:

sudo pip install --upgrade youtube_dl

This command will update youtube-dl if you have already installed it. See the pypi page for more information.

You can use Homebrew if you have it:

brew install youtube-dl

To check the signature, type:

sudo wget https://yt-dl.org/downloads/latest/youtube-dl.sig -O youtube-dl.sig
gpg --verify youtube-dl.sig /usr/local/bin/youtube-dl
rm youtube-dl.sig