Youtube-dl

Debian

sudo apt-get install youtube-dl

You should also need ffmpeg

sudo nano /etc/apt/sources.list

Add:

deb http://www.deb-multimedia.org jessie main non-free
apt-get update
apt-get install deb-multimedia-keyring
apt-get update
sudo apt-get install ffmpeg
sudo apt-get dist-upgrade

Send an email to: dmo-changes-request@deb-multimedia.org subject:subscribe

Notes

• You may have to:

apt-mark manual deb-multimedia-keyring

• Source: http://www.deb-multimedia.org/dists/stable/main/binary-amd64/