livestreamer : CLI tool that pipes video streams from services like twitch.tv into a video player ( https://github.com/chrippa/livestreamer )
youtube-dl : Download videos from YouTube.com (and more sites...) ( http://rg3.github.com/youtube-dl )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a lif
For Paludis use this rsync : rsync://gentoo.zugaina.org/lif-portage
If you have a problem : ycarus(-at-)zugaina.org