These ebuilds come from http://farragut.flameeyes.is-a-geek.org.
If you have some problems, go to the official site first.
ffmpeg : Complete solution to record, convert and stream audio and video ( http://ffmpeg.org/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a zugaina
For Paludis use this rsync : rsync://gentoo.zugaina.org/zugaina-portage
If you have a problem : ycarus(-at-)zugaina.org