avidemux : Video editor designed for simple cutting, filtering and encoding tasks ( http://fixounet.free.fr/avidemux )
avinfo : Utility for displaying AVI information ( http://shounen.ru/soft/avinfo/english.shtml )
video-mv : Frontends for using mplayer/mencoder, ffmpeg/libav, or tzap as video recorder ( https://github.com/vaeth/video-mv/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a mv
For Paludis use this rsync : rsync://gentoo.zugaina.org/mv-portage
If you have a problem : ycarus(-at-)zugaina.org