I built and put gstreamer0.10-plugins-ffmpeg into extras-devel this morning.

This should handle some of the quirkier video and audio codecs found in files.

A word of warning, the library takes 5MB in root so maybe I should move it to /home/user/.gstreamer-0.10/plugins/ for my next package upload.

UPDATE: also vp6 which is not quirky This will require flvdemux to play flv files, which I will try and package later today.