With this server setup you can convert most files
Mplayer + Mencoder (
http://www.mplayerhq.hu/design7/dload.html)
LAME MP3 Encoder (
http://lame.sourceforge.net)
Flv2tool (
http://inlet-media.de/flvtool2)
Libogg + Libvorbis (
http://www.xiph.org/downloads)
FFmpeg (
http://ffmpeg.mplayerhq.hu)
MP4Box (Needed if you want to enable HD video conversion)
avi mpg mov asf mpeg xvid divx 3gp mkv 3gpp mp4 rmvb rm dat wmv flv ogg