@RMS: I'm not at home so I can't check, but do have tried Blender?
It's one of its tasks!
And it already uses ffmpeg to do that...

Check Blender 2.52 please:

http://www.yomgui.fr/blender/blender-2.5alpha2-test-mos.lha

I don't remember if I've enabled FFMPEG lib code or not.
As Fab, my hands are full also

[edit]
Seems that Blender-2.52 crashes on MOS when we try to edit some videos. I'll check that ASAP and if fixed upload a new release.

Anyway, it's totally not clever to start a bounty to create a new software to do that, better efforts shall be done to finalize Blender on MorphOS: if some developpers want to enter in the game, they're welcome

[ Edited by Yomgui on 2010/9/22 17:47 ]