FFpeg is not a good program and have lots of bugs
The best option for you Amiga Menace if you wanna play videos on the amiga is using VirtualDub on windows to convert a video file to a fast avi format..using codecs like indeo 3/4...then you can play them without frame skip on the amiga using moovid or froggerng
is the fast way cause even you don't need a ppc...a 040 or 060 can play that videos without any frame skip
and you will not have audio sync problems
VirtualDub is the great freeware and most acclaimed program for Windows...get it
bye, Laser