winding218 discovered the cause of the Metal Slug-X desyncs:
http://tasvideos.org/forum/viewtopic.php?p=217064#217064
The sample rate of playback and recording must match. (I tried messing with
the other settings he mentioned and it didn't affect sync.)
The sensible solution is to write the sample rate in the fbm header and
force playback to conform to it. Snes9x and gens do something similar, I think.
Original issue reported on code.google.com by
dammi...@hotmail.comon 22 Nov 2009 at 5:39