I use Mpeg-Vcr to demultiplex my *.sfd , When you demultiplex it with this program it extract it to a *.m1v and an audio file with the bad extension, you must change it to *.sfa .
Then I downsample my video with Mpeg encoder from panasonic.
Then if I want to downsample my audio I get myself a winamp plugin named in_cube.dll (
http://c9.servage.net/~sc19031-ZCPG/in_cube.html )
Then you open your song with winamp, an choose preference then output and you choose the out_disc.dll and configured it
Now play the song, it gonna be converted to a wav.
Now it's a wav file
Sega movie creator can't multiplex a video file with a mp3,wma,or a file with the wrong extension. so if your file was a sfa or adx ( same thing for sfa or adx) and that the filename was wav because of the demultiplexer, then SEGA MC was all f*cked up !! You MUST put a sfa\adx file with the sfa\adx extension OR a plain WAV file but a REAL one, not only the *.wav Extension...
I hope it'll be of use !!
-=FamilyGuy=-