I'm using MEP 15 to make music videos and when editing, the audio/video synch is fine but after I export it to mpeg4 the synching gets messed up. I tried the audio/video mixdown but that made it worse. What can I do?
Make sure you have the latest patch for the software. I am not sure if there were issues with version 15 and MPEG 4. Have you tried exporting to another format to test if all formats have a sync issue?