Is there a tool I can use that can merge MP4 files without throwing the audio out of sync? I generated some MP4 files from a DVD using AVIDemux but whatever tool I try to use always ends up throwing the audio out of sync with the video. The further you get into the video the further off-sync the audio is.
By themselves the MP4/AAC videos have perfect audio-video sync.
later tonight i might try http://www.headbands.com/gspot/ to examine the file before and after to see if anything changed in the media format.