video - How do I merge MP4 files without audio going out of sync?

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.

Answer

Avidemux should do it without problems, which one are you using?

Try the latest SVN build MuldeR builds, I've never had a problem of not synced audio with it.

Anyway, as the container is mp4 mp4box may come handy. I suggest you use the latest development build (0.4.6 at the time of writing). If you need a GUI frontend for it, take a look at YAMB or My MP4box GUI.

I you don't mind the container, I suggest Matroska (it's quite flexible, scalable and adds little overhead as a container). Use MKVToolnix if you decide to use that container.

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