How do I add another audio stream to an MP4 file?

Posted by RandomEngy on Super User See other posts from Super User or by RandomEngy
Published on 2009-10-10T23:20:55Z Indexed on 2010/03/11 4:41 UTC
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I've got an MP4 video file and I want to add another AAC audio track to it. I've tried YAMB and MeGUI (frontends for MP4Box) and it plays correctly in Zoom Player, but it picks the wrong track in WMP and plays both at once in Quicktime. I think this might have to do with designating the default audio track somehow.

Does anyone know how to specify the default audio track with YAMB/MeGUI or know of another way of adding a track to an MP4 file?

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