i'm assuming by "vid" you mean DVD
first you need to demux, which leaves you with the audio track [ac3, PCM, etc] & video track [m2v] --
MPEGStreamclip is free and does a fine job
next, take the m2v file and the new audio track and re-sync in your DVD authoring program [DVD Studio Pro is what i'm familiar with, guessing you can do this in iDVD as well]...build the new menus, etc. & yer done
PM me if ya need any help
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