If the DVD has menus you should just replace the audio using
this tutorial.
If your DVD has no menu just de-multiplex the DVD and reauthor it with the new audio.
The major problem on this kind of stuff you're trying to do is that the video and audio can be out of sync. The resync part it's the hardest part. I can't explain the resync part 'cause I don't have the vocabulary necessary to do that. Maybe a better English speaker can explain you that. Or you can search on forum.videohelp.com
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