Have you demultiplexed the mpeg ? You will need to work on the audio in Audacity or some audio editing program, once you have all 6 files (2 audio and 1 mpeg for each half) then you need a DVD authoring program that allows you to use two audio sources. Tmpgenc should split without re-encoding, I also have used Womble Mpeg wizard
http://www.womble.com/download/index.html
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