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For more detail on VOB's, see this ARTICLE, plus Colin's method of ripping at the end.
One problem with VOB's is that they can be spanned, with the MPEG 2's inside. That is probably where you are running into problems, the spanning of VOB's, that can only be ~ 1 GB in size.
Were I in your position, I would handle things in a different workflow, but then I have the equipment on hand. I would load the DVD into my VHS/DVD player, hooked to my Canopus 300 via FireWire, and just hit Play while doing a Capture. I would choose PCM/WAV (not MP3 which will recompress a compressed, most likely, Audio format). Then, I would rip the Audio from the DV-AVI file, and use that. One could do the same with a DVD player and a miniDV tape camera, with both pass-through capabilities, and also a FW connection.
Thank you very much, (and also for the answers you’ve provided to others, as well. Read quite a few and they have been great help).
You are most welcome. We all try very hard to solve everybody's problems.
Good luck, and happy editing,