Joe, You need to extract the video/audio from the DVD. I am not the expert on this, but I do know that it's not a simple thing. In fact, I had to recreate raw footage as Quicktime to accomplish what you are trying to do, but look at DVD Studio Pro, part of the Final Cut Studio (pricey, but for serious video production, it's one of the best). You might also look at Toast. or search "DVD to video Extraction" in a search engine.
Hope this helps and let me know what you find out.

