I do this a lot. You must first create the video mpeg file and then create the audio file, and then mux them together for the finished DVD. I use Womble Video Wizard DVD to do the muxing, and Adobe Audition to create 5.1 Dolby Surround sound from the audio file. There are free progs to do all of this too. Virtual DUB, VOB edit, Muxman etc.