Please friends, how to tell DVDA to use BOTH of these files - the MPEG for the video and the AC-3 for the audio enconded in Vegas 4 to NOT re-encoded by DVDA?
After you add the movie to a menu, double-click the movie link and the movie will appear on a timeline. On the right-hand side of the screen will be two text boxes - one for video and the other audio. Drag the AC3 file to the audio text box and it will use the AC3 file instead of recompressing from the MPEG file.