Posted 16 September 2011 - 09:58 AM
Presuming the .mov file has no audio, just drag it to the Toast Video window with DVD-video selected as the format. Toast will automatically add the .ac3 audio if it has the same file name (except for the extension) and is in the same folder. If it doesn't locate the .ac3 file it will ask you to locate it. You'll be able to see that both the video and audio are present in how Toast describes the video in its window. Toast will encode the video when creating the DVD but will leave the .ac3 audio unchanged.
I'm just a fellow Toast-user so please don't blame Roxio for any misguidance I may provide. And do let me know if your issue gets solved. Cheers from Eugene, Oregon!