I'm new to this. I have a question about dvdfab, and I'm not sure how to to get it answered. On the advice of a friend, I downloaded a free trial of dvdfab and plan to purchase it. I use primarily to convert DVDs to avi files, In the configure box you have a choice of avi autocopy or avi mp3. I've tried both.The avi autocopy makes the file considerably larger. So what do you get for the increased size? Thank you