I received a DVD which contained a HD-Digital copy on it. I thought that was pretty neat. This was not a Hollywood movie, so it was prolly always 2-channel anyway. But I got a question. When they do 'Digital Copy' like the above, and you end up with the movie on your computer in mp4 format... Can it be in 5.1 or better? Or do Digital copies always lose the HD audio? Is mp4 capable of higher quality?