i made a back up of a dvd, i finally got the audio in sync buy now at the begining of the movie the quality is amazingly good, then half way threw the quality looks very bad , like a vhs rip or something , then it goes back to very good about 3 quarters of the way threw the movie. then at the end it is back to very bad quality.... the only thing i can think that is doint this is trying to strech the movie to 3 cd's. would that be my problem ??????