Hello, These forums have been really helpful to me in the past and I am hoping someone can give me some tips again. Here's the challenge to me: I received a disc that is a groupof MP4 files. While I copy a second disc with Nero, it tells me the action was successful and I can see the video on the small screen as it encodes and copys. When I play the disc on my DVD player, it tells me " unknown disc " and my PC tells me the disc is blank. I know I have something missing as a friend made a copy for himself using a DVD copier item away from his PC. Anyone ever had this problem ? Thanks for any tips.