Here is what I do.....I have a dishplayer 7200 that I can pull the HD out of and rip the video to the HD of my computer. When I am finished ripping I have an M2v and an AC3 or MP2 (mp2 is all I am working on at the current moment). I mux the two files together with tmpgenc and have an MPG file. The first one I did played just fine on the xbox so I thought this was going to be easy....the last four though have not worked....before muxing the tow together the m2v will play just fine without the audio so I don't think the problem is in the video itself I think it is in the audio. I have tried changing bitrates quality and many different utilities on the mp2 to no avail....anyone have any ideas...I can send a copy of the video if someone wants to take a look at it.