Ok, I feel like I've looked everywhere and can't find an answer to this. I'm trying to make an m4v video file like what you would find when you download a movie from itunes and it has stereo, and surround sound options. I have been able to make a .mov file with stereo pcm and surround pcm using logic pro and importing the movie and exporting audio to movie in my surround session, but keeping the stereo track that was already on the movie. But what i need is stereo .aac and surround .ac3 in a .m4v file. I brought the above .mov file into compressor and used the apple tv setting with the "include 5.1 " box checked. I submitted it and it failed (failed: 3x crash service down) but it gave me a .m4v-1 file (not sure why the -1 is there) that had stereo, but no surround sound (I checked using qt pro 7 show movie properties). It also gave me a separate .ac3 file. I tried this with another .mov file with only the surround sound mix and the same thing happened. also, it seems that no matter what aspect ratio i set apple tv to, it takes my 720x480 file and makes it square. here are the specs of the source video I'm trying to convert: Apple MPEG-2 Camcorder Video, 720 x 480 (853 x 480), Millions 16-bit Integer (Little Endian), Stereo (L R), 48.000 kHz 16-bit Integer (Little Endian), 5.1 (L R C LFE Ls Rs), 48.000 kHz also, when compressor fails, it adds 3 files with a .m4vTEMPdataRef157800 extension but the numbers on the end change. If anyone has a solution to this I would be very thankful.