Universal Media Server | Forum

I have a perfectly standard AVC/2ch LC-AAC in .mp4 that I know my 360 can play (moving it to a USB stick and playing from there worked flawlessly). However, UMS starts transcoding it when I attempt to play it, and if I add mp4 to the list of file extensions to force direct playback on, it just won't start playing the file at all (displays the "circle with a line through it"-error sign). What do?

I think its because in the XBOX360.conf the option for 6 channel [5.1 audio] is set now... ( a:6)

try changing it back to a:2 and see if you get the same result.