I been using Tversity to stream to my Xbox from my PC. I am able to play all of the video format I have except Mp4. Ive been playing with the settings but I still cant get it to play. I also read that if Windows media player is able to play it on my PC, then I should be able to stream it to the Xbox. Yes my WMP on my PC is able of play Mp4 but still I cant get it on the Xbox.