I know I made a thread a while ago, but couldn't find it to revive it.
I'm still having trouble playing .mp4's on my external TV via the on-board video.
CPU: Intel i7 2600k
Mobo: ASUS P8Z68 V-PRO
It doesn't seem to matter what codec's are used, as long as the file extension is .mp4 it just causes the video player to crash. (Windows Media Player, VLC player whatever)
At the moment I'm still having to convert all my .mp4's to .avi's just so I can watch them on the TV instead of the computer screen.