I have a full HD MOV file taken with a Cannon 7D camera and it plays fine. I tried to convert it to mp4 but audio is running at about twice the speed of the video. I am running it with Windows 7 on a Dell gaming computer with DualQuad processors (8 processors) and full memory expanded so resources should not be a problem. I tried do it again converting it from MOV to DVD and got the same results. Very disappointed.