Video speed is lke 3x normal when I play it in a device...

Question

Thing is, when I test my movie on the iphone simulator, the video speed is ok, but when I play it on the device, an iPhone, the video speed is like 3x faster than normal...

This is my code:

  mMoviePlayer = [ [MPMoviePlayerViewController alloc] initWithContentURL:[self movieURL]   ];

    mMoviePlayer.moviePlayer.controlStyle = MPMovieControlStyleNone;
    mMoviePlayer.moviePlayer.scalingMode = MPMovieScalingModeAspectFill;
    [self presentMoviePlayerViewControllerAnimated:mMoviePlayer];
[mMoviePlayer.moviePlayer play];