Loading MPMoviePlayerViewController with transparent background?

Question

Hi,

i´ve added a MPMoviePlayerViewController instance and playing of a movie works great. I´ve 3 buttons and want to load different videos in a UIView-container. That works, too. But if i click on a button to load an other video, everytime the background is flickering black. I´ve set the color to "clearColor":

    player.moviePlayer.backgroundView.backgroundColor = [UIColor  clearColor];

But that doesn´t help. Is there a way to load a video without a background - only the video-content?

Thanks for your time.