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I have a "Zoom in" Animation Video that is played when switching from one view to a subview. When switching back to the main view, i tried to play the same video backwards like that:

MPMoviePlayerController *mp;
.... 
mp.currentPlaybackTime = mp.duration;  
mp.currentPlaybackRate = -1.0;

but occasionally the video freezes at some point for exactly the time that is left to play. The Foreward Video is played the same way just without the 2 lines above and never freezes.

Is there anything i've missed or maybe another way to play videos backward? Otherwise i will have to render the movie backwards and just play 2 different movies.