iphone - MPMoviePlayerController slow forward and backward motion -

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possible duplicate:
play/forward video in 2x 3x 4x speed - iphone sdk

i working on video based application. i'm using mpmovieplayercontroller play video had recorded in app. question have play video in slow forward , backward motion in mpmovieplayercontroller?

-(ibaction) playslow:(uibutton *)sender{      if (framerate > 1)          framerate -= 0.5;     else         framerate -= 0.25;      if (framerate < 0) {         framerate=0;     }      queueplayer.rate = framerate; }  -(ibaction) playfast:(uibutton *)sender{      if (framerate < 1)          framerate += 0.25;     else         framerate += 0.50;      if(framerate > 4)         framerate = 4;     queueplayer.rate = framerate; }

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