objective c - QTMovie setRate problems -

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i'm working on program prototype (at current stage) needs able load movie , adjust playback speed. have ui worked out, i've gotten playback work, haven't managed figure out how adjust playback speed.

i believed -[qtmovie setrate:(float)] way this, have had no luck. when setting playback speed prior loading movie qtmovieview, movie plays @ 100% speed. have put in textual outputs check @ speed movie "believes" being played, , checks out i've been putting in, movie still displays in view @ 100% speed.

here's code controller:

@interface srplayercontroller : nsobject {     qtmovieview *movieview; } @end  @implementation srplayercontroller -(void) playselectedmovie {     srmovie *srm = [self selectedmovie];         qtmovie *mov = [self movieforsrmovie:srm];      //set play speed     [self setplayspeed:[srm.defaultplayspeed floatvalue] formovie:mov];      //put movie viewer     [movieview setmovie:mov];      //play     [movieview play:self]; }  -(void) setplayspeed:(float)ps formovie:(qtmovie*)movie {     nslog(@"setting play speed %f", ps);      [movie setrate:ps];       nslog(@"movie playing @ speed: %f", [movie rate]); } @end

i appreciate response.

apparently can't adjust playback when it's not playing. had change order of -playselectedmovie calls playing before adjusted speed.


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