ios - Changing playback rate of AVPlayer produces choppy Audio -

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i using avplayer in app. app supports change of speed of playback of audio , video. initializing player follows.

 avplayeritem * playeritem= [avplayeritem playeritemwithurl:self.audiourl];      playeritem.audiotimepitchalgorithm = avaudiotimepitchalgorithmspectral;      self.player = [avplayer playerwithplayeritem:playeritem];         self.player.allowsexternalplayback= yes; [self.player.currentitem addobserver:self                                   forkeypath:@"status"                                      options:0                                      context:nil];

and when have change playback rate of audio follows

self.player.rate = 2.0f;

it working fine. when change rate property of avplayer start producing choppy voice. have set audiotimepitchalgorithm 

avaudiotimepitchalgorithmspectral

but still producing choppy voice. can tell me doing wrong, or have avoid choppy voice , produce smooth sound.


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