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Я разработал приложение для воспроизведения музыки iOS, используя Objective-C. Но иногда AVPlayer не издает случайных звуков с помощью AVMutableComposition.

здесь нет никаких звуков проблемного кода

                 MPMediaItem* mediaItem = [songObj mediaItem];
                NSURL* assetUrl = [mediaItem valueForProperty:MPMediaItemPropertyAssetURL];
                
                self.mediaAsset_A = [AVAsset assetWithURL:assetUrl];
                
                AVMutableComposition* myMutableComposition = [AVMutableComposition composition];
                NSError* error = nil;
                [myMutableComposition insertTimeRange:CMTimeRangeMake(self.startPoint, self.reSampledDuration) ofAsset:self.mediaAsset_A atTime:kCMTimeZero error:amp;error];

                if(error)
                    NSLog(@"Insertion error: %@", error);
                
                AVComposition *composition = [myMutableComposition copy];
              
                self.mediaAsset_A = (AVAsset*) composition;

                [self.mediaAsset_A loadValuesAsynchronouslyForKeys:@[@"duration"] completionHandler:^{
                   
                    AVPlayerItem* playerItem = [AVPlayerItem playerItemWithAsset:self.mediaAsset_A];

                    if (self.mediaPlayer_A)
                        [self.mediaPlayer_A replaceCurrentItemWithPlayerItem:playerItem];
                    else
                        self.mediaPlayer_A = [AVPlayer playerWithPlayerItem:playerItem];
                }];

                [self.mediaPlayer_A play];
 

если я не использую AVMutableComposition, и тогда AVPlayer работает хорошо.

                 MPMediaItem* mediaItem = [songObj mediaItem];
                NSURL* assetUrl = [mediaItem valueForProperty:MPMediaItemPropertyAssetURL];
                
                self.mediaAsset_A = [AVAsset assetWithURL:assetUrl];
                
                [self.mediaAsset_A loadValuesAsynchronouslyForKeys:@[@"duration"] completionHandler:^{
                   
                    AVPlayerItem* playerItem = [AVPlayerItem playerItemWithAsset:self.mediaAsset_A];

                    if (self.mediaPlayer_A)
                        [self.mediaPlayer_A replaceCurrentItemWithPlayerItem:playerItem];
                    else
                        self.mediaPlayer_A = [AVPlayer playerWithPlayerItem:playerItem];
                }];

                [self.mediaPlayer_A play];
 

Итак, я не уверен, почему AVPlayer не издает случайных звуков с помощью AVMutableComposition. Помогите мне найти решение.