ios – 使用240FPS的默认Slo-Mo相机功能的音频慢动作

我想实现慢动作视频像Slo-Mo相机的Defalut功能,我使用下面的代码,它适用于视频.
但在音频轨道中该视频无法正常工作.

double videoScaleFactor =8.0;


 compositionAudioTrack scaleTimeRange:CMTimeRangeMake(kCMTimeZero,videoDuration)
                                     toDuration:CMTimeMake(videoDuration.value* videoScaleFactor,videoDuration.timescale)];
 [compositionVideoTrack scaleTimeRange:CMTimeRangeMake(kCMTimeZero,videoDuration)
   toDuration:CMTimeMake(videoDuration.value* videoScaleFactor,videoDuration.timescale)];

 this scenario is woking properly for video slowmotion.But in audio slow-motion it is not working...

请帮我..

解决方法

我找到了Audio SlowMotion的解决方案

double videoScaleFactor = 8.0;

[compositionAudioTrack scaleTimeRange：CMTimeRangeMake(kCMTimeZero,videoDuration)
toDuration：CMTimeMake(videoDuration.value * videoScaleFactor,videoDuration.timescale)];

它工作正常但不能在AVPlayer中工作
所以为此你必须设置AVPlayerItem的以下属性

AVPlayerItem * playerItem = nil;

playerItem.audioTimePitchAlgorithm = AVAudioTimePitchAlgorithmVarispeed;