[英]How to achieve a playback rate of 4.0 with AVPlayer in iOS?
player.rate = 4.0
對我不起作用。
是使用AVPlayer
達到4.0速率的好方法,還是有更好的方法?
使用[AVComposition scaleTimeRange:toDuration:]
生成快速運動的AVAsset
。
float rate = 4.0;
AVAsset *asset = [AVAsset assetWithURL:someURL];
AVMutableComposition *composition = [AVMutableComposition composition];
NSError *error = nil;
[composition insertTimeRange:CMTimeRangeMake(kCMTimeZero, asset.duration)
ofAsset:asset
atTime:kCMTimeZero error:&error];
[composition scaleTimeRange:CMTimeRangeMake(kCMTimeZero, asset.duration)
toDuration:CMTimeMultiplyByFloat64(asset.duration, 1 / rate)];
AVPlayerItem *playerItem = [AVPlayerItem playerItemWithAsset:composition];
AVPlayer *player = [AVPlayer playerWithPlayerItem:playerItem];
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