AVPlayer seekToTime不为寻回工作

Question

我在播放seekToTime文件时有非常奇怪的mp3行为，无法理解如何修复。

这段代码

    [self.avPlayer seekToTime:CMTimeMakeWithSeconds(seconds, NSEC_PER_SEC) 
                   toleranceBefore:kCMTimeZero
                   toleranceAfter:kCMTimePositiveInfinity];

如果秒大于当前时间，则工作正常，但对kCMTimeZero不做任何操作，如果秒更少，则不做任何操作。向后查找后状态未更改。

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
    if (object == self.avPlayer.currentItem) {
        if ([keyPath isEqualToString:@"status"]) {
            if (self.avPlayer.status == AVPlayerStatusReadyToPlay && self.player.play) {
                NSLog(@"Ready");
                NSLog(@"%lli", self.avPlayer.currentItem.duration.value);
                [self.avPlayer play];
            }
        }
    }
}

持续时间为0，“就绪”仅显示为向前搜索。AVPlayer是avPlayer。

如何正确地向后寻找？谢谢。

更新

NSLog(@"Tracks from asset: %@", self.avPlayer.currentItem.asset.tracks);
NSLog(@"Tracks from file: %@", self.avPlayer.currentItem.tracks);

结果：

Tracks from asset: ()
Tracks from file: (
  "<AVPlayerItemTrack: 0x608000019850, assetTrack = <AVAssetTrack: 0x60000000d2e0, trackID = 1, mediaType = soun>>",
  "<AVPlayerItemTrack: 0x608000019810, assetTrack = <AVAssetTrack: 0x60000000d320, trackID = 2, mediaType = meta>>"
)

Answer 1

用低音求解

而且，AudioStreamer有很多bug，但也解决了这个问题。