objective-c - AVPlayer seekToTime 不适用于寻回

Question

我在播放 mp3 文件时有非常奇怪的 seekToTime 行为，不知道如何解决。

这段代码

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

如果秒数大于当前时间，则工作正常，但不对 kCMTimeZero 或秒数小于当前时间执行任何操作。向后查找后状态没有改变。

- (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];
            }
        }
    }
}

Duration为0，“ready”只在forward seek时出现。 avPlayer 是 AVPlayer。

如何正确的向后查找？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

使用 Bass 解决

此外，AudioStreamer有很多错误，但也解决了这个问题。