AVPlayer seekToTime 旋转披萨

Question

我有一个简单的基于 AVPlayer 的 OS X 应用程序可以播放本地媒体。它具有基于-seekToTime: 的向前和向后跳跃功能。在某些媒体上，在让媒体继续播放（尤其是向前播放）时会有令人讨厌的 3-7 秒延迟。我试过 - seekToTime:toleranceBefore:toleranceAfter: ，公差可变。运气不好。

Answer 1

发布以前解决的问题以供记录...我注意到 seekToTime: skipping 在播放暂停时工作正常。我立即（即几周后）意识到在搜索之前停止播放然后重新启动可能是有意义的。至此，问题已经100%解决，而且速度非常快。可能对尝试平滑循环的人有用（但我不知道如何触发完成处理程序以指示循环结束）。不知道它是否适用于 iOS。附示例代码：

-(void) movePlayheadToASpecificTime
{
    // assumes this is a method for an AVPlayerView subclass, properly wired with IB
    // self.player is a property of AVPlayerView, which points to an AVPlayer

    // save the current rate
    float currentPlayingRate = self.player.rate;

    // may need fancier tweaking if the time scale changes within asset
    int32_t timeScale = self.player.currentItem.asset.duration.timescale;

    // stop playback
    self.player.rate = 0;

    Float64 desiredTimeInSeconds = 4.5; // or whatever

    // convert desired time to CMTime
    CMTime target = CMTimeMakeWithSeconds(desiredTimeInSeconds, timeScale);

    // perform the move
    [self.player seekToTime:target];

    // restore playing rate
    self.player.rate = currentPlayingRate;

}

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