Question

我有一个AVPlayer正在流式传输实时HLS流。

当用户多任务应用程序时，我看到播放速率下降到0.0（暂停），当用户返回时它返回到1.0（播放），但是从暂停点开始播放。

在不重新启动流的情况下强制播放器恢复生效的最佳方法是什么？是否有seekToTime方法处理最接近的实时时间参数？

谢谢！

Answer 1

我用：

 double time = MAXFLOAT;
 [player seekToTime: CMTimeMakeWithSeconds(time, NSEC_PER_SEC)];

在我的应用中运行良好。

Answer 2

假设播放器是AVPlayer实例：

CMTimeRange seekableRange = [player.currentItem.seekableTimeRanges.lastObject CMTimeRangeValue];
CGFloat seekableStart = CMTimeGetSeconds(seekableRange.start);
CGFloat seekableDuration = CMTimeGetSeconds(seekableRange.duration);
CGFloat livePosition = seekableStart + seekableDuration;

[player seekToTime:CMTimeMake(livePosition, 1)];

Answer 3

Swift 3.0版本

public func resumeLive() {
    guard let livePosition = player.currentItem?.seekableTimeRanges.last as? CMTimeRange else {
        return
    }
    player.seek(to:CMTimeRangeGetEnd(livePosition))
}

Answer 4

快速版Karim Mourra的回答：

let seekableRanges = player.currentItem!.seekableTimeRanges
guard seekableRanges.count > 0 else {
  return
}

let range = seekableRanges.last!.CMTimeRangeValue
let livePosition = range.start + range.duration

let minus = CMTimeMakeWithSeconds(Float64(timeOffset), Int32(NSEC_PER_SEC))
let time = livePosition - minus

player.seekToTime(time)

Answer 5

如果您使用Apple的CMTimeRange操作函数，则无需转换为浮点数：

NSValue *value = player.currentItem.seekableTimeRanges.lastObject;
if (value) {
    CMTimeRange seekableRange = [value CMTimeRangeValue];
    CMTime latestTime = CMTimeRangeGetEnd(seekableRange);
    [player seekToTime:latestTime];
} else {
    // there are no seekable time ranges
}

编辑：请在下面提名Fabian的评论

Answer 6

快速版Igor Kulagin回答：

player.seek(to: kCMTimePositiveInfinity)
player.play()

在任何条件下都能完美运作。其他解决方案在计算NaN值时出现livePosition错误，或直接与{INVALID}一起使用时出现CMTime错误。

Answer 7

Swift 4版本：

if let seekableRange = player.currentItem?.seekableTimeRanges.last?.timeRangeValue {
    let seekableStart = seekableRange.start
    let seekableDuration = seekableRange.duration
    let livePosition = seekableStart + seekableDuration

    player.seek(to: livePosition, completionHandler: { [weak self] _ in
        self?.player.play()
    })
}

iOS上的HLS AVPlayer - 返回现场

7 个答案: