使用AVPlayer实现流畅的视频清理 [英] Achieve smooth video scrubbing with AVPlayer

问题描述

我正在尝试使用 AVPlayer实现流畅的视频清理通过 UISlider 我搜索过，似乎Apple有一个 Technical Q& A 并解释了如何实现这一目标，但我的问题是如何使用此方法并使用UISlider更改玩家当前时间：
stopPlayingAndSeekSmoothlyToTime（newChaseTime：CMTime）

I am trying to achieve smooth video scrubbing with AVPlayer through UISlider I have searched and it seems Apple has a Technical Q&A and explained how to achieve this, but my problem is how should I use this method and change player current time with a UISlider: stopPlayingAndSeekSmoothlyToTime(newChaseTime:CMTime)

这是我的代码：

//Play Intro Movie
let videoURL = Bundle.main.url(forResource: "intro", withExtension: "mp4")
player = AVPlayer(url:videoURL!)
let playerLayer = AVPlayerLayer(player: player)
playerLayer.frame = self.view.frame
view.layer.addSublayer(playerLayer)
//videoPlayer.play()


view.addSubview(slider)
slider.maximumValue = 0
slider.maximumValue = Float(CMTimeGetSeconds((player.currentItem?.asset.duration)!))

这是Apple示例代码：

Here is Apple sample code :

func stopPlayingAndSeekSmoothlyToTime(newChaseTime:CMTime)
    {
        player.pause()

        if CMTimeCompare(newChaseTime, chaseTime) != 0
        {
            chaseTime = newChaseTime;

            if !isSeekInProgress
            {
                trySeekToChaseTime()
            }
        }
    }




    func trySeekToChaseTime()
    {
        if playerCurrentItemStatus == .unknown
        {
            // wait until item becomes ready (KVO player.currentItem.status)
        }
        else if playerCurrentItemStatus == .readyToPlay
        {
            actuallySeekToTime()
        }
    }


    func actuallySeekToTime()
    {
        isSeekInProgress = true
        let seekTimeInProgress = chaseTime
        player.seek(to: seekTimeInProgress, toleranceBefore: kCMTimeZero,
                          toleranceAfter: kCMTimeZero, completionHandler:
            { (isFinished:Bool) -> Void in

                if CMTimeCompare(seekTimeInProgress, self.chaseTime) == 0
                {
                    self.isSeekInProgress = false
                }
                else
                {
                    self.trySeekToChaseTime()
                }
        })
    }

推荐答案

虽然我没有使用与你一样的方法<$ div c $ c> stopPlayingAndSeekSmoothlyToTime ，我想我应该帮助你寻找玩家的行动。

Although I'm not using the same method as you do which is stopPlayingAndSeekSmoothlyToTime, I thought I should help you with the seeking action of the player.

func sliderValueChanged() {
    var timeToSeek = player.currentItem?.asset.duration.seconds
    timeToSeek = timeToSeek * Double(slider.value)
    player.seek(to: CMTimeMake(Int64(timeToSeek), 1))
}

另外你应该设置 slider.maximumValue 为1.希望这会有所帮助。

Also you should set the slider.maximumValue to 1. Hope this helps.

注意：请不要忘记处理 currentItem 可选值。如果它是 nil ，你应该为 timeToSeek 变量设置值0。

Note: Please don't forget to handle currentItem optional value. If it is nil you should set the value 0 for timeToSeek variable.

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