Question

我们将URL中的MP4视频加载到AVPlayer中。 AVPlayer位于骨骼图像的后面，当AVPlayer进入状态“ Ready To Play”时，我们将其隐藏。

我们希望在隐藏骨架图像后立即看到视频的第一帧。但是，视频的第一帧会在稍有延迟后出现。指示AVPlayer中的视频已加载并准备就绪的状态是什么？

func prepareVideo(videoUrl: URL?, owner: UIView, autoStart: Bool = false) {

    self.player = AVPlayer(url: videoUrl!)
    let playerController = AVPlayerViewController()
    playerController.player = player
    playerController.view.layer.shouldRasterize = true
    playerController.view.frame = owner.frame
    playerController.view.isOpaque = true
    playerController.view.backgroundColor = UIColor.clear
    playerController.view.layer.borderColor = UIColor.clear.cgColor
    playerController.view.layer.borderWidth = 0
    playerController.showsPlaybackControls = false
    playerController.updatesNowPlayingInfoCenter = false

    owner.addSubview(playerController.view)
    owner.sendSubview(toBack: playerController.view)
    timerStart() // this starts a timer that checks the AVPlayer status

    if autoStart {
        playVideo()
    }

}

@objc func timerStatusCheck() {
// function called by a Timer and checks the status of AVPlayer 
    if player!.status == AVPlayerStatus.readyToPlay  {
        print("ready to play")
        timerStop()
        if (readyToPlayHandler != nil) {
            self.readyToPlayHandler!() // here we hide the skeleton image that shows while video is loading
        }
    } else if player!.status == AVPlayerStatus.failed {
        timerStop()
        MessageBox.showError("Video Failed to start")
    }

}

Answer 1

当AVPlayer报告速率= 1时，它正在播放视频。但是，这并不意味着视频在AVPlayerViewController中可见。为此，您需要AVPlayerViewController的属性“ isReadyForDisplay”为true。

https://developer.apple.com/documentation/avkit/avplayerviewcontroller/1615830-isreadyfordisplay

请注意，AVPlayerViewController.isReadyForDisplay和AVPlayer.status都是可观察到的KVO，比使用Timer响应性更好。

还请注意，如果您使用AVPlayerLayer来显示视频（而不是AVPlayerViewController），则出于相同的原因，您需要观察AVPlayerLayer的“ isReadyForDisplay”。

@objc func timerStatusCheck() {
// function called by a Timer and checks the status of AVPlayer 
    if player!.status == AVPlayerStatus.readyToPlay  {
        print("ready to play")

        // check that controller's view is showing video frames from player

        if playerController.isReadyForDisplay == false {
            print("view not yet showing video")
            return 
        }

        timerStop()
        if (readyToPlayHandler != nil) {
            self.readyToPlayHandler!() // here we hide the skeleton image that shows while video is loading
        }
    } else if player!.status == AVPlayerStatus.failed {
        timerStop()
        MessageBox.showError("Video Failed to start")
    }

}

AVPlayer：状态为ReadyToPlay且出现第一帧时延迟

1 个答案: