ios - 尝试无缝循环 AVPlayer (userCapturedVideo) 时出现问题

Question

我一直在寻找如何正确实现这一点。我看过here和 here 。并使用了最上面的答案 here ，为了尝试实现这一点，但对我来说，录制的视频甚至没有开始循环。第一帧显示但不播放视频，因此我想知道出了什么问题。

func fileOutput(_ output: AVCaptureFileOutput, didFinishRecordingTo outputFileURL: URL, from connections: [AVCaptureConnection], error: Error?) {
    if (error != nil) {
        print("Error recording movie11: \(error!.localizedDescription)")
    } else {
        isSettingThumbnail = false

        let videoRecorded = outputURL! as URL
        playRecordedVideo(video: videoRecorded)

        if !captureSession.isRunning {
            DispatchQueue.global(qos: .background).async {
                self.startRunningCaptureSession()
            }
        }
    }
}

上述方法中使用的函数如下。

    func playRecordedVideo(video: URL) {
    thumbImage = nil
    playerQueue = AVQueuePlayer(playerItem: AVPlayerItem(url: video))

    playerLayer = AVPlayerLayer(player: playerQueue)
    playerLayer.frame = (camBaseLayer?.bounds)!
    playerLayer?.layoutIfNeeded()
    playerLayer.videoGravity = AVLayerVideoGravity.resizeAspectFill
    playerLayer.isHidden = false

    camBaseLayer?.layer.insertSublayer(playerLayer, above: previewLayer)

    playerItem1 = AVPlayerItem(url: video)

    playerLooper = AVPlayerLooper(player: playerQueue, templateItem: playerItem1)
    self.playerQueue?.play()
}

我在上面的函数中尝试了以下操作:

        var num = 0
    if num == 0 {
        self.playerQueue?.play()
        num+=1
    } else {
        NotificationCenter.default.addObserver(forName: NSNotification.Name.AVPlayerItemDidPlayToEndTime, object: self.playerQueue.currentItem, queue: nil, using: { (_) in
            DispatchQueue.main.async {
                self.playerQueue.seek(to: CMTime.zero)
                self.playerQueue.play()
            }
        })

    }

但这只会导致视频在出现时甚至无法播放。

目标是防止视频循环时出现“间隙”

更新:

好吧，实际上变量 num 应该在函数之外，这将使 NS 代码运行，但最终会像以前一样卡住 View 。

更新2:

到目前为止我还没有找到解决方案。但可以肯定的是

`            NotificationCenter.default.addObserver(forName: NSNotification.Name.AVPlayerItemDidPlayToEndTime, object: self.playerQueue.currentItem, queue: nil, using: { (_) in
                DispatchQueue.main.async {
                    self.playerQueue.seek(to: CMTime.zero)
                    self.playerQueue.play()
                }
            })

` 导致视频甚至不循环。有什么原因会发生这种情况吗？

Answer 1

几年前我使用这段代码做了同样的事情:

var player: AVPlayer!
var playerLayer: AVPlayerLayer!

private func playVideo(name: String) {
    guard let path = Bundle.main.path(forResource: name, ofType:"mp4") else { return }
    player = AVPlayer(url: NSURL(fileURLWithPath: path) as URL)
    playerLayer = AVPlayerLayer(player: player)
    self.playerLayer.frame = SOME_BOUNDS
    self.player!.play()
    NotificationCenter.default.addObserver(self, selector: #selector(playerDidFinishPlaying(note:)), name: NSNotification.Name.AVPlayerItemDidPlayToEndTime, object: player.currentItem)
}

@objc func playerDidFinishPlaying(note: NSNotification) {
    print("Video Finished")
    self.playerLayer.removeFromSuperlayer()
    playVideo(name: "SOME_NAME")
}

希望这能让您找到所需的功能