录制后临时目录中的 AVPlayer 视频在几秒钟后停止播放

AVPlayer video from temporary directory after recording stops playing after few seconds

我有一个自定义相机,可以录制视频和拍照。问题是在使用录制的视频预览录制并推送 viewController 后,视频会在几秒钟后停止播放。 所以流程是:

  1. Custom camera opened;
  2. I've recorded a video;
  3. Controller with recorded video preview is shown. (by pushViewController(controller, animated: true));
  4. Video started playing;
  5. After N seconds (1-2 sec) video stopped for some reason.

代码:

  1. didFinishRecordingTo outputFileURL:
        if let error = error {
            // handle error
            return
        }

        if let currentBackgroundRecordingID = backgroundRecordingID {
            backgroundRecordingID = UIBackgroundTaskIdentifier.invalid

            if currentBackgroundRecordingID != UIBackgroundTaskIdentifier.invalid {
                UIApplication.shared.endBackgroundTask(currentBackgroundRecordingID)
            }
        } 
       // open viewController and play recently recorded video from temporary files.
  1. setupVideoBackground() -> AVPlayer 的配置,在 viewDidLoad/viewWillAppear:
  2. 中调用
        let player = AVPlayer(url: url)
        player.actionAtItemEnd = .none

        let playerLayer = AVPlayerLayer(player: player)
        playerLayer.frame = self.view.frame
        playerLayer.videoGravity = .resizeAspectFill

        self.view.layer.insertSublayer(playerLayer, at: 0)

        player.seek(to: .zero)
        player.play()
  1. 推送视图控制器:
        let vc = TestController()
        vc.url = url!
        self.navigationController?.pushViewController(vc, animated: true)   

注意:一件奇怪的事情是,如果我将 pushViewController 与 animated: false 一起使用,则播放器将播放完整视频,如果与 animated: true 一起使用,则视频将在几秒钟后停止。此外,当前视图控制器工作完美。

注意 2:如果我使用 DispatchQueue 延迟 0.5 秒调用 setupVideoBackground(),视频将不会停止。

我不明白,为什么视频在 pushViewController(vc, animated: false) 之后可以正常播放,而在 pushViewController(vc, animated: true)

之后就停止播放了

解决方案一: 所以问题出在相机屏幕上的 viewDidDissapear 中。有一个cameraSession.stopSession()。每次调用 stopSession 时,avplayer 都会停止播放。我不知道 AVCaptureSession.stopSession() 为什么以及如何与 AVPlayer 相关,但是从 viewDidDissapear 中删除 cameraSession.stopSession() 解决了问题。

方案二: 您可以将 AVAudioSession 类别设置为 .playAndRecord 并且视频将正确播放:

try AVAudioSession.sharedInstance().setCategory(.playAndRecord, mode: .videoRecording, options: [.mixWithOthers])