观看视频时录制带音频的视频

Posted 2023-02-25

【中文标题】观看视频时录制带音频的视频

【英文标题】：Record video with audio when watching video

【发布时间】：2018-05-22 09:55:57

【问题描述】：

当用户同时观看视频时，我正在尝试从前置摄像头录制视频。如果没有音频输入，源代码就像一个魅力，但是当我激活音频输入时，视频不会开始播放。这是可能的还是我正在努力实现不可能的事情？

记录视频源代码

override func viewWillAppear(_ animated: Bool) 
        super.viewWillAppear(animated)

        self.session.beginConfiguration()
        self.session.sessionPreset = AVCaptureSessionPresetMedium

        // Add video input.
        do 
            guard let videoDevice = AVCaptureDevice.defaultDevice(withDeviceType: .builtInWideAngleCamera, mediaType: AVMediaTypeVideo, position: .front) else fatalError()
            let videoDeviceInput = try AVCaptureDeviceInput(device: videoDevice)

            if self.session.canAddInput(videoDeviceInput) 
                self.session.addInput(videoDeviceInput)
             else 
                print("Could not add video device input to the session")
                self.session.commitConfiguration()
                return
            
         catch 
            print("Could not create video device input: \(error)")
            self.session.commitConfiguration()
            return
        

        // Add audio input.
        do 
            guard let audioDevice = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeAudio) else fatalError()
            let audioDeviceInput = try AVCaptureDeviceInput(device: audioDevice)

            if self.session.canAddInput(audioDeviceInput) 
                self.session.addInput(audioDeviceInput)
            
            else 
                print("Could not add audio device input to the session")
            
         catch 
            print("Could not create audio device input: \(error)")
        

        self.videoPreviewLayer = AVCaptureVideoPreviewLayer(session: self.session)
        self.videoPreviewLayer!.videoGravity = AVLayerVideoGravityResizeAspect
        self.videoPreviewLayer!.connection?.videoOrientation = AVCaptureVideoOrientation.portrait
        self.cameraElement.layer.addSublayer(self.videoPreviewLayer!)
        self.session.commitConfiguration()
        self.session.startRunning()


func startRecording() 
    let recordingDelegate: AVCaptureFileOutputRecordingDelegate? = self
    self.videoFileOutput = AVCaptureMovieFileOutput()
    self.session.addOutput(videoFileOutput)

    let filePath = NSURL(fileURLWithPath: NSTemporaryDirectory()).appendingPathComponent("tmpVideo.mov")
    ContentController.tmpFilePath = filePath
    videoFileOutput?.startRecording(toOutputFileURL: filePath, recordingDelegate: recordingDelegate)

播放视频源代码

override func viewDidAppear(_ animated: Bool) 
    super.viewDidAppear(animated)

    player = AVPlayer(url: ContentController.content!.url!)
    let playerLayer: AVPlayerLayer = AVPlayerLayer(player: player)
    playerLayer.frame = self.videoElement.bounds
    self.videoElement.layer.addSublayer(playerLayer)

    player?.currentItem!.addObserver(self, forKeyPath: "status", options: NSKeyValueObservingOptions(), context: nil)

【问题讨论】：

这听起来很吓人。这是什么类型的应用程序？

@kthorat 将成为一个革命性的应用程序。 ;-) 就像视频分享聊天一样。类似于 Skype，但没有流式传输视频。我要收藏

太棒了！请注意用户的隐私，并通知用户有关录制和其他活动的信息。祝你好运。

@kthorat 不用担心。一切都会合法

【参考方案1】：

问题在于线程处理。

我的解决办法是：

func playerReadyToPlay() 
    DispatchQueue.global(qos: .userInitiated).async 
        self.player?.play()
    
    super.startRecording()