ios - AVCaptureSession 和 AVAudioSession 在背景音乐播放时录制视频只能工作一次

Question

看完这个问题:AVAudioSession AVAudioSessionCategoryPlayAndRecord glitch ，我试着尝试让背景音乐正常播放的视频录制。我正在解决录制开始和结束时的音频故障，并且第一次录制时它工作正常。但是如果我再次尝试录音，音乐就会停止。

有什么想法吗？

这是我的代码片段:

    captureSession = AVCaptureSession()
    captureSession?.automaticallyConfiguresApplicationAudioSession = false
    captureSession?.usesApplicationAudioSession = true

    guard let captureSession = self.captureSession else {
        print("Error making capture session")
        return;
    }

    captureSession.sessionPreset = AVCaptureSessionPresetHigh

    self.camera = self.defaultBackCamera()
    self.audioDeviceInput = try? AVCaptureDeviceInput(device: getAudioDevice())

    cameraInput = try AVCaptureDeviceInput(device: camera)
    captureSession.beginConfiguration()
    if captureSession.inputs.count > 0 {
        return
    }
    if captureSession.canAddInput(cameraInput) {
        captureSession.addInput(cameraInput)
        if captureSession.outputs.count == 0 {
            photoOutput = AVCapturePhotoOutput()
            if captureSession.canAddOutput(photoOutput!) {
                captureSession.addOutput(self.photoOutput!)
            }
    }
    captureSession.commitConfiguration()
    if !captureSession.isRunning {
        captureSession.startRunning()
        self.previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
        self.previewLayer!.videoGravity = AVLayerVideoGravityResizeAspect
        self.previewLayer!.connection.videoOrientation = .portrait
        self.previewLayer!.frame = cameraView.layer.bounds
        self.cameraView.layer.addSublayer(self.previewLayer!)
        captureSession.beginConfiguration()
        videoFileOut = AVCaptureMovieFileOutput()
        if (captureSession.canAddOutput(videoFileOut)) {
            captureSession.addOutput(videoFileOut)
            if (videoFileOut?.connection(withMediaType: AVMediaTypeVideo).isVideoStabilizationSupported)! {
                videoFileOut?.connection(withMediaType: AVMediaTypeVideo).preferredVideoStabilizationMode = .cinematic
            }
        }
        captureSession.commitConfiguration()
    }

这是开始记录的代码:

    let audioSession = AVAudioSession.sharedInstance()
    try! audioSession.setCategory(AVAudioSessionCategoryPlayAndRecord,
                                                    with: [.mixWithOthers, .allowBluetoothA2DP, .allowAirPlay])
    try! audioSession.setActive(true)
    captureSession?.beginConfiguration()
    if (captureSession?.canAddInput(audioDeviceInput!))! {
        captureSession?.addInput(audioDeviceInput!)
    }
    captureSession?.commitConfiguration()

并停止录制:

    let audioSession = AVAudioSession.sharedInstance()
    try! audioSession.setCategory(AVAudioSessionCategoryAmbient, with: [.mixWithOthers, .allowAirPlay])

    captureSession?.beginConfiguration()
    captureSession?.removeInput(audioDeviceInput)
    captureSession?.commitConfiguration()

Answer 1

我正在做一个项目，我必须做几乎相同的事情:录制带有背景音频播放的视频。 (在 Xamarin 中)

在我的代码中，我在 onViewLoad 中设置了 AudioSession。

在将类别设置为 PlayAndRecord 之前，我还执行 audioSession.SetActive(false)。也许您应该在开始/停止录制时尝试这样做。

贝诺特