录制时为我的视频添加音频 - Swift 4

Question

我正在尝试在录制视频时添加音频。我知道我必须单独录制并在保存文件时合并它们，但我无法弄清楚语法或在哪里添加我的音频设备以及在哪里合并文件。

大部分可用信息基于旧的已弃用语法或仅涉及一个主题（视频、音频等）

我有不同的功能来准备会话、显示会话和记录会话以及保存看起来像这段代码的输出文件，该代码基于 "Zero2Launch" https://www.youtube.com/watch?v=7TqXrMnfJy8

但我这辈子都不知道如何处理音频。

func setupCaptureSession() {
    captureSession.sessionPreset = AVCaptureSession.Preset.hd1920x1080
}

func setupDevice() {
    let deviceDiscoverySession = AVCaptureDevice.DiscoverySession(deviceTypes: [AVCaptureDevice.DeviceType.builtInWideAngleCamera], mediaType: AVMediaType.video, position: AVCaptureDevice.Position.unspecified)

    let devices = deviceDiscoverySession.devices

    for device in devices {
        if device.position == AVCaptureDevice.Position.back {
            backCamera = device
        } else if device.position == AVCaptureDevice.Position.front {
            frontCamera = device
        }
    }
    currentDevice = backCamera
}


func setupInputOutput() {
    do {
        let captureDeviceInput = try AVCaptureDeviceInput(device: currentDevice!)
        captureSession.addInput(captureDeviceInput)
        videoFileOutput = AVCaptureMovieFileOutput()
        captureSession.addOutput(videoFileOutput!)
    } catch {
        print(error)
    }
}

func setupPreviewLayer() {
    cameraPreviewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
    cameraPreviewLayer?.videoGravity = AVLayerVideoGravity.resizeAspectFill
    cameraPreviewLayer?.connection?.videoOrientation = AVCaptureVideoOrientation.portrait
    cameraPreviewLayer?.frame = self.view.frame
    self.view.layer.insertSublayer(cameraPreviewLayer!, at: 0)
}

func startRunningCaptureSession() {
    captureSession.startRunning()
}

func recordVideo() {

    if !isRecording {
        isRecording = true

        UIView.animate(withDuration: 0.5, delay: 0.0, options: [.repeat, .autoreverse, .allowUserInteraction], animations: { () -> Void in
            self.recordButton.transform = CGAffineTransform(scaleX: 0.5, y: 0.5)
        }, completion: nil)

        let outputPath = NSTemporaryDirectory() + "output.mov"
        let outputFileURL = URL(fileURLWithPath: outputPath)
        videoFileOutput?.startRecording(to: outputFileURL, recordingDelegate: self)

    } else {
        isRecording = false

        UIView.animate(withDuration: 0.5, delay: 1.0, options: [], animations: { () -> Void in
            self.recordButton.transform = CGAffineTransform(scaleX: 1.0, y: 1.0)
        }, completion: nil)
        recordButton.layer.removeAllAnimations()
        videoFileOutput?.stopRecording()
    }
}

func fileOutput(_ output: AVCaptureFileOutput, didFinishRecordingTo outputFileURL: URL, from connections: [AVCaptureConnection], error: Error?) {
    if error != nil {
        print(error)
        return
    }

    UISaveVideoAtPathToSavedPhotosAlbum(outputFileURL.relativePath, self, nil, nil)
}

Answer 1

您不需要单独保存音频并合并它们。您只需将 audioDeviceInput 添加到您的会话输入，AVCaptureMovieFileOutput 将为您完成一切。尝试更改 setupInputOutput 方法

func setupInputOutput() {
    guard let audioDevice = AVCaptureDevice.default(for: .audio) else { return }

    do {
        let captureDeviceInput = try AVCaptureDeviceInput(device: currentDevice!)
        let audioDeviceInput = try AVCaptureDeviceInput(device: audioDevice)

        captureSession.addInput(captureDeviceInput)
        captureSession.addInput(audioDeviceInput)

        videoFileOutput = AVCaptureMovieFileOutput()
        captureSession.addOutput(videoFileOutput!)
    } catch {
        print(error)
    }
}

还有第二种方法可以使用 AVCaptureVideoDataOutput、AVCaptureAudioDataOutput 和 AVAssetWriter 类来录制视频和音频，但有点复杂。如果您不需要实时更改视频或音频缓冲区，最好使用 AVCaptureMovieFileOutput

录制时为我的视频添加音频 - Swift 4

Add audio to my video when recording - Swift 4

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