ios 录制视频并同时播放音频

我想同时录制视频和播放音频。当开始录制视频时，预加载的音频开始播放，当停止视频录制时，音频也停止播放。

我尝试使用第三方库录制视频“迅捷相机" (https://github.com/Awalz/SwiftyCam https://github.com/Awalz/SwiftyCam）并在开始写入视频录制文件时在委托方法中开始播放音频。

主要 ViewCOntroller 代码如下：

override func viewDidAppear(_ animated: Bool) {
 super.viewDidAppear(animated)
 var temp = Data()
 let audioPath = Bundle.main.path(forResource: "ab1-FAST", ofType: "mp3")
        temp = FileManager.default.contents(atPath: (audioPath)!)!
     do {
            player = try  AVAudioPlayer(data: temp)
        }
        catch let error {

            print(error)
        }

        self.configureAudioSession()
        player!.delegate = self
        self.player!.prepareToPlay()
}

    // MARK: -
    // MARK: - SwiftyCamViewControllerDelegate method

func swiftyCam(_ swiftyCam: SwiftyCamViewController, didBeginRecordingVideo camera: SwiftyCamViewController.CameraSelection) {
  self.player?.play()
}

func swiftyCam(_ swiftyCam: SwiftyCamViewController, didFinishRecordingVideo camera: SwiftyCamViewController.CameraSelection) 
{
        if self.player != nil{
            if (self.player?.isPlaying)! {
                self.player?.stop()
            }
        }
}


@IBAction func btnStartStopClick(_ sender: UIButton) {

        sender.isSelected = !sender.isSelected
        if sender.isSelected{

            DispatchQueue.main.async {
                self.objVideoRecorderVC.startVideoRecording()
            }
        }else{
             self.objVideoRecorderVC.stopVideoRecording()

        }
  }

swiftycam 库：

/**

    Begin recording video of current session

    SwiftyCamViewControllerDelegate function SwiftyCamDidBeginRecordingVideo() will be called

    */
public func startVideoRecording() {
        guard let movieFileOutput = self.movieFileOutput else {
            return
        }

        if currentCamera == .rear && flashEnabled == true {
            enableFlash()
        }

        if currentCamera == .front && flashEnabled == true {
            flashView = UIView(frame: view.frame)
            flashView?.backgroundColor = UIColor.white
            flashView?.alpha = 0.85
            previewLayer.addSubview(flashView!)
        }

        sessionQueue.async { [unowned self] in
            if !movieFileOutput.isRecording {
                if UIDevice.current.isMultitaskingSupported {
                    self.backgroundRecordingID = UIApplication.shared.beginBackgroundTask(expirationHandler: nil)
                }

                // Update the orientation on the movie file output video connection before starting recording.
                let movieFileOutputConnection = self.movieFileOutput?.connection(withMediaType: AVMediaTypeVideo)


                //flip video output if front facing camera is selected
                if self.currentCamera == .front {
                    movieFileOutputConnection?.isVideoMirrored = true
                }

                movieFileOutputConnection?.videoOrientation = self.getVideoOrientation()

                // Start recording to a temporary file.
                let outputFileName = UUID().uuidString
                let outputFilePath = (NSTemporaryDirectory() as NSString).appendingPathComponent((outputFileName as NSString).appendingPathExtension("mov")!)


                movieFileOutput.startRecording(toOutputFileURL: URL(fileURLWithPath: outputFilePath), recordingDelegate: self)
                self.isVideoRecording = true
    DispatchQueue.main.async {
                    self.cameraDelegate?.swiftyCam(self, didBeginRecordingVideo: self.currentCamera)
                }
            }
            else {
                movieFileOutput.stopRecording()
            }
        }
    }

问题：有时开始播放音频会延迟一微秒。 当音频开始播放并在视频录制中录制声音时，有时会正确同步，有时会出现声音延迟。

I check it with merge audio with original audio and there is some delay as shown below image. the issue is not always but random delay and not sync.

are any solutions? how to do record video and play audio at the same time(on single button click) start and no delay and no sync issue? is any other way?

用于播放音频使用：AVAudioPlayer

用于录制视频：Swiftycam (AVCaptureSession)

您可以尝试以下几件事：

1）在后台队列中播放音频：

dispatch_async(dispatch_get_global_queue(QOS_CLASS_BACKGROUN‌​D, 0)) {
    self.player.play()
}

2）移动您的代码viewDidAppear（包括prepareToPlay()) to viewDidLoad。我认为这将是一个不太有用的建议，因为播放是用户发起的，但之间存在延迟prepareToPlay()当你的音频准备好时。

如果您尝试这些并且延迟仍然太多，您可能不得不使用除AVAudioPlayer， 例如OpenAL.