Question

我正在开发一个使用swift的应用程序，可以在一段精确的时间内录制视频。在这个例子中，这是7秒。所有工作对于第一个记录都很好，但是连续记录不包含音频而只包含视频。我读了一些关于更改AVCaptureMovieFileOutput实例的movieFragmentInterval的内容，我尝试但没有任何改变。

 func setup(){
    self.session = AVCaptureSession()
    self.session.sessionPreset = AVCaptureSessionPresetHigh

    // INPUT
    var devices : Array<AVCaptureDevice> = AVCaptureDevice.devices() as Array<AVCaptureDevice>
    var camera:AVCaptureDevice!
    var microphone:AVCaptureDevice!

    for device in devices{
        println("Device name: \(device)")
        if device.hasTorch && device.isTorchModeSupported(AVCaptureTorchMode.On){
            self.torch = device
        }
        if device.hasMediaType(AVMediaTypeAudio){
            microphone = device
        }
        if device.hasMediaType(AVMediaTypeVideo){
            if device.position == .Back{
                println("Device position: back.")
                camera = device
            }   }   }

    var error:NSErrorPointer = nil
    // audio
    if (microphone != nil){
        var audioInput = AVCaptureDeviceInput(device: microphone, error: error)
        if error == nil{
            //  if !error{
            if self.session.canAddInput(audioInput){
                self.session.addInput(audioInput)
            }   }   }
    // video input
    if (camera != nil){
        var VideoInput = AVCaptureDeviceInput(device: camera, error: error)
        //  if !error{
        if error == nil{
            if self.session.canAddInput(VideoInput){
                self.session.addInput(VideoInput)
            }   }   }


    self.output = AVCaptureMovieFileOutput()
    var preferredTimeScale:Int32 = 30   
    var totalSeconds:Int64 = Int64(Int(7) * Int(preferredTimeScale)) // after 7 sec video recording stop automatically
    var maxDuration:CMTime = CMTimeMake(totalSeconds, preferredTimeScale) 
    self.output.maxRecordedDuration = maxDuration

    self.output.minFreeDiskSpaceLimit = 1024 * 1024 

    if session.canAddOutput(self.output){
        session.addOutput(self.output)
    }

    self.connection = self.output.connectionWithMediaType(AVMediaTypeVideo)
    if self.connection.supportsVideoStabilization == true{
        println("video stabilization avaible")
        self.connection.enablesVideoStabilizationWhenAvailable = true
    }
    self.connection.videoOrientation = .LandscapeRight

    self.session.startRunning()
}

func startRecording(){
    self.output.startRecordingToOutputFileURL(self.tempPathURL, recordingDelegate: self)
}

func stopRecording(){
    self.output.stopRecording()
}

func captureOutput(captureOutput: AVCaptureFileOutput!, didFinishRecordingToOutputFileAtURL outputFileURL: NSURL!, fromConnections connections: [AnyObject]!, error: NSError!){
    println("Finish recording")
    var success:Bool = false
    if error != 0 && error != nil{
        println("error")
        let value: AnyObject? = error.userInfo?[AVErrorRecordingSuccessfullyFinishedKey]
        if value == nil{
            success = true
        }else{
            success = false
        }
    }
    if success == true{
        stopRecording()
    }
}

AVCaptureMovieFileOutput仅为第一个视频录制音频

0 个答案: