ios - GPUImage 视频录制

Question

我一直在尝试创建使用 GPUImage 库来录制来自相机的视频，对其进行过滤并保存到相机胶卷。

GPUImageMovieWriter 给我带来了一些问题。这是我的代码:

    //Set up the GPUImageVideoCamera
    videoCamera = GPUImageVideoCamera(sessionPreset: AVCaptureSessionPreset640x480, cameraPosition: .Back)
    videoCamera.outputImageOrientation = .Portrait;
    videoCamera.horizontallyMirrorFrontFacingCamera = true
    videoCamera.horizontallyMirrorRearFacingCamera = false

    //Create filter with view
    filter = GPUImageFilter()
    filterView = GPUImageView(frame: self.view.frame)
    filterView.fillMode = kGPUImageFillModePreserveAspectRatioAndFill;
    self.view.addSubview(filterView)

    pathToMovie = NSHomeDirectory().stringByAppendingPathComponent("stream.mp4")
    unlink((pathToMovie as NSString).UTF8String)
    var movieURL = NSURL.fileURLWithPath(pathToMovie)
    movieWriter = GPUImageMovieWriter(movieURL: movieURL, size: CGSizeMake(640, 480))
    movieWriter.encodingLiveVideo = true

    //Attach targets
    videoCamera.addTarget(filter)
    filter.addTarget(filterView)
    filter.addTarget(movieWriter)

    //Start capture
    videoCamera.startCameraCapture()
    movieWriter.startRecording()

应用程序崩溃并显示以下调试器输出(调用 startRecording() 方法时):

[AVAssetWriter startWriting] Cannot call method when status is 3

关于为什么会发生这种情况的任何线索？为什么 AVAssetWriter 的状态是.Failed？

请注意，所有变量都是我的类的属性。

Answer 1

同样的错误。似乎 movieURL 构建错误。将代码更改为时已修复

movieURL = NSURL.fileURLWithPath(NSHomeDirectory())
                .URLByAppendingPathComponent("stream.mp4")!
unlink(movieURL.path!)