record audio with GPUImage create black frames at the beginning

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I'm trying to record and save a video using GPUCamera framework in Swift.

    videoCamera = GPUImageVideoCamera(sessionPreset: AVCaptureSessionPreset1280x720, cameraPosition: .Back)
    videoCamera.outputImageOrientation = .LandscapeRight;
    videoCamera.horizontallyMirrorFrontFacingCamera = true
    videoCamera.addTarget(filter)
    videoCamera.startCameraCapture()

    movieWriter = GPUImageMovieWriter(movieURL: output, size: view.frame.size)
    videoCamera.audioEncodingTarget = movieWriter!
    filter?.addTarget(movieWriter!)

I set audioEncodingTarget to true to record audio too. In this way the output video contain a black frame at the beginning. How can I resolve this problem? thanks.

asked 3 mins ago

marcobonny88

58

record audio with GPUImage create black frames at the beginning