I'm trying to record video using the GPUImage library. The recorded clip ends with a black frame. I know that is caused by audioEncodingTarget that is a very expensive operation. This has been discussed a lot, but i still don't find a solution. Here is my code:
GPUCameraRecorder class init
videoCamera = GPUImageVideoCamera(sessionPreset: AVCaptureSessionPresetiFrame960x540, cameraPosition: .Back)
videoCamera.outputImageOrientation = .LandscapeRight;
videoCamera.horizontallyMirrorFrontFacingCamera = true
filter = GPUImageFilter()
videoCamera.addTarget(filter)
view = GPUImageView(frame: frame)
view.fillMode = kGPUImageFillModePreserveAspectRatioAndFill
movieWriter = GPUImageMovieWriter(movieURL: output, size: view.frame.size)
movieWriter?.encodingLiveVideo = true
filter?.addTarget(movieWriter!)
filter?.addTarget(view as GPUImageView)
videoCamera.audioEncodingTarget = self.movieWriter!
videoCamera.startCameraCapture()
start recording function
func startRecording(){
println("Start recording.")
recording = true
dispatch_async(dispatch_get_main_queue()) {
var res = self.videoCamera.addAudioInputsAndOutputs()
println(res)
self.movieWriter!.startRecording()
}
}
end recording function
func stopRecording(){
println("Recording end.")
dispatch_async(dispatch_get_main_queue()) {
self.filter?.removeTarget(self.movieWriter!)
self.videoCamera.audioEncodingTarget = nil
self.movieWriter!.finishRecording()
self.putTorchOff()
self.delegate?.recordingEnd()
println("completed")
}
}
Any suggestion? Someone have find a way to make it work without black frames?
Did you try this ?
Inside GPUImageMovieWriter.m add code:
static BOOL allowWriteAudio = NO;
- (void)startRecording;
{
...
allowWriteAudio = NO;
}
- (void)processAudioBuffer:(CMSampleBufferRef)audioBuffer;
{
if (!allowWriteAudio) {
return;
}
...
}
- (void)newFrameReadyAtTime:(CMTime)frameTime atIndex:(NSInteger)textureIndex;
{
...
if (![assetWriterPixelBufferInput appendPixelBuffer:pixel_buffer withPresentationTime:frameTime])
NSLog(@"Problem appending pixel buffer at time: %@", CFBridgingRelease(CMTimeCopyDescription(kCFAllocatorDefault, frameTime)));
allowWriteAudio = YES; //< add this
...
}