VideoCaptureProperties.ConvertRgb is not work

[lvzaina]

Summary of your issue

I need to read the raw data ("yuyv" format) from the uvc camera. I set ConvertRgb to 0 in emgucv and it works fine. SetCaptureProperty(Emgu.CV.CvEnum.CapProp.ConvertRgb, 0); In opencvsharp but no change Set(VideoCaptureProperties.ConvertRgb, 0);

Environment

OpenCvSharp4/4.5.1.20210210

What did you do when you faced the problem?

can't find the details of VideoCaptureProperties.ConvertRgb，It seems to be encapsulated in a library file.

Example code:

        public void OpenUSBCarmera(double width, double height, CaptureDataHandler handler, int index = 0)
        {
            Console.WriteLine("OpenUSBCarmera[" + index + "]:width:" + width + "height:" + height);
            try
            {
                if (_cameraCapture != null)
                {
                    _cameraCapture.Dispose();
                }
                _cameraCapture = returnCapture(width, height, index); 

                _dataHandler = handler;
                //_cameraCapture.FourCC = OpenCvSharp.FourCC.IYUV.ToString();
                _cameraCapture.Open(index);
                _cameraCapture.Set(VideoCaptureProperties.ConvertRgb, 0);
                _captureInProgress = true;
                Console.WriteLine("=ConvertRgb:" + _cameraCapture.Get(VideoCaptureProperties.Format));
                _frame = new Mat();

                Console.WriteLine("Fps:" + _cameraCapture.Fps);
                if (_cameraCapture != null && _cameraCapture.CvPtr != IntPtr.Zero)
                {
                    int sleepTime = (int)Math.Round(1000 / _cameraCapture.Fps);
                    Task task = new Task(() =>
                    {
                        while (_captureInProgress)
                        {
                            _cameraCapture.Read(_frame);
                            if (_frame == null || _frame.Empty())
                            {
                                return;
                            }
                            if (_dataHandler != null)
                            {
                                _dataHandler.Invoke(_frame);
                            }
                            Cv2.WaitKey(sleepTime);
                        }
                    });
                    task.Start();

                }
            }
            catch (Exception ex)
            {
                LogUtil.LogInfo(GetType(), ex.Message);
            }
        }

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