ScreenToGif.Webcam.DirectX.CaptureWebcam.DerenderGraph C# (CSharp) Method

        protected void DerenderGraph()
        {
            // Stop the graph if it is running (ignore errors)
            if (MediaControl != null)
                MediaControl.Stop();

            // Free the preview window (ignore errors)
            if (VideoWindow != null)
            {
                VideoWindow.put_Visible(CoreStreaming.DsHlp.OAFALSE);
                VideoWindow.put_Owner(IntPtr.Zero);
                VideoWindow = null;
            }

            // Remove the Resize event handler
            if (PreviewWindow != null)
                PreviewWindow.SizeChanged -= new SizeChangedEventHandler(OnPreviewWindowResize);

            if ((int)ActualGraphState >= (int)GraphState.Rendered)
            {
                // Update the state
                ActualGraphState = GraphState.Created;
                IsPreviewRendered = false;

                // Disconnect all filters downstream of the 
                // video and audio devices. If we have a compressor
                // then disconnect it, but don't remove it
                if (VideoDeviceFilter != null)
                    RemoveDownstream(VideoDeviceFilter, (VideoCompressor == null));
            }
        }