Implementing a WebCam on a WPF App using AForge.Net

Question

Hi

I'm writing an WPF application where I need to show a Webcam feed. I was able to do this easly with the AForge framework.But when I've changed from a computer to a another computer the same code doesn't work the same way.

In the first one the webcam feed works perfectly, but in the other one this does't occur, the feed has a lot of delay, and the application doesn't work properly.

Here is the code:

    private void video_NewFrame(object sender, NewFrameEventArgs eventArgs)
    {
        Bitmap img = (Bitmap)eventArgs.Frame.Clone();

        this.Dispatcher.Invoke(System.Windows.Threading.DispatcherPriority.Render, (SendOrPostCallback)delegate
            {
                IntPtr hBitmap = img.GetHbitmap();
                System.Windows.Media.Imaging.BitmapSource bitmapSource = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(
                    hBitmap,
                    IntPtr.Zero,
                    Int32Rect.Empty,
                    System.Windows.Media.Imaging.BitmapSizeOptions.FromEmptyOptions());


                DeleteObject(hBitmap);

                img.Dispose();
                GC.Collect();




                image1.Source = bitmapSource;


            }, null);




    }

What this code is really simple, it gets a new_frame from the webcam in a form of a Bitmap, and what I need to do is to convert it to a BitmapSource, so I can show in the image frame of the WPF. I think this conversion is the responsible of the mess that is happening, but I don't understand why it works in a computer and in the other doesn't.

The computer specs are almost the same, the processor is the same, as well the system memory.

my problem here is about performance, this code in one computer runs smoothly, and the webcam feed is presented as it should, when I port it to another PC this doesn't happen

Any help will be very much appreciated.

Answer 1

In my WPF MediaKit, I have a control called VideoCaptureElement that will render a webcam to WPF. You can also get access to the samples by hooking into the new image event and setting the EnableSampleGrabbing on the element.

Answer 2

Maybe the webcam on the other computer is broken/faulty? Or has one of the webcams that doesnt support the DirectShow api, which i think AForge builds on.