Issue with Logitech BRIO at high resolution

[Contianer]

Hi,
I have a problem when I try to capture high resolution images with this webcam (https://www.logitech.com/en-gb/product/brio?crid=1690)
I use the following code (C#):

Code: Select all

            FilterInfoCollection videosources = new FilterInfoCollection(FilterCategory.VideoInputDevice);

            if (videosources != null)
            {
                videoSource = new VideoCaptureDevice(videosources[1].MonikerString);

                try
                {
                    if (videoSource.VideoCapabilities.Length > 0)
                    {
                        string highestSolution = "0;0";
                        for (int i = 0; i < videoSource.VideoCapabilities.Length; i++)
                        {
                            if (videoSource.VideoCapabilities[i].FrameSize.Width > Convert.ToInt32(highestSolution.Split(';')[0]))
                                highestSolution = videoSource.VideoCapabilities[i].FrameSize.Width.ToString() + ";" + i.ToString();
                        }
                        videoSource.VideoResolution = videoSource.VideoCapabilities[Convert.ToInt32(highestSolution.Split(';')[1])];

                       

                    }
                } catch (Exception ex) { Console.WriteLine(ex.StackTrace); }

                videoSource.NewFrame += new AForge.Video.NewFrameEventHandler(videoSource_NewFrame);

                videoSource.Start();
            }

and

Code: Select all

void videoSource_NewFrame(object sender, AForge.Video.NewFrameEventArgs eventArgs)
        {
            pictureBoxVideo.Image = (Bitmap)eventArgs.Frame.Clone();
        }


It works fine for resolutions up to 800x448. (LED on the webcam is on and i see a picture in my application).
For resolutions above (e.g. 800x600) the LED is off and i dont get a picture.

Any help is appreciated. Greetings from Germany.

[andrew.kirillov]

Hello,

Hard to say for sure without debugging (which requires such device). I can only assume that a DirectShow (API used to access USB/internal cameras) capture graph fails to initialize. Maybe higher resolutions of the camera provide pictures in other than 24bpp format. And so capture graph does not agree with configuration. Just a guess.

[Contianer]

Hello,

thanks for your response. Shouldn´t that throw an exception? I don´t get anything like that, the "new frame"-handler is just never called.

[andrew.kirillov]

Hello,

Shouldn´t that throw an exception?

Ideally it should do something - either work fine or throw exception explaining what went wrong. However, as you can see, things are going wrong. You can try debugging with AForge.NET source code and see could be causing the issue.