error in capturing video by DirectX.Capture Class Library

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C#

DirectX

memory

I want to write a chat program that capturing video. I found a project from code project with DirectX.Capture Class Library title for capturing part.It works correctly but when i stoped capturing and want to start capturing again there is an error:
Insufficient system resources exist to complete the requested service.
I searched this error,as i understand it relates to memory leak.
Should i clear memory?
Does my program harm because of clearing memory?
my code:

Filters fl = new Filters();
Capture capture;
private void btnCaptureFilm_Click(object sender, EventArgs e)
        {
            capture = new Capture(fl.VideoInputDevices[0], fl.AudioInputDevices[0]);
            capture.Filename = D:\\MyVide-anyany.avi;
            capture.PreviewWindow = pbFilm;
            capture.Start();
            btnCaptureFilm.Enabled = false;
        }

        private void btnStopCapture_Click(object sender, EventArgs e)
        {
            capture.Stop();
            btnCaptureFilm.Enabled = true;
            this.Close();

        }