OpenCV webcam capture problem

Question

I've installed OpenCV 2.2 and now I can't get webcam capture to work. It worked ok in 2.1. OpenCV detects a webcam, doesn't report any errors or warnings, but each frame is a gray image. I even tried a code sample from OpenCV wiki:

VideoCapture cap(0); // open the default camera
if(!cap.isOpened())  // check if we succeeded
    return -1;

Mat edges;
namedWindow("edges",1);
for(;;)
{
    Mat frame;
    cap >> frame; // get a new frame from camera
    cvtColor(frame, edges, CV_BGR2GRAY);
    //GaussianBlur(edges, edges, Size(7,7), 1.5, 1.5);
    //Canny(edges, edges, 0, 30, 3);
    imshow("edges", edges);
    if(waitKey(30) >= 0) break;
}
// the camera will be deinitialized automatically in VideoCapture destructor
return 0;

Did anyone run into this issue? I'm using 64bit Win7 and Visual Studio 2010.

Answer 1

I found the solution after a very long search.

The problem is that if doesn't have a delay between showing the frames happen this problem.

The solution is put cvWaitKey(20); in loop.