OpenCV C++ Video Capture does not seem to work

Question

I am using a Mac OS X 10.6 machine. I have OpenCV 2.1 x64 compiled from source using Xcode and its GCC compiler.

I am having trouble using the C++ video reading feat

Answer 1

Try simplifying the program so that you can identify the exact location of the problem, e.g. change your loop so that it looks like this:

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);
    imshow("edges", frame);
    if(waitKey(200) >= 0) break;
}

If that works OK then try adding the processing calls back in, one at a time, e.g

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(200) >= 0) break;
}

and so on...

Once you've identified the problematic line you can then focus on that and investigate further.