processing Video frames

edit

Hi there i've been playing a little bit discovering openCv on VS12, everything works fine for me concerning image processing. But i have a problem for processing video: i'm following basic tutorials, but when i compile, i only get one single frame through the video input. Where could this come from? I think i have a problem handling my frame, but i've been stricly following tutorials, this is what i write:

void main() { //example from a book

cv::VideoCapture capture(0);

if (!capture.isOpened())

    std::cout<<"not opened" <<std::endl;

// Get the frame rate

double rate= capture.get(CV_CAP_PROP_FPS);

bool stop(false);

cv::Mat frame; // current video frame

cv::namedWindow("Extracted Frame");

// Delay between each frame in ms // corresponds to video frame rate

int delay= 1000/rate;

// for all frames in video

while (!stop) {

// read next frame if any

    if (!capture.read(frame))
        break;

    cv::imshow("Extracted Frame",frame);

// introduce a delay // or press key to stop

    if (cv::waitKey(delay)>=0)
        stop= true;

} // Close the video file. // Not required since called by destructor capture.release(); }

//another version i personnaly wrote void main (void){ bool stop; stop = false; cv::VideoCapture capture (0); //capture from the webcam

if(capture.isOpened() == false ){
    std::cout<< "Capture Error" <<std::endl;
}//test if opned

cv::Mat frame;
cv::namedWindow("w");

double rate= capture.get(CV_CAP_PROP_FPS);


while (stop == false){
    frame=capture.read();
    if (!capture.read(frame))
        break;


    if (cvWaitKey() ){
        stop = true;
    }

    cv::imshow("w",frame);

}// chose while
capture.release();
cvDestroyWindow("w");

}

everytime i get the same thing: One single image from the cam does appear, and then i can push any key to stop, but i dont get a video frame