#ifdef _OPENCV21

#include <cv.h>

#include <highgui.h>

#else

#include <opencv2/core/core_c.h>

#include <opencv2/imgproc/imgproc_c.h>

#include <opencv2/highgui/highgui_c.h>

#endif

#include <stdio.h>

int main(int argc, char* argv[])

{

        IplImage  *frame;

        CvCapture *capture;

        CvSize  size;

        capture = cvCaptureFromCAM(0);

        cvSetCaptureProperty(capture,CV_CAP_PROP_FPS, 15);  

        cvSetCaptureProperty(capture,CV_CAP_PROP_FRAME_WIDTH,640);

        cvSetCaptureProperty(capture,CV_CAP_PROP_FRAME_HEIGHT,480 );

    frame = cvQueryFrame(capture);

    cvShowImage("correct frame 640*480",frame);

        size = cvGetSize(frame);

        printf("width: %d, height: %d\n", size.width, size.height);

        cvSetCaptureProperty(capture,CV_CAP_PROP_FPS, 15);  

        cvSetCaptureProperty(capture,CV_CAP_PROP_FRAME_WIDTH,320);

        cvSetCaptureProperty(capture,CV_CAP_PROP_FRAME_HEIGHT,240 );

    frame = cvQueryFrame(capture);

    cvShowImage("correct frame 320*240",frame);

        size = cvGetSize(frame);

        printf("width: %d, height: %d\n", size.width, size.height);

        cvSetCaptureProperty(capture,CV_CAP_PROP_FRAME_WIDTH,320);

        cvSetCaptureProperty(capture,CV_CAP_PROP_FRAME_HEIGHT,240 );

         cvSetCaptureProperty(capture,CV_CAP_PROP_FPS, 15);  

    frame = cvQueryFrame(capture);

        size = cvGetSize(frame);

        printf("width: %d, height: %d\n", size.width, size.height);

        cvShowImage("fault: frame 640*480",frame);

    cvWaitKey(0);

    cvReleaseCapture(&capture);

}