OpenCV et stream (RTSP - RTMP)

CvCapture *camera=cvCaptureFromFile("rtsp://IP:Port/streamXY");
cvNamedWindow("img");
    while (cvWaitKey(10)!=atoi("q")){
        double t1=(double)cvGetTickCount();
        IplImage *img=cvQueryFrame(camera);
        double t2=(double)cvGetTickCount();
        printf("time: %gms  fps: %.2g\n",(t2-t1)/(cvGetTickFrequency()*1000.), 1000./((t2-t1)/(cvGetTickFrequency()*1000.)));
        cvShowImage("img",img);
    }
    cvReleaseCapture(&camera);

CvCapture *camera=cvCaptureFromFile("rtmp://IP:Port/streamXY");

int main(){

    CvCapture *camera=cvCaptureFromFile("http://demo1.stardotcams.com/nph-mjpeg.cgi?.mjpg"); // vous pouvez tester aussi avec "http://195.5.21.185/axis-cgi/mjpg/video.cgi?.mjpg" (adresses publiques)
   
	if (camera==NULL)
        printf("camera is null\n");
    else
        printf("camera is not null");

    // Create a window in which the captured images will be presented
	cvNamedWindow("img", CV_WINDOW_AUTOSIZE);
    while (cvWaitKey(10)!=atoi("q")){
        double t1=(double)cvGetTickCount();
        IplImage *img=cvQueryFrame(camera);
        double t2=(double)cvGetTickCount();
        printf("time: %gms  fps: %.2g\n",(t2-t1)/(cvGetTickFrequency()*1000.), 1000./((t2-t1)/(cvGetTickFrequency()*1000.)));
        cvShowImage("img",img);
    }
    cvReleaseCapture(&camera);
	cvDestroyWindow( "img" );
   return 0;
}