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CODE:---------------------------------------------------------------

int main(){

CvCapture *camera=cvCreateFileCapture("rtsp://192.168.1.108:554/cam/realmonitor?channel=1&subtype=0&unicast=true&proto=Onvif");
if (camera==NULL)
    printf("camera is null\n");
else
    printf("camera is not null");

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);
cvDestroyWindow("img");

}

error :-------------------------------------------------------------

camera is not null[h264 @ 01c62240] Invalid level prefix [h264 @ 01c62240] error while decoding MB 49 23 [h264 @ 01c62240] Invalid level prefix [h264 @ 01c62240] error while decoding MB 34 33 [h264 @ 01c62240] Invalid level prefix [h264 @ 01c62240] error while decoding MB 14 33 [h264 @ 01c62240] out of range intra chroma pred mode at 17 35 [h264 @ 01c62240] error while decoding MB 17 35 [h264 @ 01dc5020] Invalid level prefix [h264 @ 01dc5020] error while decoding MB 54 34