I found the solution in another thread/post here. You will see that I'm only displaying every 10th frame. This is because the frame are received so fast, that imshow(...) will display destroyed/warped images. If you supply only every 10th frame to imshow(...), the result will be okay. In case the IP camera delivers 1080p on 30fps, I had to show only every 30th or 40th frame.
#include "cv.h" #include "highgui.h" #include <iostream> int main(int, char**) { cv::VideoCapture vcap; cv::Mat image; const std::string videoStreamAddress = "rtsp://cam_address:554/live.sdp"; /* it may be an address of an mjpeg stream, e.g. "http://user:pass@cam_address:8081/cgi/mjpg/mjpg.cgi?.mjpg" */ //open the video stream and make sure it's opened if(!vcap.open(videoStreamAddress)) { std::cout << "Error opening video stream or file" << std::endl; return -1; } int counter = 0; for(;;) { counter++; if(!vcap.read(image)) { std::cout << "No frame" << std::endl; cv::waitKey(); } // if the picture is too large, imshow will display warped images, so show only every 10th frame if (counter % 10 != 0) continue; cv::imshow("Output Window", image); if(cv::waitKey(1) >= 0) break; } }
