Can't get RTSP stream with openCV 4.5.2

C++
1

Hi, i am trying to get rtsp stream with OpenCV and cant do it.

I am using the stream like this: rtsp://admin:123456@xx.xx.x.xxx:7070 and VLC player open up and play the life video stream perfect.

And i am trying to show the stream in OpenCV window, but the frame is empty everytime:

cv::VideoCapture source("rtsp://admin:123456@xx.xx.x.xxx:7070");
 while (cv::waitKey(1) < 1)
    {
        source >> frame;
        if (frame.empty())
        {
            cv::waitKey();
            break;
        }
         cv::namedWindow("output");
        cv::imshow("output", frame); 
    }

My camera: ACTI d64, here is a web site: D64 | ACTi Corporation

Also i try to get an http mjpeg stream, but result is the same (frame is empty), i can run this script in Firefox browser and can see a life videostream: http://xx.xx.x.xxx/cgi-bin/encoder?USER=Admin&PWD=123456&GET_STREAM

Please help me to get it work with OpenCV VideoCapture class