RTSP stream doesn't work in remote mode with port forwarding on router

C++
,
7

Hi dear community! Any help would be really appreciated, i still can’t find solution. I try to use standalone gstreamer with the following command:
gst-launch-1.0 -v playbin uri=rtsp://admin:8888@xxx.xx.xx.xxx:1987/rtsp_live1 uridecodebin0::source::latency=300
and it works good with port forwarded video stream, but if i try the same command in opencv it doesn’t work:
cv::VideoCapture source("rtsp://admin:8888@xxx.xx.xx.xxx:1987/rtsp_live1 uridecodebin0::source::latency=300", cv::CAP_GSTREAMER);

also tried this way:

cv::VideoCapture source("rtsp://admin:8888@xxx.xx.xx.xxx:1987/rtsp_live1", cv::CAP_GSTREAMER);

do not pay attention on the previous screenshot with opencv configuration, i rebuild the opencv using cmake with gstreamer support and my current version of openCV support gstreamer.

Thank you very much