Hi,
You may eliminate the network factor first. Please try the command on Jetson Nano:
$ gst-launch-1.0 uridecodebin uri='rtsp://127.0.0.1:8554/test' ! nvoverlaysink
Not sure if the port it 8554. Please change the RTSP URI accordingly.
And can try hardware encoder nvv4l2h264enc. And can try UDP streaming like:
Gstreamer TCPserversink 2-3 seconds latency - #5 by DaneLLL