Please also try test-launch.c @ gst-rtsp-server/test-launch.c at master · GStreamer/gst-rtsp-server · GitHub
Target
sudo apt-get install libgstrtspserver-1.0 libgstreamer1.0-dev
gcc test-launch.c -o test-launch $(pkg-config --cflags --libs gstreamer-1.0 gstreamer-rtsp-server-1.0)
./test-launch “videotestsrc ! omxh265enc ! rtph265pay name=pay0 pt=96”
Host
Open network stream rtsp://<TARGET_IP_ADDRESS>:8554/test via VLC