Hi,
We have derecated omx plugins. Please use nvv4l2h265enc plugin. This post has sample commands:
Gstreamer TCPserversink 2-3 seconds latency - #5 by DaneLLL
Deocoding begins from first IDR frame, so the h265 streams are dropped before receiving first IDR frame. If you don’t want to drop too many packets, please set idrinterval to small value.