Improve gstreamer pipeline

Just a few things to try:

  • Increase recv socket max buffer size:
sysctl -w net.core.rmem_max=26214400
  • Turn Denver cores off (see this topic)

  • Replace nvv4l2decoder by h265parse ! omxh265dec:

gst-launch-1.0 rtspsrc location="..." latency=300 ! application/x-rtp,encoding-name="H265",payload=96 ! rtph265depay ! video/x-h265, stream-format=byte-stream,framerate=25/1 ! h265parse ! omxh265dec ! nvoverlaysink sync=false
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