Nvv4l2decoder/nvv4l2h264enc with gst-rtsp-server latency increasement

Hi,
For comparison, you may try

  1. execute sudo nvpmodel -m 0 and sudo jetson_clocks
  2. UDP:
    Gstreamer TCPserversink 2-3 seconds latency - #5 by DaneLLL
  3. try IDR interval = 15 or 30
  4. use videotestsrc in the test-launch command

The latency may be from the rtspsrc, This should be identified by comparing with videotestsrc. Besides, RTSP may have higher latency than UDP.