Ultra low latency on encoding and decoding

You have enabled all factors for low latency. The profiling result looks fine and expected. For further enhancement, you may execute sudo jetson_clcoks to fix CPU cores at maximum clock, and enable VIC engine at maximum clock:
Nvvideoconvert issue, nvvideoconvert in DS4 is better than Ds5? - #3 by DaneLLL

Since hardware encoder and decoder need certain time for encoding and decoding, it may not be possible to achieve zero latency. Please note this and expect certain latency from encoder and encoder.