Hi,
Setup
Jetson Nano with Jetson Nano Developer Kit SD Card Image
Issue
I tested nvv4l2h265enc latency measurements on Nvidia Nano and observed greater latency with file based(300ms) and less latency with live source(5ms). Can anyone please clarify why latency of nvv4l2h265enc plugin is very less(5ms) with live source and greater(500ms) with file based source ? Gstreamer Pipelines and their results are given below :
Live Source Test
GStreamer Pipeline with Live source(Raspberry Pi Version 2 camera)
gst-launch-1.0 nvarguscamerasrc ! ‘video/x-raw(memory:NVMM), width=1920, height=1080, framerate=30/1, format=NV12’ ! nvv4l2h265enc MeasureEncoderLatency=1 maxperf-enable=1 ! video/x-h265,stream-format=byte-stream ! fakesink sync=true
nvv4l2h265enc latency log file snippet with latency as 5ms
KPI: v4l2: frameNumber= 742 encoder= 5 ms pts= 25577681484
File Based Test
GStreamer Pipeline with file based source
gst-launch-1.0 filesrc location=1080p30_nv12.hevc ! h265parse ! nvv4l2decoder disable-dpb=1 enable-max-performance=1 ! nvv4l2h265enc MeasureEncoderLatency=1 maxperf-enable=1 ! fakesink sync=true
nvv4l2h265enc latency log file snippet with latency as 300ms
KPI: v4l2: frameNumber= 289 encoder= 300 ms pts= 9633333237