Variable speed lossless H265 encoding on Jetson Orin NX 16GB

Robotics & Edge Computing Jetson & Embedded Systems Jetson Orin NX
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1

Hi,
I am experimenting with H265 lossless encoding on Jetson Orin NX 16GB.

Depending on the data to be encoded, I observe large variations in encoding speed. These are the commands to reproduce this observation:

Please note, input file is stored in RAM so that disk is not to be considered.

Test 1:

  • create a YUV file where large portion of video is static:
gst-launch-1.0 videotestsrc num-buffers=100 !  'video/x-raw, width=(int)4384, height=(int)2192, format=(string)Y444'  ! filesink location=/dev/shm/static_y444_4384_2192.yuv
  • then encode with jetson_multimedia_api sample 01:
./video_encode /dev/shm/static_y444_4384_2192.yuv 4384 2192 H265 ~/Videos/static.h265 -p main --elossless -cf 3 --max-perf -hpt 1 --stats

The resulting FPS is: 47.18 FPS (best of 5 runs)

Test 2:

  • create a YUV file filled with noise:
gst-launch-1.0 videotestsrc pattern=snow num-buffers=100 !  'video/x-raw, width=(int)4384, height=(int)2192, format=(string)Y444'  ! filesink location=/dev/shm/snow_y444_4384_2192.yuv
  • then encode with jetson_multimedia_api sample 01:
./video_encode /dev/shm/snow_y444_4384_2192.yuv 4384 2192 H265 ~/Videos/snow.h265 -p main --elossless -cf 3 --max-perf -hpt 1 --stats

The resulting FPS is: 11.73 FPS (best of 5 runs)

Could you please explain why there is such a large gap between this 2 extreme cases in encoding speed?

If you have any tip for faster lossless encoding, I am open to suggestions.

3

Hi,
This looks expected in lossless encoding. The complexity of scene is in proportion to bitrate. We should also see this while recording grassland or crowd in baseball field.

5

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