About "control-rate" of omxh264enc and nvv4l2h264enc

Autonomous Machines Jetson & Embedded Systems Jetson TX2
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1

I’m currently using JetsonTX2/R32.2.1/Jetpack 4.2.2.

I found a issue that “control-rate” does not work properly when I execute the following GStreamer command.

gst-launch-1.0 nvarguscamerasrc timeout=10 !
‘video/x-raw(memory:NVMM), width=(int)1920, height=(int)1080,
format=(string)NV12, framerate=(fraction)30/1’ ! nvvidconv !
‘video/x-raw(memory:NVMM), format=(string)I420’ ! nvv4l2h264enc control-rate=1 bitrate=262144 ! h264parse ! qtmux ! filesink location=test.mp4 -e

At this time, if you darken or brighten the room
The size of test.mp4 changes a lot.

Does anyone know why the amount of data cannot be fixed?
This has the same issue with omxh264enc.
And the NVIDIA development kit also has this issue.

Also, since I have already made a product using R32.2.1,
It’s difficult to use the new Jetpack from now on.

I would like to use R32.2.1 to solve this issue.

3

Hi,
You may apply this patch and try again:
How to use H.264/5 control-rate with GStreamer? - #7 by DaneLLL

The source code of gst-v4l2 is in
https://developer.nvidia.com/embedded/dlc/r32-2-1_Release_v1.0/TX2-AGX/sources/public_sources.tbz2

4

Thank you for your reply.

I have tried your patch
The issue did not improve.

Does this patch also apply to omxh264enc?
Both omxh264enc and nvv4l2h264enc did not improve the issue.

5

Hi,
Please refer to this post and configure vbv-size:
Random blockiness in the picture RTSP server-client -Jetson TX2 - #5 by DaneLLL

6

Thank you for your reply.

Please refer to this post and configure vbv-size :

bitrate=512kbps(512*1024=524288)
FPS:30

gst-launch-1.0 nvarguscamerasrc timeout=10 !
‘video/x-raw(memory:NVMM), width=(int)1920, height=(int)1080,
format=(string)NV12, framerate=(fraction)30/1’ ! nvvidconv !
‘video/x-raw(memory:NVMM), format=(string)I420’ ! nvv4l2h264enc ratecontrol-enable=1 control-rate=1 bitrate=524288 vbv-size=20000 ! h264parse ! qtmux ! filesink location=test.mp4 -e

I set vbv-size but it didn’t fix the issue.
The file size changes greatly depending on whether the room is bright or dark.

7

Hi,
It looks similar to
Constant Bitrate help - #12 by DaneLLL
500kbps is too harsh for 1080p30. Hardware encoder cannot encode insuch low nitrate when scene changes or scene is complicated. Suggest set bitrate to a larger value.

1 Like
8

Hi DaneLLL

500kbps is too harsh for 1080p30.
Hardware encoder cannot encode insuch low nitrate when scene changes or scene is complicated. Suggest set bitrate to a larger value.

Thank you for your support.
I understand that it is a problem of the bit rate and image size used.