Encoding CBR h264

Autonomous Machines Jetson & Embedded Systems Jetson TX2
#1

Hello Jetson team and developers,

I am using tx2 and gstreamer to stream 1080p30 in real-time application.

I am using JetPack 28.2.1

In order to be as CBR as it can (my stream is “monitored” at 100msec intervals), I tried to configure slices parameters:

“SliceIntraRefreshEnable” set to 1 and “SliceIntraRefreshInterval” set to 5 (or 15 or 30) but both have no effect on stream bitrate over time (mainly CBR over time), I also set “IFrameInterval” to -2 (as I saw in other question in this forum) but it didn’t gave the expected result: in all of the above scenarios, the stream looks close to CBR when my camera is static, but when a movement start, there are some very big spikes of data, that I cannot tolerate in my application.

I understand from the manual, that if using “slices”, I should see the intra frame “spreads” over some multiple frames, but I couldn’t see that. Did I understood properly the “slices” functionality? And should it works well in my version and with my parameters? If not, what can I do?

thanks

#3

Hi,
You can try to

  1. Enable two pass CBR
  2. Set virtual buffer size
  3. Set stringent bitrate

Please refer to sample commands in gstreamer user guide

#4

Thanks for your reply.

I’ve tried all of your suggestions, but it seems that my stream is not CBR “enough” (if i’m looking at time intervals that are smaller than 1 sec).
I tried to use “slice” parameters, but that has small effect too.

  1. I saw, somewhere else in this forum, that one can configure infinite GOP mode (IPPPP…PP frames) - does my system support this feature? and how can I configure it?
  2. a little bit off-topic, what command/parameter should I use in order to force an IDR frame?

thanks

#5

Hi,
Please refer to the sample and give it a try:
h265 decode failed - #4 by DaneLLL

#7

the IDR frame mechanism works fine, thanks

#8

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