Missing bitrate documentation for nvv4l2h264enc

Autonomous Machines Jetson & Embedded Systems Jetson AGX Xavier
1

Hello!

I’m currently working in an AGX Xavier, and I’m trying to develop a method for adaptive bitrate in a video pipeline. First, I checked the element nvv4l2h264enc for encoding, using the next command:

gst-inspect-1.0 nvv4l2h264enc

And checked the bitrate property of the element that says the following:

bitrate : Set bitrate for v4l2 encode
flags: readable, writable, changeable only in NULL or READY state
Unsigned Integer. Range: 0 - 4294967295 Default: 4000000

First, I was worried since it says in can only be changed in NULL or READY state, but I tested it with the GstD Tool from RidgeRun. With this tool, I was able to make changes to the bitrate property in PLAYING state and it worked. So I wanted to share about this missing information in the documentation of the nvv4l2h264enc element.

Thank you!

Edson Murillo,
Embedded SW Engineer at RidgeRun
Contact us: support@ridgerun.com
Developers wiki: https://developer.ridgerun.com/
Website: www.ridgerun.com

3

Hi,
You are correct. Bitrate can be changed in runtime. We will check this and fix the description.

6

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