How to set the max bitrate for video encoder in MMAPI?

Robotics & Edge Computing Jetson & Embedded Systems Jetson TX2
1

I think the max bitrate of video encoder is very common, but in MMAPI, i cannot find it.

How to set the max bitrate for video encoder? And by default, what is the max bitrate?

Thanks!

2

Please refer to max capability of each encoder listed in [Software Features] → [Video Encoders]
https://developer.nvidia.com/embedded/dlc/l4t-documentation-27-1

3

Thank you for the replys!

I think you misunderstood my question. I want to kown how to set the max bitrate of video encoding in MMAPI, not the max capability of encoder.

4

Please share more information about max bitrate of video encoding. Looks like we don’t have implementation for this.

5

Yes, I cannot find this api for NvVideoEncoder in MMAPI.

For example, In ffmpeg, the “-maxrate” param is the max bitrate of video encoding.

./ffmpeg -i 1.mp4 -vcodec h264 -acodec aac -b:a 96k -b:v 1000k -maxrate 3000k 2.mp4

6

Hi zcs, we don’t have the implementation. You probably can achieve similar functionality by setting

-MinQpI               Specify minimum Qp Value for I frame

-MaxQpI               Specify maximum Qp Value for I frame

-MinQpP               Specify minimum Qp Value for P frame

-MaxQpP               Specify maximum Qp Value for P frame

-MinQpB               Specify minimum Qp Value for B frame

-MaxQpB               Specify maximum Qp Value for B frame

But it is still different from -maxrate in ffmpeg.

7

Yes, there is a big difference between them.

In our application, we must know and set exactly max bitrate.

Do NVIDIA have any plans to implement it?

8

For now we don’t have plan. Do you have idea how ffmpeg implements ‘-maxrate’? Does it ensure each frame does not exceed 3000k bits?

9

As far as I know, it is the basic function of the video encoder.

It donot ensure each frame, but the duration of VBR.