External rate control with AV1 wayyyy off

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

Dear NVIDIA

today i tried the external rate control feature of the jetson multimedia API video encoder

we tried to compress a single image of size 640x512 into an AV1 I frame with the following parameters

nTargetFrameBits = 60000
nFrameMaxQP = 255
nFrameMinQP = 0
nFrameQP = 128
nMaxQPDeviation = 255

nSessionMaxQP = 255

the resulting frame was of size 949040, wayyy bigger than what we wanted, and the report metadata says that the minimum qp is 251 and the maximum is 1, which is totally wrong as the max should be bigger than the min

any idea on why it happend?

3

Hi,
Please share a way to replicate it by running 01_video_encode. So that we can check what may not be wrong in the condition.

One question, in AV1 encoding, maximum qp value is 255? In h264/h265, it ranges in 0 - 50. Would like to know if this is different in AV1 spec.

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