Is there a way to constrain the QP range for I, P and B with CBR ratecontrol mode? I set the following parameters in the encoder: ctx->ratecontrol = V4L2_MPEG_VIDEO_BITRATE_MODE_CBR; ctx->nMaxQpI = ctx->nMaxQpP = ctx->nMaxQpB = 51; ctx->nMinQpI = ctx->nMinQpP = ctx->nMinQpB=40; I can see actu…

Hi, There is no document for the advancing function. Please refer to the user’s example and give it a try. And check the source code.

Cbr ratecontrol and QP ranges

DaneLLL January 10, 2025, 8:11am 8

Hi,
You may try external rate control to set the parameters frame by frame. Please refer to
H265 bitstream size is too large when using external rate control

And check codes about populate_ext_rate_ctrl_Param() in 01_video_encode.

Constant bitrate when using ROI (Nvv4l2h265enc)

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