Is crf rate mode implemented in vc8000e vpu?

[gawarren]

I'm using the unit test, vc8000e_hevcenc, provided with the imx-vpu-hantro-vc package, and one of the command line options is --crf. Nothing is happening when I change this value. I am able to adjust the quality with --quanHdr; however, I want to use --crf 0 to guarantee lossless encoding

[Bio_TICFSL · Accepted solution]

Hello gawarren,

--crf[n] -1..51 Constant rate factor mode, working with look-ahead turned on. -1=disable. [-1]
CRF mode is to keep a certain level of quality based on crf value, working as constant QP with complexity rate control.
CRF adjusts frame level QP within range of crf constant +-3 based on frame complexity. CRF will disable VBR mode if both enabled.

--crf is indeed not be used. Advice customer to use q[n] --qpHdr -1..51, Initial target QP.

Regards