I'm unable to find any mention of CRF in the NvEnc documentation and the Nvidia developer forum. There are quite a few speculations to be found online, in relation with ffmpeg (as in "doesn't seem to be supported"), but nothing really definite nor up-to-date. Can anybody shed some light on this? In case it really isn't supported, is there a technical reason or will it be added in the future?
Thanks!
crf (constant rate factor) is a video quality setting that only exists in x264 and x265. It is not part of the HEVC standard, so don't expect to find it in any other HEVC encoder.