I think it has to do with the fact that you are encoding with H264/H265 and using the quality control profile in TVAI.
With NVEnc, the equivalent to CRF is ‘rc=vbr’ with ‘cq’, ‘qmin’ and ‘qmax’ set (I don’t think Topaz uses that approach, shame), which produces an actual Constant Quality / CRF in one pass, but with a variable bit rate, and thus without the downside of wasting disk space like ‘rc=constqp’ (what Topaz is using).
I know, to much technical…don’t bother with it…
Simply try encoding with FFV1 and see if it alters with your Frame rate as well or not. if it doesn’t then, you know it is the hevc_nvenc command and not something else. and that could easily be fixed in the CLI until Topaz will actually change their encoding command…
No, I don’t think that is it. I’ve only used ProRes since TVAI added it. In fact I had to look around for the screen of your screenshot. I did find it. (Prefs-Export). I didn’t find it overly technical, I appreciate your note. Perhaps a Topaz person can confirm they are aware/looking into it.
I just did an export using FFV1, and had the same results.
There’s no problem with VBR, it’s a good thing. But VFR is a very bad thing. Hopefully it’s an oversight, but the only Topaz tech who responded was only talking about VBR, which was not part of the issue.
