There is another discussion on Magic Lantern forums, some users tried DVR as way to generate x265's parameters, either static or dynamic, but on their monitors dynamic hdr10+ was not really different ...
====
« Reply #16 on: April 27, 2022, 01:15:21 PM »
Btw, did you ever get to actually see the effect of your HDR10+ metadata on your display? 
I prepared 4 versions of the same clip, namely
- PQ10, i.e. PQ transfer characteristics and BT.2020 color space (no metadata at all!)
- HDR10, namely (1) + static HDR10 metadata (mastering display color primaries + min and max luminance + MaxCLL + MaxFALL)
- HDR10+ Profile A, namely (2) + dynamic metadata consisting of luminance distribution parameters
- HDR10+ Profile B, namely (3) + dynamic metadata consisting of Bezier curve parameters
The clip included some very bright scenes, some more balanced scenes, as well as some very dark scenes with a few bright spots.
To
assess the four versions of the clip, I photographed the TV screen from
a long distance in a dark room, of course taking Raw pictures and
baking them with exactly the same (somewhat neutral) settings in ACR.
The results:
- version
1 is slightly darker in all cases (this somewhat surprised me as I
expected on the contrary that no metadata could lead to oversaturated /
clipped highlights)
- versions 3 and 4 look apparently identical
(no surprise), but they seem to roll highlights (as well as shadows)
slightly differently from 2, in a non-trivial way (in most, but not all
cases, increasing contrast slightly)
So yes, in the end I could
find some differences with my TV -- but very subtle, in many cases
visible more by comparing the sample pictures histogram rather than
really perceivable with the naked eye.
Sergio
==== end of quote ====
Still, I guess having those python functions cloned locally might be good idea!
Also, note they used hdr metadata output in DVR, this is reason why I looked into mpv's incomplete (in this regard) HDR support ...
Also note they used hdr10+ capable TV so, even if you do not have monitor, may be going to friend with BIIIG TV will help in some ways!