HEVC 10 Encoding

[Jademalo]

I've got a whole library of HDR movies, and I've been trying to wrap my head around the available transcoding and tonemapping options.

After poking around I've got VAAPI encoding and Vulkan accelerated shaders working, so enabling tonemapping works fine. However, now I have the problem that every transcode gets tonemapped, so no matter what I do if I'm not playing back the native video I don't get HDR.
After poking around it seems that the issue is video only ever gets transcoded to HEVC, and never HEVC 10.

HEVC 10 encoding is supported in vainfo;

Code:

VAProfileHEVCMain10            : VAEntrypointVLD
VAProfileHEVCMain10            : VAEntrypointEncSlice

However from what I can tell it seems like there's no option for Jellyfin to encode in HEVC 10, only regular HEVC.

This means that I lose HDR at lower bitrates, which is disappointing. Theoretically it should be more than possible to encode back to HEVC 10 with no tonemapping and preserve HDR at lower bitrates and resolutions, but I've not been able to find a way to do this.

Is this entirely unsupported, or is there a way to do it?

Thanks

[TheDreadPirate]

Jellyfin, currently, will always tone map when video is transcoded. Even if only to burn in subtitles. There is ongoing work to add HDR to HDR transcoding with no ETA on when that will be added to Jellyfin.

Due to the complexity of HDR, the many many kinds of HDR, and weird edge cases, HDR to HDR transcoding not as simple as you'd think.