With beta release of server version 1.41.0.8911 there are now options to set the tonemapping algorithm for HDR->SDR transcoding. [Screen Shot 2024-08-22 at 11.03.02 AM] I am not very familiar with these different options so went looking across some discussion groups and there are a lot of opinion…

The support articles have been updated with basic descriptions of the algorithms; we are working on finding HDR content we can legally use to generate screenshots to show the various differences. We had users asking to change the algorithm to hable, and knew there would be others who prefered mobiu…

Thanks for the reference links. Will be interesting to see the differences between the algorithms. FWIW, the earlier versions of Plex use mobius.

[image] FordGuy61: FWIW, the earlier versions of Plex use mobius. That’s good to know! I was curious.

I have been so exited for this release since HW transcoding was introduced in the preview build, PlexMediaServer-1.40.6.8747, which worked flawlessly for me. No matter what I threw at it it would hw transcode. Unfortunately after installing this latest beta, hw transcoding is no longer and defaultin…

[image] PoppinJ: Also, I don’t see the options to select a tone mapping algorithm so I’m not sure what platforms this is for. Mine is screenshot from my QNAP … maybe Windows platform doesn’t support it? Saw this support document which looks like that’s the case if you’re not using nvidia. Ma…

Yeah, it just beta so Maybe they havn’t fully worked HDR tone mapping into windows yet. I was excited based on this release note. (Tonemapping) Added support for HW Tonemapping on Windows for some Intel devices (PM-532) I dont know how to look up more info on this. Like I said this version, …

Tonemapping algorithm isn’t the root issue with my comment. We have, for a few processors (GeminiLake and CoffeeLake Refresh specifically), where we’re playing “whack-a-mole” with Intel’s drivers. Fix one – break something else. It’s getting better but a REAL P.I.T.A :roll_eyes:

Okay… so I got some references but not ideal testing. Using Plex Desktop on Mac this is the HDR reference: [HDR1-HDR] Here is transcoding using Hable via Plex Web (Firefox): [HDR1-Hable] Here is Mobius: [HDR1-Mobius] Here is Reinhard: [HDR1-Reinhard] Another reference using Plex Desktop…

Just to clarify, with this new Beta version HW transcoding works with 1080 content, and 4k SDR content. HDR HW transcoding is failing and falling back to CPU, where it worked on the preview build.

The language added in the support article is a bit hard to understand unless you’re already familiar with these things. I’m minimally familiar and I have no idea what “Fit a logarithmic transfer between the tone curves” means so having those examples would probably provide the most help for us regul…

Tonemapping Algorithm Question

Plex Media Server

Insomnic_1 August 22, 2024, 6:33pm 7

Maybe related to this comment about some issues with a couple intel chips? I just happened to come across that one while digging around the forums about tonemapping before posting this topic.

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Missing Tone Mapping Algorithm Option Plex Media Server server-windows	3	283	May 26, 2025
[Plex Media Server] Forum Preview for Tonemapping on Windows with Intel iGPUs Plex Media Server server-windows , feature-preview	230	16212	July 23, 2024
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Tonemapping Algorithm Question

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