Hybrid Log-Gamma (HLG) Support for HDR Live Streams?

savmikeonthemic

New Member
HLG Chart and Photo Example_OBS Forums.png

Is it possible to add HLG (Hybrid Log-Gamma) support to OBS for HDR live streams? I know it might seem excessive right now, but I have a feeling HDR live streams will be needed for a good variety of users as live streaming becomes more readily adopted. A couple of other reasons stood out to me as to why HLG should be considered:
  • There is no extra metadata required to properly view the image, making it backwards compatible with the SDR (Standard Dynamic Range) displays most people have
  • It is royalty free, meaning no costly license fees are required to implement it
I also know that it's part of the ATSC 3.0 (aka NextGen TV, as it's called in the U.S.) standard that many TV stations will be implementing into their live broadcasts in the upcoming years, and many manufacturers and software developers have already or will be adopting HLG into their products. If anyone is interested, I've attached links to PDF's that go over the specifications of HLG below:

BT.2100 : Image parameter values for high dynamic range television for use in production and international programme exchange (Courtesy of International Telecommunication Union)

A "Display Independent" High Dynamic Range Television System (Courtesy of BBC)

ATSC Standard: Video – HEVC (A/341) (Courtesy of Advanced Television Systems Committee)
 

tcamps

New Member
Given that OBS doesn't support HDR at all, this seems like a reasonable shim to provide at least *some* sort of recording when HDR is enabled.

I'm not sure what the processing overhead would look like but at least this might work with (relatively) little changes elsewhere in the pipeline since the recorded content is still all SDR.

Full HDR support would be great, but in the meantime, this should seriously be considered.
 

LunaWolfe

New Member
Do you guys know if recent OBS updates have been modified to support HDR? I can't seem to find that setting in the software settings
 
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