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Old Yesterday, 12:03   #1  |  Link
Jamaika
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How the sample range and HDR functions should be set?

I have doubts about the new VVC codecs. Should the default sample range limited be entered for HDR HLG?
HDR HLG is 300-1000 cd/m2 isn't the same as range limited 100 cd/m2 or full for 10000 cd/m2. Should the codec disable sample range for HDR?

Last edited by Jamaika; Yesterday at 12:05.
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Old Today, 06:03   #2  |  Link
FranceBB
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I think that it should actually offer the option to include all the metadata that x265 already offers.
The thing is that HLG doesn't have to be 1000 nits; it can be up to 1000 nits but there's nothing stopping you from mastering at let's say 400 nits.
As a matter of fact I did it for a documentary where I had mixed contents (archive footages and new interviews) in order not to show much difference between the old archive SDR footages and the new HDR interviews.
And... yes, you can argue that in official HLG streams there's no metadata whatsoever other than --colorprim bt2020 --transfer arib-std-b67 --colormatrix bt2020nc --atc-sei 18 so no master display or max-cll and the decoder (a TV) has to guess the values and it generally does it by finding the brightest pixel in the frame and adjusting accordingly. Some other TVs instead assume that it's going to peak at 1000 nits anyway since it's HLG (even if it doesn't) and they decode it accordingly, which is one of the reason why some people prefer to bump everything up to 1000 nits and master it that way even if the camera doesn't have enough stops.


In a nutshell: I do think that the option should be kept for HLG as well; it's not mandatory but if people insert it, the hope is that the decoder will read it and scale accordingly rather than just ignoring it.
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