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Old 3rd December 2017, 02:07   #1  |  Link
shag00
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Join Date: May 2014
Posts: 11
How to check if a BD is really HDR

OK, I have my first 4K BD labelled HDR so I disassembled it and was looking at it with Media Tab to determine what some of the technical differences are between non HDR and HDR video, as compared to my existing library.

The first one was that the new video is 10 bit instead of 8 bit but further investigation has led me to believe that you can have 4k, non HDR video at 10 bit also.

Further comparison discovered that my HDR video has these attributes that appear to denote that it is HDR:
1/ Chroma subsampling : 4:2:0 (Type 2)
2/ Color range : Limited
3/ Color primaries : BT.2020
4/ Matrix coefficients : BT.2020 non-constant
5/ Mastering display luminance : min: 0.0050 cd/m2, max: 4000.0000 cd/m2
6/ Maximum Content Light Level : 500 cd/m2
7/ Maximum Frame-Average Light : 200 cd/m2

Does anyone have the technical expertise to confirm that these attributes mean the video is HDR? Also, do these attributes give any indication if WCG is enabled in the video?
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Old 3rd December 2017, 07:59   #2  |  Link
Asmodian
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Your 1 - 3 do not indicate HDR. 4:2:0 and limited range are standard for everything back to DVDs. Video with BT.2020 color primaries is usually HDR, but not always.

4 being non-constant and the presence of 5 - 7 all indicate it is encoded as HDR video. 5 - 7 is the "HDR metadata" you may have seen discussed.

Edit: I got confused on this point again.
BT.2020 non-constant would also be used for SDR BT.2020, it is BT.2020 constant that would most likely be HDR. I believe most HDR material out today is BT.2020 non-constant anyway. The constant or non-constant refers to linear or gamma like transfer functions, constant is linear.
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Last edited by Asmodian; 8th December 2017 at 09:56.
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