How to specify the Mastering Display Data from a tool such as mediainfo

[Brainiarc7]

Hello there,

I have a file with the following mediainfo, as shown below:

R: x=0.680000 y=0.320000, G: x=0.265000 y=0.690000, B: x=0.150000 y=0.060000, White point: x=0.312700 y=0.329000

How do I convert this into the format string as specified in the readme, i.e G(13250,34500)B(7500,3000)R(34000,16000)WP(15635,16450)L(10000000,1)?

[drSHLEFF]

Dont need to convert. Your file has a standard Display Mastering P3 HDR mediainfo, so "R: x=0.680000 y=0.320000, G: x=0.265000 y=0.690000, B: x=0.150000 y=0.060000, White point: x=0.312700 y=0.329000" IS EQUAL TO "G(13250,34500)B(7500,3000)R(34000,16000)WP(15635,16450)L(10000000,1)"

Unfortunately this program does not work properly... IMHO)

[Brainiarc7]

How do you do the math that results in the result? Is there a formula for that?

[drSHLEFF]

Yes --master-display SMPTE ST 2086 mastering display color volume SEI info, specified as a string which is parsed when the stream header SEI are emitted. The string format is “G(%hu,%hu)B(%hu,%hu)R(%hu,%hu)WP(%hu,%hu)L(%u,%u)” where %hu are unsigned 16bit integers and %u are unsigned 32bit integers. The SEI includes X,Y display primaries for RGB channels and white point (WP) in units of 0.00002 and max,min luminance (L) values in units of 0.0001 candela per meter square. Applicable for HDR content.

Example for a P3D65 1000-nits monitor, where G(x=0.265, y=0.690), B(x=0.150, y=0.060), R(x=0.680, y=0.320), WP(x=0.3127, y=0.3290), L(max=1000, min=0.0001):

G(13250,34500)B(7500,3000)R(34000,16000)WP(15635,16450)L(10000000,1) Note that this string value will need to be escaped or quoted to protect against shell expansion on many platforms. No default.

--max-cll Maximum content light level (MaxCLL) and maximum frame average light level (MaxFALL) as required by the Consumer Electronics Association 861.3 specification.

Specified as a string which is parsed when the stream header SEI are emitted. The string format is “%hu,%hu” where %hu are unsigned 16bit integers. The first value is the max content light level (or 0 if no maximum is indicated), the second value is the maximum picture average light level (or 0). Applicable for HDR content.

Example for MaxCLL=1000 candela per square meter, MaxFALL=400 candela per square meter:

–max-cll ?1000,400? Note that this string value will need to be escaped or quoted to protect against shell expansion on many platforms. No default.

http://x265.readthedocs.io/en/default/cli.html

[Brainiarc7]

By any chance, is there a Linux equivalent to this utility?

It'd be awesome if NVENC had support for HDR out of the box.

[Selur]

On Linux you could simply use the python script,..

[drSHLEFF]

Yes, very simple) Don't know, I don't like Linux, and use it only on my home media server...

[pwacooijmans]

Dear nvhsp coder, could you PLEASE help out this guy getting the master-display settings correct for nvencc? This is the link to the site: https://github.com/rigaya/NVEnc/issues/51 The coder of NVEnc has NEARLY finished the complete implementation of everything that was listed in nvhsp as options. However the master display keeps being a problem for him, could you PLEASE help him out by giving some hints on how to do it?

[drSHLEFF]

DCI-P3: --master-display G(13250,34500)B(7500,3000)R(34000,16000)WP(15635,16450)L(10000000,1) --max-cll 1000,1 RGB: G(x=0.265, y=0.690), B(x=0.150, y=0.060), R(x=0.680, y=0.320), WP(x=0.3127, y=0.329), L(max=1000, min=0.0000)

Rec.709: --master-display G(15000,30000)B(7500,3000)R(32000,16500)WP(15635,16450)L(10000000,1) --max-cll 1000,1 RGB: G(x=0.30, y=0.60), B(x=0.150, y=0.060), R(x=0.640, y=0.330), WP(x=0.3127,y=0.329), L(max=1000, min=0.0000)

Rec.2020: --master-display G(8500,39850)B(6550,2300)R(35400,14600)WP(15635,16450)L(10000000,1) --max-cll 1000,1 RGB: G(x=0.170, y=0.797), B(x=0.131, y=0.046), R(x=0.708, y=0.292), WP(x=0.3127,y=0.329), L(max=1000, min=0.0000)

To convert, simply divide the RGB values by 0.00002 Sample for "Display P3": 0.265 / 0.00002 = 13250 0.69 / 0.00002 = 34500 0.15 / 0.00002 = 7500 0.06 / 0.00002 = 3000 0.68 / 0.00002 = 34000 0.32 / 0.00002 = 16000 0.3127 / 0.00002 = 15635 0.329 / 0.00002 = 16450

Information: https://en.wikipedia.org/wiki/DCI-P3 https://en.wikipedia.org/wiki/Rec._709 https://en.wikipedia.org/wiki/Rec._2020

https://www.smpte.org/sites/default/files/section-files/HDR.pdf

[tazlord]

Hello there,

I have a file with the following mediainfo, as shown below:

R: x=0.680000 y=0.320000, G: x=0.265000 y=0.690000, B: x=0.150000 y=0.060000, White point: x=0.312700 y=0.329000

How do I convert this into the format string as specified in the readme, i.e G(13250,34500)B(7500,3000)R(34000,16000)WP(15635,16450)L(10000000,1)?

How do you get that data from Mediainfo?

[pwacooijmans]

x50000 and x10000

Op wo 29 jan. 2020 06:01 schreef David Sanchez [email protected]:

Hello there,

I have a file with the following mediainfo, as shown below:

R: x=0.680000 y=0.320000, G: x=0.265000 y=0.690000, B: x=0.150000 y=0.060000, White point: x=0.312700 y=0.329000

How do I convert this into the format string as specified in the readme, i.e G(13250,34500)B(7500,3000)R(34000,16000)WP(15635,16450)L(10000000,1)?

How do you get that data from Mediainfo?

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