HDR10+ General Discussion - Page 3

buratino · 22nd January 2019, 19:58

hi,

i create json data in DaVinci Resolve for my hdr video.
How to implement the JSON data in the video?

benwaggoner · 22nd January 2019, 22:42

--dhdr10-info <foo>.json

buratino · 23rd January 2019, 00:38

Quote:

Originally Posted by benwaggoner

--dhdr10-info <foo>.json

sorry...
I just started to study this topic. what utility should i use?

benwaggoner · 23rd January 2019, 01:01

Quote:

Originally Posted by buratino

sorry...
I just started to study this topic. what utility should i use?

That's the syntax for x265.exe. That will inject the JSON into the SEI messages while encoding the video.

mini-moose · 25th January 2019, 23:55

Quote:

Originally Posted by benwaggoner

That's the syntax for x265.exe. That will inject the JSON into the SEI messages while encoding the video.

Do you have definite opinion if this should be used with --dhdr10-opt or not?

mariner · 26th January 2019, 08:04

Quote:

Originally Posted by quietvoid

Hi, since HDR10+ titles started coming out I've been working on extracting the metadata from them.
For now the only purpose is to generate JSON files that x265 can use when reencoding these sources.

So I've made a tool which does just that, extracts the metadata and creates a compatible JSON file for x265.
It outputs a .log file with the raw bytes of every SEI message as well as a .json file with metadata formatted for HDR10+ LLC (not legacy).
HDR10+ LLC is what most current titles have been formatted like for now.

The tool is available on GitHub here: https://github.com/quietvoid/hdr10plus_parser
HDR10+ samples are available in the assets folder, they're also used for regression tests.

Hopefully this is useful for anyone wanting to retain HDR10+ after reencode as well as developers who have ideas about reusing the metadata on decode

Thank you, quietvoid.

Selur · 3rd February 2019, 16:58

okay so far we can:

verify whether a HEVC file contains HDR-10+ dynamic data (using hdr10plus_parser)
extract existing HDR-10+ dynamic data from a file (using hdr10plus_parser + ffmpeg, in case the video isn't available as raw video)
convert to HDR-10+ using x265 and the corresponding dynamic data

tested the above and they all seem to work fine.

Next question is: How to playback such content on a pc?

Cu Selur

Ps.: Thanks to quietvoid for hdr10plus_parser. Really useful!

nevcairiel · 3rd February 2019, 17:41

I'm working on making the HDR10+ metadata available to a renderer when decoding with LAV Video, so eg. madVR could then make use of it. madshi has already expressed interest in making use of it. A timeframe for that is however not available.

Selur · 3rd February 2019, 18:57

@nevcairiel: Thanks for the info. Happy to hear someone is working on it.

jlpsvk · 4th February 2019, 09:31

Another question. Can we crop video, while encoding with HDR10+ metadata?

nevcairiel · 4th February 2019, 10:58

The HDR10+ metadata references areas of the video, so if you scale or crop it (ie. change its size in any way), you would need to update the metadata accordingly.

quietvoid · 4th February 2019, 13:03

I'm thinking it's all mostly based on luminance.
There's info about every luminance percentile for a frame and a value associated to it.
However I'm not sure what these values refer to, nor what Average Max RGB is about either.

jlpsvk · 4th February 2019, 13:43

anyone know, how to update those metadata for cropped encode?

mini-moose · 4th February 2019, 17:59

Quote:

Originally Posted by Selur

[*]extract existing HDR-10+ dynamic data from a file (using hdr10plus_parser + ffmpeg, in case the video isn't available as raw video)

How is it done with ffmpeg? Example would be much appreciated!

Selur · 4th February 2019, 20:08

to output the data:

Code:

ffmpeg -i "E:\Output\HDR-10+.mp4" -vcodec copy -an -sn -vbsf hevc_mp4toannexb -f rawvideo - | hdr10plus_parser.exe -

just to check whether dynamic data is present

Code:

ffmpeg -i "E:\Output\HDR-10+.mp4" -vcodec copy -an -sn -vbsf hevc_mp4toannexb -f rawvideo - | hdr10plus_parser.exe - --verify

benwaggoner · 5th February 2019, 00:54

Quote:

Originally Posted by jlpsvk

anyone know, how to update those metadata for cropped encode?

If you cropped out any image data, it would need to be recalculated.

jlpsvk · 5th February 2019, 10:23

Quote:

Originally Posted by benwaggoner

If you cropped out any image data, it would need to be recalculated.

seems like a bad idea to crop and resize then.

would stick with uncropped.

benwaggoner · 5th February 2019, 13:05

Quote:

Originally Posted by jlpsvk

seems like a bad idea to crop and resize then.

would stick with uncropped.

Resizing is a low-pass filter, and can reduce peak brightness significantly if it is from small details like stars.

nevcairiel · 5th February 2019, 13:18

Cropping alone wouldn't change the primary image information (assuming you only crop black bars). However, the metadata also references spatial windows in the image, which would get displaced if you crop, so those would at the very least need to be re-positioned.
Without proper tool support to do all of this, I would not bother trying to crop yet.

jlpsvk · 5th February 2019, 13:45

yeah.

i was meaning cropping, not resizing.

so hdr10+ encodes without cropping for now.

22nd January 2019, 22:42	#42 \| Link
benwaggoner Moderator Join Date: Jan 2006 Location: Portland, OR Posts: 4,770	--dhdr10-info <foo>.json __________________ Ben Waggoner Principal Video Specialist, Amazon Prime Video My Compression Book

3rd February 2019, 16:58	#47 \| Link
Selur Registered User Join Date: Oct 2001 Location: Germany Posts: 7,277	okay so far we can: verify whether a HEVC file contains HDR-10+ dynamic data (using hdr10plus_parser) extract existing HDR-10+ dynamic data from a file (using hdr10plus_parser + ffmpeg, in case the video isn't available as raw video) convert to HDR-10+ using x265 and the corresponding dynamic data tested the above and they all seem to work fine. Next question is: How to playback such content on a pc? Cu Selur Ps.: Thanks to quietvoid for hdr10plus_parser. Really useful! __________________ Hybrid here in the forum, homepage

3rd February 2019, 17:41	#48 \| Link
nevcairiel Registered Developer Join Date: Mar 2010 Location: Hamburg/Germany Posts: 10,346	I'm working on making the HDR10+ metadata available to a renderer when decoding with LAV Video, so eg. madVR could then make use of it. madshi has already expressed interest in making use of it. A timeframe for that is however not available. __________________ LAV Filters - open source ffmpeg based media splitter and decoders

3rd February 2019, 18:57	#49 \| Link
Selur Registered User Join Date: Oct 2001 Location: Germany Posts: 7,277	@nevcairiel: Thanks for the info. Happy to hear someone is working on it. __________________ Hybrid here in the forum, homepage

4th February 2019, 09:31	#50 \| Link
jlpsvk Registered User Join Date: Dec 2014 Posts: 240	Another question. Can we crop video, while encoding with HDR10+ metadata? __________________ AMD Ryzen 9 5950X, 32GB DDR4-3200 CL16, RTX 3060, 2TB NVMe PCIE4.0, NAS with 8x16TB HDD

22nd January 2019, 19:58	#41 \| Link
buratino Registered User Join Date: Jan 2019 Posts: 2	hi, i create json data in DaVinci Resolve for my hdr video. How to implement the JSON data in the video?

4th February 2019, 10:58	#51 \| Link
nevcairiel Registered Developer Join Date: Mar 2010 Location: Hamburg/Germany Posts: 10,346	The HDR10+ metadata references areas of the video, so if you scale or crop it (ie. change its size in any way), you would need to update the metadata accordingly. __________________ LAV Filters - open source ffmpeg based media splitter and decoders Last edited by nevcairiel; 4th February 2019 at 11:02.

4th February 2019, 13:03	#52 \| Link
quietvoid Registered User Join Date: Jan 2019 Location: Canada Posts: 574	I'm thinking it's all mostly based on luminance. There's info about every luminance percentile for a frame and a value associated to it. However I'm not sure what these values refer to, nor what Average Max RGB is about either.

4th February 2019, 13:43	#53 \| Link
jlpsvk Registered User Join Date: Dec 2014 Posts: 240	anyone know, how to update those metadata for cropped encode? __________________ AMD Ryzen 9 5950X, 32GB DDR4-3200 CL16, RTX 3060, 2TB NVMe PCIE4.0, NAS with 8x16TB HDD

4th February 2019, 20:08	#55 \| Link
Selur Registered User Join Date: Oct 2001 Location: Germany Posts: 7,277	to output the data: Code: ffmpeg -i "E:\Output\HDR-10+.mp4" -vcodec copy -an -sn -vbsf hevc_mp4toannexb -f rawvideo - \| hdr10plus_parser.exe - just to check whether dynamic data is present Code: ffmpeg -i "E:\Output\HDR-10+.mp4" -vcodec copy -an -sn -vbsf hevc_mp4toannexb -f rawvideo - \| hdr10plus_parser.exe - --verify __________________ Hybrid here in the forum, homepage

5th February 2019, 13:18	#59 \| Link
nevcairiel Registered Developer Join Date: Mar 2010 Location: Hamburg/Germany Posts: 10,346	Cropping alone wouldn't change the primary image information (assuming you only crop black bars). However, the metadata also references spatial windows in the image, which would get displaced if you crop, so those would at the very least need to be re-positioned. Without proper tool support to do all of this, I would not bother trying to crop yet. __________________ LAV Filters - open source ffmpeg based media splitter and decoders

5th February 2019, 13:45	#60 \| Link
jlpsvk Registered User Join Date: Dec 2014 Posts: 240	yeah. i was meaning cropping, not resizing. so hdr10+ encodes without cropping for now. __________________ AMD Ryzen 9 5950X, 32GB DDR4-3200 CL16, RTX 3060, 2TB NVMe PCIE4.0, NAS with 8x16TB HDD

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