4K UHD conversion.

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philb1701
Posts: 4
Joined: Sat Jul 04, 2015 11:11 am

4K UHD conversion.

Post by philb1701 » Thu Jun 27, 2019 6:24 am

Description of problem or question:

Is Handbrake currently supporting UHD conversion?


Steps to reproduce the problem (If Applicable):




HandBrake version (e.g., 1.0.0):




Operating system and version (e.g., Ubuntu 16.04 LTS, macOS 10.13 High Sierra, Windows 10 Creators Update):




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video.baba
Posts: 59
Joined: Sun May 24, 2015 11:12 am

Re: 4K UHD conversion.

Post by video.baba » Thu Jun 27, 2019 9:53 am

Yes

Woodstock
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Joined: Tue Aug 27, 2013 6:39 am

Re: 4K UHD conversion.

Post by Woodstock » Thu Jun 27, 2019 1:17 pm

While handbrake will compress the file, there are issues with mapping High Dynamic Range colors.

philb1701
Posts: 4
Joined: Sat Jul 04, 2015 11:11 am

Re: 4K UHD conversion.

Post by philb1701 » Tue Aug 13, 2019 5:47 am

So then Handbrake really doesn't transcode 4K videos properly yet, if it has issues with mapping HDR colors.

Woodstock
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Re: 4K UHD conversion.

Post by Woodstock » Tue Aug 13, 2019 1:06 pm

If you look at it that way, it can't do any video, because HDR can be applied to any resolution.

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JohnAStebbins
HandBrake Team
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Joined: Sat Feb 09, 2008 7:21 pm

Re: 4K UHD conversion.

Post by JohnAStebbins » Tue Aug 13, 2019 6:31 pm

HandBrake properly passes through the color characteristics, but does not pass through metadata that is used by monitors/TVs to optimize how they map colors when the display does not support the full HDR color gamut.

"HDR capable TV" is really a misnomer. The TV really isn't HDR capable. I.e. It can't show the full color gamut on the display all at once. "HDR capable" means it knows how to read the metadata and optimize what colors it displays for each frame to give the best reproduction it is capable of.

So HandBrake's output is technically correct (i.e. colors are represented mathematically correctly). But since pretty much no monitor can reproduce the full HDR color gamut, the reproduction without the metadata won't be the same as the reproduction with the metadata.

Palestrina
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Joined: Mon Oct 23, 2017 3:15 pm

Re: 4K UHD conversion.

Post by Palestrina » Thu Aug 29, 2019 11:22 am

Out of curiosity: is it planned for Handbrake to pass through the metadata?

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JohnAStebbins
HandBrake Team
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Joined: Sat Feb 09, 2008 7:21 pm

Re: 4K UHD conversion.

Post by JohnAStebbins » Thu Aug 29, 2019 3:17 pm

Out of curiosity: is it planned for Handbrake to pass through the metadata?
"Plan" is kind of a strong word for what we do around here. It's on a wish list. I (or someone else) may find time to implement it someday. There is nobody currently working on it and no schedule for when someone might look into it.

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