xREL.v3

High Definition x264 and Ultra High Definition x265 Standards Addendum 1
Revision 5.0 Addendum 1 - 2022-10-18

[ Intro ]
When revision 5.0 was made, an attempt was made to write some rules for Dolby Vision and HDR10+ inclusion.

However these rules have been shown not to work, as things have just turned out differently than
what was thought back in 2020.

We seem to have come to a point, where Dolby Vision (DV) can now be muxed into mkv files, but it can
be done several ways,
which might look the same in mediainfo, but play very differently, depending on the player used.

This addendum is written to try to create a work flow, that will be used by all groups, and will
ONLY cover the parts in the
rules, that are related to Dolby Vison and HDR10+. It will ensure that all releases will be done the
same way, no matter which
group does the actual release.

FEL vs MEL (RPU)
Due to the size of the FEL, which can add up to 10-12GB to a release, with close to no gain in
quality, it has been decided to
use just the RPU to make releases. The RPU typically adds 30-50 MB. The FEL can also not just be
used on an x265 encode, since
the frame type and order must be the same in the BL and the EL. Encoding the BL will ruin the
original frame order, and the
FEL will not work.

Dolby Vision Profile
From what various groups has experienced, it seems like Profile 8 currently has the best compatibility. Surely there will be
players or TV's that doesn't support Profile 8, but Profile 7 is supported by even less devices.

Only rule 24.2.x will be affected by this addendum, and the rule numbers is this addendum, has
nothing to do with the rule
numbers in the current version of the rules.

Compliance with this document is optional as of its pre date, and mandatory as of 2022-11-01 00:00:00 UTC (1667260800 Unix time).

24.2) Notes
24.2.1) If a 4k BD contains DV, the final release must be Profile 8.1 (DV with HDR10 fallback)
Suggested workflow:
Demux the BL and EL layers
Encode the BL layer with x265 following all the rules
Use dovi_tool, or other available tools, to inject the RPU from the EL into the encoded BL
Make sure to use Profile 8 and use --crop option, unless crop values used for the encode are 0
Mux the resulting file
The final mkv file should show the following in mediainfo:
Dolby Vision, Version 1.0, dvhe.08.06, BL+RPU, HDR10 compatible / SMPTE ST 2086, HDR10 compatible
24.2.2) If the movie contains changing AR, the release must be left uncropped.
Don't crop when encoding and don't use the --crop option. This way the original "active area" data in the RPU will
be maintained, and change accordingly when the AR changes.
24.2.3) If a 4k BD contains HDR10+, the HDR10+ metadata must be injected into the encode.
Suggested workflow:
Extract the HDR10+ metadata using hdr10plus_tool. The result should be a .json file
Encode with x265 following all the rules and add "--dhdr10-opt --dhdr10-info <json file>"
Mux the resulting file
The final mkv file should show the following in mediainfo:
SMPTE ST 2094 App 4, Version 1, HDR10+ Profile B compatible
24.2.4) If a 4k BD contains DV and HDR10+, first follow rule 24.2.3 and then rule 24.2.1 skipping
the x265 encoding part.
The resulting file must of course still be able to fall back to HDR10.
The final file should show the following in mediainfo:
Dolby Vision, Version 1.0, dvhe.08.06, BL+RPU, HDR10 compatible / SMPTE ST 2094 App 4, Version 1, HDR10+ Profile
B compatible
24.2.5) Preing a release including DV/HDR10+ of a previous release pred before this addendum, is not allowed and will be
considered a dupe of the previous release. Use INTERNAL for such releases.
24.2.6) It must be noted in the nfo, what the release contains. SDR/HDR10/HDR10+/DV.

[ Signed (in alphabetical order) - 28 Groups ]

AMIABLE ARCHiViST DAA B0MBARDIERS DoNE FACELESSCREW FLAME GAZPROM GMAY GreenBlade GUHZER HAiDEAF IcHoR IAMABLE iNGOT JustWatch
MiMiC OADG PSYCHD RCDiVX RedBlade REWARD SCOTLUHD SHORTBREHD SURCODE WATCHABLE WEST YAMG

[ Refused to Sign (in alphabetical order) - 0 Groups ]

[ Revisions ]
2007-04-28 - High.Def.x264.movie.standards.rls.1-NFO
2007-07-05 - High.Def.x264.Movie.Standards.Rev2
2008-10-13 - High.Definition.x264.Standards.Revision.3.0-HDX
2008-12-20 - High.Definition.x264.Standards.Revision.3.1-HDX
2009-01-27 - High.Definition.x264.Standards.Revision.3.1.Addendum.1-HDX
2011-01-29 - High.Definition.x264.Standards.Revision.4.0-HDX
2011-01-29 - High.Definition.x264.Standards.Revision.4.0.UPDATE-HDX
2020-04-15 - High.Definition.x264.and.Ultra.High.Definition.x265.Standards.Revision.5.0-HDX - Total rewrite, hardened all rules, switched to CRF, UHD and x265 are supported.
2022-10-18 - High.Definition.x264.and.Ultra.High.Definition.x265.Standards.Revision.5.0.Addendum.1-HDX - Rules concerning Dolby Vision and HDR10+ totally rewritten