ISO/IEC 23002-7:2021

INTERNATIONAL ISO/IEC
STANDARD 23002-7
First edition
2021-01
Information technology — MPEG video
technologies —
Part 7:
Versatile supplemental enhancement
information messages for coded video
bitstreams
Technologies de l'information — Technologies vidéo MPEG —
Partie 7: Messages d'améliorations complémentaires polyvalents pour
les flux binaires vidéo codés
Reference number
ISO/IEC 23002-7:2021(E)
©
ISO/IEC 2021

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ISO/IEC 23002-7:2021(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO/IEC 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
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ISO/IEC 23002-7:2021(E)

Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Abbreviated terms . 8
5 Conventions . 9
5.1 General . 9
5.2 Arithmetic operators . 9
5.3 Logical operators .10
5.4 Relational operators .10
5.5 Bit-wise operators.10
5.6 Assignment operators .11
5.7 Range notation .11
5.8 Mathematical functions .11
5.9 Order of operation precedence .12
5.10 Variables, syntax elements and tables .13
5.11 Text description of logical operations .14
5.12 Processes .15
6 Syntax and semantics .16
6.1 General .16
6.2 Method of specifying syntax in tabular form .17
6.3 Specification of syntax functions and descriptors .18
7 Video usability information parameters .18
7.1 General .18
7.2 VUI parameters syntax .19
7.3 VUI parameters semantics .19
8 SEI messages .27
8.1 General .27
8.2 Filler payload SEI message .28
8.2.1 Filler payload SEI message syntax .28
8.2.2 Filler payload SEI message semantics .28
8.3 User data registered by Recommendation ITU-T T.35 SEI message .28
8.3.1 User data registered by Recommendation ITU-T T.35 SEI message syntax .28
8.3.2 User data registered by Recommendation ITU-T T.35 SEI message semantics .28
8.4 User data unregistered SEI message .29
8.4.1 User data unregistered SEI message syntax .29
8.4.2 User data unregistered SEI message semantics .29
8.5 Film grain characteristics SEI message .29
8.5.1 Film grain characteristics SEI message syntax .29
8.5.2 Film grain characteristics SEI message semantics .30
8.6 Frame packing arrangement SEI message .38
8.6.1 Frame packing arrangement SEI message syntax .38
8.6.2 Frame packing arrangement SEI message semantics .38
8.7 Parameter sets inclusion indication SEI message .47
8.7.1 Parameter sets inclusion indication SEI message syntax .47
8.7.2 Parameter sets inclusion indication SEI message semantics .47
8.8 Decoded picture hash SEI message .48
8.8.1 Decoded picture hash SEI message syntax.48
8.8.2 Decoded picture hash SEI message semantics .48
8.9 Mastering display colour volume SEI message .50
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ISO/IEC 23002-7:2021(E)

8.9.1 Mastering display colour volume SEI message syntax .50
8.9.2 Mastering display colour volume SEI message semantics .50
8.10 Content light level information SEI message .52
8.10.1 Content light level information SEI message syntax .52
8.10.2 Content light level information SEI message semantics .52
8.11 Dependent random access point indication SEI message .53
8.11.1 Dependent random access point indication SEI message syntax .53
8.11.2 Dependent random access point indication SEI message semantics .53
8.12 Alternative transfer characteristics information SEI message .54
8.12.1 Alternative transfer characteristics information SEI message syntax.54
8.12.2 Alternative transfer characteristics SEI message semantics .54
8.13 Ambient viewing environment SEI message .54
8.13.1 Ambient viewing environment SEI message syntax .54
8.13.2 Ambient viewing environment SEI message semantics .54
8.14 Content colour volume SEI message .55
8.14.1 Content colour volume SEI message syntax .55
8.14.2 Content colour volume SEI message semantics .55
8.15 Omnidirectional video specific SEI messages .58
8.15.1 Sample location remapping process .58
8.15.2 Equirectangular projection SEI message .68
8.15.3 Generalized cubemap projection SEI message .70
8.15.4 Sphere rotation SEI message .76
8.15.5 Region-wise packing SEI message .78
8.15.6 Omnidirectional viewport SEI message .85
8.16 Frame-field information SEI message .87
8.16.1 Frame-field information SEI message syntax .87
8.16.2 Frame-field information SEI message semantics .87
8.17 Sample aspect ratio information SEI message .90
8.17.1 Sample aspect ratio information SEI message syntax .90
8.17.2 Sample aspect ratio information SEI message semantics .90
8.18 Reserved SEI message .91
8.18.1 Reserved SEI message syntax .91
8.18.2 Reserved SEI message semantics .91
9 Parsing process for k-th order Exp-Golomb codes .91
9.1 General .91
9.2 Mapping process for signed Exp-Golomb codes .92
Bibliography .94
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ISO/IEC 23002-7:2021(E)

Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that
are members of ISO or IEC participate in the development of International Standards through
technical committees established by the respective organization to deal with particular fields of
technical activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other
international organizations, governmental and non-governmental, in liaison with ISO and IEC, also
take part in the work.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for
the different types of document should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject
of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent
rights. Details of any patent rights identified during the development of the document will be in the
Introduction and/or on the ISO list of patent declarations received (see www .iso .org/ patents) or the IEC
list of patent declarations received (see patents.iec.ch).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/
iso/ foreword .html.
This document was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology,
Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information information, in
collaboration with ITU-T. The technically identical text is published as Recommendation ITU-T H.274
(08/2020).
A list of all parts in the ISO/IEC 23002 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
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ISO/IEC 23002-7:2021(E)

Introduction
The International Organization for Standardization (ISO) and International Electrotechnical
Commission (IEC) draw attention to the fact that it is claimed that compliance with this document may
involve the use of patents.
ISO and IEC take no position concerning the evidence, validity and scope of these patent rights.
The holders of these patent rights have assured ISO and IEC that they are willing to negotiate licences
under reasonable and non-discriminatory terms and conditions with applicants throughout the world.
In this respect, the statements of the holders of these patent rights are registered with ISO and IEC.
Information may be obtained from the patent database available at www .iso .org/ patents.
Attention is drawn to the possibility that some of the elements of this document may be the subject
of patent rights other than those in the patent database. ISO and IEC shall not be held responsible for
identifying any or all such patent rights.
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INTERNATIONAL STANDARD ISO/IEC 23002-7:2021(E)
Information technology — MPEG video technologies —
Part 7:
Versatile supplemental enhancement information
messages for coded video bitstreams
1 Scope
This document specifies the syntax and semantics of video usability information (VUI) parameters and
supplemental enhancement information (SEI) messages. The VUI parameters and SEI messages defined
in this document are designed to be conveyed within coded video bitstreams in a manner specified
in a video coding specification or to be conveyed by other means determined by the specifications for
systems that make use of such coded video bitstreams. This document is particularly intended for use
with coded video bitstreams as specified by Rec. ITU-T H.266 | ISO/IEC 23090-3, although it can also be
used with other types of coded video bitstreams.
VUI parameters and SEI messages can assist in processes related to decoding, display or other purposes.
However, unless otherwise specified in a referencing specification, the interpretation and use of the
VUI parameters and SEI messages specified in this document is not a required functionality of a video
decoder or receiving video system. Although semantics are specified for the VUI parameters and SEI
messages, decoders and receiving video systems can simply ignore the content of the VUI parameters
and SEI messages or can use them in a manner that somewhat differs from what is specified in this
document.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
Recommendation ITU-T H.273 | ISO/IEC 23091-2,Coding-independent code points for video signal
type identification
ISO/CIE 11664-1, Colorimetry — Part 1: CIE standard colorimetric observers
ISO/IEC 11578:1996, Information technology — Open Systems Interconnection — Remote Procedure
Call (RPC)
Recommendation ITU-T T.35:2000, Procedure for the allocation of ITU-T defined codes for non standard
facilities
IETF RFC 1321, The MD5 Message-Digest Algorithm
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
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ISO/IEC 23002-7:2021(E)

3.1
AU
access unit
set of PUs that belong to different layers and contain coded pictures associated with the same output time
3.2
APS
adaptation parameter set
syntax structure containing syntax elements that apply to zero or more slices as determined by zero or
more syntax elements found in slice headers
3.3
associated IRAP picture
previous IRAP picture (when present) in decoding order, for a particular picture, in the same layer as the
particular picture
3.4
azimuth circle
circle on a sphere connecting all points with the same azimuth value
Note 1 to entry: An azimuth circle is always a great circle like a longitude line on the earth.
3.5
byte
sequence of 8 bits, within which, when written or read as a sequence of bit values, the left-most and
right-most bits represent the most and least significant bits, respectively, and the bits are written or
read from left to right
3.6
chroma
sample array or single sample representing one of the two colour difference signals related to the
primary colours, represented by the symbols Cb and Cr
Note 1 to entry: The term chroma is used rather than the term chrominance in order to avoid implying the use of
linear light transfer characteristics that is often associated with the term chrominance.
3.7
CLVS
coded layer video sequence
sequence of PUs of the same layer that consists, in decoding order, of a CLVSS PU, followed by zero or
more PUs that are not CLVSS PUs, including all subsequent PUs up to but not including any subsequent PU
that is a CLVSS PU
3.8
CLVSS PU
PU in which the coded picture is a CLVSS picture
3.9
CLVSS
coded layer video sequence start
coded picture that starts a new CLVS as specified in a video coding specification
Note 1 to entry: In Rec. ITU-T H.266 | ISO/IEC 23090-3, a CLVSS picture is an IRAP picture with
NoIncorrectPicOutputFlag equal to 1 or a gradual decoding refresh picture with NoIncorrectPicOutputFlag equal
to 1. In Rec. ITU-T H.265 | ISO/IEC 23008-2, a CLVSS picture is an IRAP picture with NoRaslOutputFlag equal to 1.
3.10
coded picture
coded representation of a picture containing all CTUs of the picture
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3.11
coded slice NAL unit
NAL unit that contains a coded slice
3.12
coded video bitstream
sequence of bits that forms the representation of a sequence of AUs forming one or more CVSs
3.13
CVS
coded video sequence
sequence of AUs that consists, in decoding order, of a CVSS AU, followed by zero or more AUs that are not
CVSS AUs, including all subsequent AUs up to but not including any subsequent AU that is a CVSS AU
3.14
CVSS AU
AU that has a PU for each layer present in the CVS and the coded picture in each PU is a CLVSS picture
3.15
component
array or single sample from one of the three arrays (luma and two chroma) that compose a picture in
4:2:0, 4:2:2, or 4:4:4 colour format or the array or a single sample of the array that compose a picture in
monochrome format
3.16
constituent picture
part of a spatially frame-packed stereoscopic picture that corresponds to one view, or a picture itself
when frame packing is not in use or the temporal interleaving frame packing arrangement is in use
3.17
cropped decoded picture
result of cropping a decoded picture based on the conformance cropping window for the corresponding
coded picture
3.18
decoded picture
decoded picture is derived by decoding a coded picture
3.19
decoder
embodiment of a decoding process
3.20
decoding order
order in which syntax elements are conveyed in the coded video bitstream and are processed by a
decoding process
3.21
decoding process
process that reads a coded video bitstream and derives decoded pictures from it
3.22
elevation circle
circle on a sphere connecting all points with the same elevation value
Note 1 to entry: An elevation circle is similar to a lattitude line on the earth. Except when the elevation value is
zero, an elevation circle is not a great circle like a longitude circle on the earth.
3.23
encoder
embodiment of an encoding process
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3.24
encoding process
process that produces a coded video bitstream
3.25
field
assembly of alternative rows of samples of a frame
3.26
flag
variable or single-bit syntax element that can take one of the two possible values: 0 and 1
3.27
frame
composition of a top field and a bottom field, where sample rows 0, 2, 4, . originate from the top field
and sample rows 1, 3, 5, . originate from the bottom field
3.28
global coordinate axes
coordinate axes associated with omnidirectional video that are associated with an externally
referenceable position and orientation
Note 1 to entry: The global coordinate axes could correspond to the position and orientation of a device or rig
used for omnidirectional audio/video acquisition as well as the position of an observer's head in the three-
dimensional space of the omnidirectional video rendering environment.
3.29
great circle
intersection of a sphere and a plane that passes through the centre point of the sphere
Note 1 to entry: A great circle is also known as an orthodrome or Riemannian circle.
3.30
inter prediction
aspect of the decoding process for a coded picture that makes use of data derived from the decoding
process of one or more previously decoded reference pictures
3.31
IRAP picture
coded picture starting from which all pictures in the same layer in both decoding order and output order
can be decoded without first decoding any picture in the same layer earlier in decoding order in the
coded video bitstream
3.32
layer
set of VCL NAL units that all have a particular value of layer identifier and the associated non-VCL
NAL units, wherein the layer identifier is a variable for which the value is specified by a video coding
specification
Note 1 to entry: In the contexts of Rec. ITU-T H.266 | ISO/IEC 23090-3 and Rec. ITU-T H.265 | ISO/IEC 23008-2,
the layer identifier is the value of the nuh_layer_id syntax element in the NAL unit header.
3.33
leading picture
picture that is in the same layer as the associated IRAP picture and precedes the associated IRAP picture
in output order
3.34
local coordinate axes
coordinate axes having a specified rotation relationship relative to the global coordinate axes
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3.35
luma
sample array or single sample representing the monochrome signal related to the primary colours,
represented by the symbol or subscript Y or L
Note 1 to entry: The term luma is used rather than the term luminance in order to avoid implying the use of
linear light transfer characteristics that is often associated with the term luminance. The symbol L is sometimes
used instead of the symbol Y to avoid confusion with the symbol y as used for vertical location.
3.36
NAL unit
syntax structure containing an indication of the type of data that follows and bytes containing that data
in a manner that enables the extraction of a string of data bits from the syntax structure
3.37
non-VCL NAL unit
NAL unit that is not a VCL NAL unit
3.38
omnidirectional video
video content in a format that enables rendering according to the user's viewing orientation, e.g., if
viewed using a head-mounted device, or according to a user's desired viewport, reflecting a potentially
rotated viewing position
3.39
output order
order in which the decoded pictures are output from the decoder (for the decoded pictures that are to be
output from the
...