ISO/IEC 23002-7:2024

International
Standard
ISO/IEC 23002-7
Third edition
Information technology — MPEG
2024-10
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 2024
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© ISO/IEC 2024 – All rights reserved
ii
Contents Page
Foreword .vi
Introduction .vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
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 . 13
5.10 Variables, syntax elements and tables. 13
5.11 Text description of logical operations .14
5.12 Processes .16
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 . 19
7.1 General .19
7.2 VUI parameters syntax .19
7.3 VUI parameters semantics. 20
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 Rec. ITU-T T.35 SEI message . 29
8.3.1 User data registered by Rec. ITU-T T.35 SEI message syntax . 29
8.3.2 User data registered by Rec. ITU-T T.35 SEI message semantics . 29
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 . 30
8.5.1 Film grain characteristics SEI message syntax . 30
8.5.2 Film grain characteristics SEI message semantics .31
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 . 39
8.7 Parameter sets inclusion indication SEI message . 46
8.7.1 Parameter sets inclusion indication SEI message syntax . 46
8.7.2 Parameter sets inclusion indication SEI message semantics . 46
8.8 Decoded picture hash SEI message .47
8.8.1 Decoded picture hash SEI message syntax .47
8.8.2 Decoded picture hash SEI message semantics .47
8.9 Mastering display colour volume SEI message . 49
8.9.1 Mastering display colour volume SEI message syntax . 49

© ISO/IEC 2024 – All rights reserved
iii
8.9.2 Mastering display colour volume SEI message semantics . 49
8.10 Content light level information SEI message .51
8.10.1 Content light level information SEI message syntax .51
8.10.2 Content light level information SEI message semantics .51
8.11 Dependent random access point indication SEI message .52
8.11.1 Dependent random access point indication SEI message syntax .52
8.11.2 Dependent random access point indication SEI message semantics .52
8.12 Alternative transfer characteristics information SEI message . 53
8.12.1 Alternative transfer characteristics information SEI message syntax . 53
8.12.2 Alternative transfer characteristics SEI message semantics . 53
8.13 Ambient viewing environment SEI message. 53
8.13.1 Ambient viewing environment SEI message syntax . 53
8.13.2 Ambient viewing environment SEI message semantics . 53
8.14 Content colour volume SEI message . 54
8.14.1 Content colour volume SEI message syntax . 54
8.14.2 Content colour volume SEI message semantics . 54
8.15 Omnidirectional video specific SEI messages .57
8.15.1 Sample location remapping process .57
8.15.2 Equirectangular projection SEI message .67
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 . 77
8.15.6 Omnidirectional viewport SEI message . 84
8.16 Frame-field information SEI message . 86
8.16.1 Frame-field information SEI message syntax . 86
8.16.2 Frame-field information SEI message semantics . 86
8.17 Sample aspect ratio information SEI message . 89
8.17.1 Sample aspect ratio information SEI message syntax . 89
8.17.2 Sample aspect ratio information SEI message semantics . 89
8.18 Annotated regions SEI message . 90
8.18.1 Annotated regions SEI message syntax . 90
8.18.2 Annotated regions SEI message semantics .91
8.19 Scalability dimension information SEI message . 94
8.19.1 Scalability dimension information SEI message syntax . 94
8.19.2 Scalability dimension information SEI message semantics . 95
8.20 Multiview acquisition information SEI message . 96
8.20.1 Multiview acquisition information SEI message syntax . 96
8.20.2 Multiview acquisition information SEI message semantics . 97
8.21 Multiview view position SEI message . 101
8.21.1 Multiview view position SEI message syntax . 101
8.21.2 Multiview view position SEI message semantics . 101
8.22 Depth representation information SEI message . 102
8.22.1 Depth representation information SEI message syntax . 102
8.22.2 Depth representation information SEI message semantics . 102
8.23 Alpha channel information SEI message . 106
8.23.1 Alpha channel information SEI message syntax . 106
8.23.2 Alpha channel information SEI message semantics . 106
8.24 Extended DRAP indication SEI message . 109
8.24.1 Extended DRAP indication SEI message syntax . 109
8.24.2 Extended DRAP indication SEI message semantics . 109
8.25 Display orientation SEI message .110
8.25.1 Display orientation SEI message syntax .110
8.25.2 Display orientation SEI message semantics . 111
8.26 Colour transform information SEI message . 112
8.26.1 Colour transform information SEI message syntax . 112
8.26.2 Colour transform information SEI message semantics . 112
8.27 Shutter interval information SEI message .116
8.27.1 Shutter interval information SEI message syntax .116
8.27.2 Shutter interval information SEI message semantics .116

© ISO/IEC 2024 – All rights reserved
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8.28 Neural-network post-filter SEI messages .117
8.28.1 General post-processing filtering process using NNPFs .117
8.28.2 Neural-network post-filter characteristics SEI message . 118
8.28.3 Neural-network post-filter activation SEI message .141
8.29 Phase indication SEI message .143
8.29.1 Phase indication SEI message syntax .143
8.29.2 Phase indication SEI message semantics .143
8.30 Reserved SEI message .145
8.30.1 Reserved SEI message syntax . .145
8.30.2 Reserved SEI message semantics .145
9 Parsing process for k-th order Exp-Golomb codes .145
9.1 General .145
9.2 Mapping process for signed Exp-Golomb codes . 146
Bibliography .148

© ISO/IEC 2024 – All rights reserved
v
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 or www.iec.ch/members_experts/refdocs).
ISO and IEC draw attention to the possibility that the implementation of this document may involve the
use of (a) patent(s). ISO and IEC take no position concerning the evidence, validity or applicability of any
claimed patent rights in respect thereof. As of the date of publication of this document, ISO and IEC had
received notice of (a) patent(s) which may be required to implement this document. However, implementers
are cautioned that this may not represent the latest information, which may be obtained from the patent
database available at www.iso.org/patents and https://patents.iec.ch. ISO and IEC shall not be held
responsible for identifying any or all such patent rights.
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.
In the IEC, see www.iec.ch/understanding-standards.
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 (as Rec. ITU-T H.274).
This third edition cancels and replaces the second edition (ISO/IEC 23002-7:2022), which has been
technically revised.
The main changes are as follows:
— the addition of the shutter interval information SEI message,
— the addition of the neural-network post-filter characteristics SEI message,
— the addition of the neural-network post-filter activation SEI message, and
— the addition of the phase indication SEI message.
A list of all parts in the ISO/IEC 23002 series can be found on the ISO and IEC websites.
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 and
www.iec.ch/national-committees.

© ISO/IEC 2024 – All rights reserved
vi
Introduction
Versions of this document
Rec. ITU-T H.274 | ISO/IEC 23002-7 version 1 refers to the first approved version of this document. The
first edition published by ITU-T as Rec. ITU-T H.274 (08/2020) and by ISO/IEC as ISO/IEC 23002-7:2021
corresponded to the first version.
Rec. ITU-T H.274 | ISO/IEC 23002-7 version 2 refers to the integrated text containing nine additional SEI
messages, namely the annotated regions SEI message, the alpha channel information SEI message, the depth
representation information SEI message, the multiview acquisition information SEI message, the multiview
view position SEI message, the scalability dimension information SEI message, the extended dependent
random access point indication SEI message, the display orientation SEI message, and the colour transform
information SEI message. Besides these additional SEI messages, this version also contains corrections to
various minor defects in the prior content of the specification. The second edition published by ITU-T as Rec.
ITU-T H.274 (05/2022) and by ISO/IEC as ISO/IEC 23002-7:2022 corresponds to the second version.
Rec. ITU-T H.274 | ISO/IEC 23002-7 version 3 (the current version) refers to the integrated text containing
four additional SEI messages, namely the shutter interval information SEI message, the neural-network
post-filter characteristics SEI message, the neural-network post-filter activation SEI message, and the phase
indication SEI message. Besides these additional SEI messages, this version also contains corrections to
various minor defects in the prior content of the specification. The third edition published by ISO/IEC as
to the third edition published by ITU-T as Rec. ITU-T H.274 (09/2023).
Conventions
The term "this document" is used to refer to this Recommendation | International Standard.
In this document, the following verbal forms are used:
— “shall” indicates a requirement. When used to express a mandatory constraint on the values of syntax
elements or the values of variables derived from these syntax elements, it is the responsibility of the
encoder to ensure that the constraint is fulfilled.
— “should” indicates a recommendation. It is used to refer to behaviour of an implementation that is
encouraged to be followed under anticipated ordinary circumstances, but is not a requirement for
conformance to this document.
— “may” indicates a permission.
— “can” indicates a possibility or a capability.
Information marked as “NOTE” is intended to assist the understanding or use of the document. “Notes to
entry” used in Clause 3 provide additional information that supplements the terminological data and can
contain provisions relating to the use of a term.

© ISO/IEC 2024 – All rights reserved
vii
International Standard ISO/IEC 23002-7:2024(en)
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 is drafted in a manner intended
to be sufficiently generic that 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.
ISO/IEC 10646, Information technology — Universal coded character set (UCS)
ISO/IEC 11578:1996, Information technology — Open Systems Interconnection — Remote Procedure Call (RPC)
ISO/IEC 15938-17, Information technology — Multimedia content description interface — Part 17: Compression
of neural networks for multimedia content description and analysis
Rec. ITU-T H.273 | ISO/IEC 23091-2, Information technology — Coding-independent code points — Part 2: Video
Rec. ITU-T T.35:2000, Procedure for the allocation of ITU-T defined codes for non-standard facilities
ISO/CIE 11664-1, Colorimetry — Part 1: CIE standard colorimetric observers
IETF RFC 1321, The MD5 Message-Digest Algorithm
IETF RFC 4151, The ‘tag’ URI Scheme
IETF RFC 5646, Tags for Identifying Languages.
IETF RFC 3986, Uniform Resource Identifiers (URI): Generic Syntax

© ISO/IEC 2024 – All rights reserved
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
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
alpha blending
process in which an auxiliary coded picture is used in combination with a primary coded picture and with
other data not specified by this document in the display process
Note 1 to entry: In an alpha blending process, the luma samples of an auxiliary coded picture are interpreted as
indications of the degree of opacity (or, equivalently, the degrees of transparency) associated with corresponding
samples of the primary coded picture.
3.4
associated IRAP picture
previous IRAP picture (when present) in decoding order, for a particular picture, in the same layer as the
particular picture
3.5
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.
3.6
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
3.7
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.
3.8
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
© ISO/IEC 2024 – All rights reserved
3.9
CLVSS PU
PU in which the coded picture is a CLVSS picture
3.10
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.
3.11
coded picture
coded representation of a picture containing all CTUs of the picture
3.12
coded slice NAL unit
NAL unit that contains a coded slice
3.13
coded video bitstream
sequence of bits that forms the representation of a sequence of AUs forming one or more CVSs
3.14
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
3.15
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
3.16
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
3.17
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
3.18
cropped decoded picture
result of cropping a decoded picture based on the conformance cropping window for the corresponding
coded picture
3.19
decoded picture
decoded picture is derived by decoding a coded picture
3.20
decoder
embodiment of a decoding process
3.21
decoding order
order in which syntax elements are conveyed in the coded video bitstream and are processed by a decoding process

© ISO/IEC 2024 – All rights reserved
3.22
decoding process
process that reads a coded video bitstream and derives decoded pictures from it
3.23
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 latitude 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.
3.24
encoder
embodiment of an encoding process
3.25
encoding process
process that produces a coded video bitstream
3.26
field
assembly of alternative rows of samples of a frame
3.27
flag
variable or single-bit syntax element that can take one of the two possible values: 0 and 1
3.28
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
3.29
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.
3.30
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.
3.31
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
3.32
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
© ISO/IEC 2024 – All rights reserved
3.33
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.
3.34
leading picture
picture that is in the same layer as the associated IRAP picture and precedes the associated IRAP picture in
output order
3.35
local coordinate axes
coordinate axes having a specified rotation relationship relative to the global coordinate axes
3.36
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.
3.37
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
3.38
non-VCL NAL unit
NAL unit that is not a VCL NAL unit
3.39
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
3.40
output order
order in which the decoded pictures are output from the decoder (for the decoded pictures that are to be
output from the decoder)
3.41
output time
time when a decoded picture is to be output from the decoder (for the decoded pictures that are to be output
from the decoder)
3.42
packed region
region in a region-wise packed picture that is mapped to a projected region according to a region-wise packing
3.43
picture
array of luma samples in monochrome format or an array of luma samples and two corresponding arrays of
chroma samples in 4:2:0, 4:2:2, and 4:4:4 colour format
Note 1 to entry: A picture could be either a frame or a field. However, in one CLVS, either all pictures are frames or all
pictures are fields.
© ISO/IEC 2024 – All rights reserved
3.44
PPS
picture parameter set
A syntax structure containing syntax elements that apply to zero or more entire coded pictures as determined
by a syntax element that is the same for all slices of a picture and found in the picture header or slice headers
of each picture
3.45
PU
picture unit
set of NAL units that contain all VCL NAL units of a coded picture and their associated non-VCL NAL units
3.46
projected picture
picture that uses a projection format for omnidirectional video
3.47
projected region
region in a projected picture that is mapped to a packed region according to a region-wise packing
3.48
projection
specified correspondence between the colour samples of a projected picture and azimuth and elevation
positions on a sphere
3.49
random access
act of starting the decoding process for a coded video bitstream at a point other than the beginning of the
bitstream
3.50
RASL picture
leading picture that cannot be correctly decoded when the decoding process starts from the associated
IRAP picture
3.51
reference picture
picture that contains samples that could be used for inter prediction in the decoding process of subsequent
pictures in decoding order
3.52
reference picture list
list of reference pictures that is used for inter prediction of a slice
3.53
region-wise packed picture
decoded picture that contains one or more packed regions
Note 1 to entry: A region-wise packed picture could contain a region-wise packing of a projected picture.
3.54
region-wise packing
transformation, resizing, and relocation of packed regions of a region-wise packed picture to remap the packed
regions to projected regions of a projected picture
3.55
sample aspect ratio
indicated width-to-height aspect ratio of the luma samples of the associated decoded pictures

© ISO/IEC 2024 – All rights reserved
3.56
slice
region of a picture that can be decoded separately from other regions of the same coded picture (although
in some cases the decoding process for the picture might use inter prediction that makes reference to other
previously decoded reference pictures)
3.57
source
term used to describe the video material or some of its attributes before encoding
3.58
sphere coordinates
azimuth and elevation angles identifying a location of a point on a sphere
3.59
sphere region
region on a sphere, specified either by four great circles or by two azimuth circles and two elevation circles, or
such a region on a rotated sphere after applying yaw, pitch, and roll rotations
3.60
STSA picture
coded picture that enables up-switching, at the coded picture, to the temporal sublayer containing the coded
picture, from the immediately lower temporal sublayer of the same layer when the coded picture does not
belong to the lowest temporal sublayer
Note 1 to entry: An STSA picture does not use pictures in the same layer and with the same temporal sublayer
identifier as the STSA picture for inter prediction reference. Pictures following an STSA picture in decoding order
in the same layer and with the same temporal sublayer identifier as the STSA picture do not use pictures prior to the
STSA picture in decoding order in the same layer and with the same temporal sublayer identifier as the STSA picture
for inter prediction reference. STSA pictures in an independent layer (i.e., a layer that does not depend on other layers
in its decoding) always have a temporal sublayer identifier greater than 0.
3.61
syntax element
element of data represented in a syntax structure
3.62
syntax structure
zero or more syntax elements that are present together in a specified order in a string of data bits, where the
left-most bit is considered to be the first and most significant
...