ISO/IEC 23090-25:2025

International
Standard
ISO/IEC 23090-25
First edition
Information technology — Coded
2025-01
representation of immersive media —
Part 25:
Conformance and reference
software for carriage of visual
volumetric video-based coding data
Technologies de l'information — Représentation codée de média
immersifs —
Partie 25: Conformité et logiciel de référence pour le transport de
données de codage basé sur la vidéo volumétrique
Reference number
© ISO/IEC 2025
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© ISO/IEC 2025 – All rights reserved
ii
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Abbreviated terms . 1
5 Reference software for ISO/IEC 23090-10 . 2
5.1 General .2
5.2 Architecture .2
5.3 Features .2
5.4 V3C carriage library API .4
5.4.1 General .4
5.4.2 V3CCreateBox.4
5.4.3 V3CCreateAtlasParamSampleGroupDescriptionEntry .4
5.4.4 V3CAddSetupUnitToAtlasParamSampleGroupEntry .5
5.4.5 V3CPutAtlasParamSampleGroupEntry .5
5.4.6 V3CGetAtlasParamSampleGroupDescriptionEntryNALCnt.5
5.4.7 V3CGetNALUnitFromAtlasParamSampleGroupEntry.5
5.4.8 V3CNewBitstreamSampleEntry .6
5.4.9 V3CNewAtlasSampleEntry .6
5.4.10 V3CNewAtlasTileSampleEntry .6
5.4.11 V3CAddV3CParameterSet .6
5.4.12 V3CAddSetupUnit .7
5.4.13 V3CAddUnitHeader .7
5.4.14 V3CAddTileId.7
5.4.15 V3CSetLodIdx .7
5.4.16 V3CGetCommonInfoFromSampleEntry .7
5.4.17 V3CGetUnitHeaderInfoFromResvSampleEntry .8
5.4.18 V3CGetV3CParameterSet .8
5.4.19 V3CGetSetupUnit .9
5.4.20 V3CGetUnitHeader .9
5.4.21 V3CGetSetupUnitCnt .9
5.4.22 V3CGetTileIdCnt .9
5.4.23 V3CGetTileId .9
5.4.24 V3CGetLodIdx .10
5.4.25 V3CParseBox .10
5.4.26 V3CParseUnknownBox .10
5.4.27 V3CNewVideoHEVCSampleEntry .10
5.5 Usage of V3CCarriageApp .10
5.6 Copyright disclaimer for software modules .11
6 Conformance for ISO/IEC 23090-10 .11
6.1 General .11
6.2 Timed V3C for DASH .11
6.2.1 General .11
6.2.2 RedAndBlack . . . 12
6.2.3 Soldier . 13
6.2.4 LongDress . 13
6.2.5 Mitch . 13
6.2.6 Thomas .14
6.3 Timed V3C . . .14
6.3.1 General .14
6.3.2 timed_vpcc_01.mp4 . 15
6.3.3 timed_vpcc_02.mp4 . 15

© ISO/IEC 2025 – All rights reserved
iii
6.3.4 timed_miv_01.mp4 . 15
6.3.5 timed_miv_02.mp4 .16
6.3.6 S24C2RAR04_redandblack.mp4 .16
6.3.7 S25C2RAR04_soldier.mp4 .16
6.3.8 S26C2RAR04_longdress.mp4 .16
6.3.9 S42C2RAR04_mitch.mp4 .16
6.3.10 S43C2RAR04_thomas.mp4 .16
6.4 Non-timed V3C .16
6.4.1 General .16
6.4.2 non_timed_vpcc_01.mp4 .17
6.4.3 non_timed_miv_01.mp4 .17
Bibliography .18

© ISO/IEC 2025 – All rights reserved
iv
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 not
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.
A list of all parts in the ISO/IEC 23090 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 2025 – All rights reserved
v
Introduction
The conformance and reference software in this document serves two main purposes:
— Validation of the written specification of ISO/IEC 23090-10;
— Conformance testing for checking interoperability for the various applications against the reference
software which aims to be compliant with ISO/IEC 23090-10.
The reference software is structured as an extension of the ISOBMFF reference software library and provides
additional functions required for ISO/IEC 23090-10. In addition, it includes a small command line application
that uses the library to perform some basic file operations such as multiplexing and demultiplexing a file.
Furthermore, this document is accompanied by a collection of conformance files. These files provide practical
demonstrations of various features of ISO/IEC 23090-10, aiding in a more comprehensive understanding
and application of ISO/IEC 23090-10.

© ISO/IEC 2025 – All rights reserved
vi
International Standard ISO/IEC 23090-25:2025(en)
Information technology — Coded representation of
immersive media —
Part 25:
Conformance and reference software for carriage of visual
volumetric video-based coding data
1 Scope
This document specifies the reference software for carriage of V3C data as specified in ISO/IEC 23090-10.
The information provided describes the reference software modules and the features that it supports. It also
provides a description of how the reference software can be utilized. Finally, it also provides a description of
conformance test vectors.
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 23090-10, Information technology — Coded representation of immersive media — Part 10: Carriage of
visual volumetric video-based coding data
3 Terms and definitions
No terms and definitions are listed in this document.
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/
4 Abbreviated terms
ISOBMFF ISO base media file format
MIV MPEG immersive video
PCC point cloud compression
V3C visual volumetric video-based coding
V-PCC video-based point cloud compression

© ISO/IEC 2025 – All rights reserved
5 Reference software for ISO/IEC 23090-10
5.1 General
The reference software and conformance files are available at:
https:// standards .iso .org/ iso -iec/ 23090/ -25/ ed -1/ en/
5.2 Architecture
Figure 1 shows a simplified overview of the reference software implementation architecture for the carriage
of visual volumetric video-based coding data. The reference software implementation implements the
[2]
features defined in ISO/IEC 23090-10 and is based on the reference software for ISOBMFF, the reference
[1]
software for MIV and other supporting libraries. Boxes with a gray background in Figure 1 are part of the
scope of the reference software implementation and are described in more detail in the following sections.
Key
scope of this project
out of scope
dependency
Figure 1 — Architecture overview
The reference software implementation consists of the V3C carriage library libV3CCarriage, and the
command line application with the name V3CCarriageApp. While the library implements an API to parse and
write data structures as defined in 23090-10, the command line application uses this API together with other
helping libraries to implement actual multiplexing and demultiplexing functionality. The documentation
[3]
of the API and associated classes and functions is done using Doxygen and can be built by running the
Doxygen command in the root folder.
5.3 Features
Table 1 summarizes a list of features adopted in the V3C carriage specification and indicates which features
are currently supported by the reference software.

© ISO/IEC 2025 – All rights reserved
Table 1 — V3C Reference Software Feature Support List
Feature 4CCs Version Status
v3cC
Common V3CConfigurationBox 0 OK
vunt
V3CUnitHeaderBox 0 OK
vaps
V3CAtlasParamSampleGroupDescriptionEntry 0 OK
swpc
ObjectSwitchAlternativesBox 0 OK
Single track V3CBitstreamSampleEntry v3e1 v3eg 0 OK
Multiplexer N/A Not Implemented
Demultiplexer N/A Not Implemented
Sub-samples N/A Not Implemented
Multi track V3CAtlasSampleEntry v3c1 v3cg 0 OK
v3cb v3a1
v3ag
v3tC
V3CAtlasTileConfigurationBox 0 OK
v3t1
V3CAtlasTileSampleEntry 0 OK
mmvi
MultiMapVideoBox 0 OK
potg
PlayoutTrackGroupBox 0 OK
Single atlas multiplexer N/A OK
Single atlas demultiplexer N/A OK
Single atlas tiles multiplexer N/A Not Implemented
Single atlas tiles demultiplexer N/A Not Implemented
Multi atlas multiplexer N/A OK
Multi atlas demultiplexer N/A OK
v3cp
Non-timed V3CConfigurationProperty 0 OK
vutp
V3CUnitHeaderProperty 0 OK
v3tp
V3CAtlasTileConfigurationProperty 0 OK
eply
PlayoutEntityToGroupBox 0 OK
Single atlas multiplexer N/A OK
Single atlas demultiplexer N/A Not Implemented
Single atlas tiles multiplexer N/A Not Implemented
Single atlas tiles demultiplexer N/A Not Implemented
Multi atlas multiplexer N/A OK
Multi atlas demultiplexer N/A OK

© ISO/IEC 2025 – All rights reserved
TTabablele 1 1 ((ccoonnttiinnueuedd))
Feature 4CCs Version Status
Partial Vector3 N/A OK
access
V3CBoundingBox N/A OK
TileMapping N/A OK
V3CObject N/A OK
V3CObjectCollection N/A OK
V3CSpatialRegion
...