|
International
Standard
ISO/IEC 23000-19
Third edition
Information technology —
2024-02
Multimedia application format
(MPEG-A) —
AMENDMENT 1
2024-07
Part 19:
Common media application format
(CMAF) for segmented media
AMENDMENT 1: Low complexity
enhancement video Coding (LCEVC)
and other technologies
Technologies de l'information — Format pour application
multimédia (MPEG-A) —
Partie 19: Format CMAF (Common Media Application Format)
pour médias segmentés
AMENDEMENT 1: Codage vidéo d'amélioration de faible
complexité (LCEVC) et autres technologies
Reference number
ISO/IEC 23000-19:2024/Amd. 1:2024(en) © ISO/IEC 2024
ISO/IEC 23000-19:2024/Amd. 1:2024(en)
© ISO/IEC 2024
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 on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: [email protected]
Website: www.iso.org
Published in Switzerland
© ISO/IEC 2024 – All rights reserved
ii
ISO/IEC 23000-19:2024/Amd. 1:2024(en)
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 /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 /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 23000 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
/national-committees.
© ISO/IEC 2024 – All rights reserved
iii
ISO/IEC 23000-19:2024/Amd. 1:2024(en)
Information technology — Multimedia application format
(MPEG-A) —
Part 19:
Common media application format (CMAF) for segmented media
AMENDMENT 1: Low complexity enhancement video Coding
(LCEVC) and other technologies
Clause 2, Normative references
Add the following document:
ISO/IEC 23094-2:2021, Information technology — General video coding — Part 2: Low complexity enhancement
video coding
Clause 4
Add the following abbreviated terms:
EVC essential video coding
LCEVC low complexcity enhancement video coding
VVC verstaile video coding
Clause 5
Add the following text:
Annex O describes packaging and codec constraints for some CMAF media profiles using the LCEVC video
codec. Systems claiming conformance to CMAF using LCEVC shall conform to the provisions of Annex O.
Annex O
Add the following new annex after Annex N, before the Bibliography:
© ISO/IEC 2024 – All rights reserved
ISO/IEC 23000-19:2024/Amd. 1:2024(en)
Annex O
(normative)
LCEVC media profile and track format
O.1 Dependent CMAF tracks
The LCEVC media profile makes use of Dependent CMAF Tracks, as defined in Clause H.1.
O.2 LCEVC CMAF tracks
LCEVC CMAF tracks shall conform to Clauses 7, 8, 9, and 12 and shall additionally conform to the constraints
specified in this annex.
Each LCEVC CMAF track that does not contain the Base Codec VCL NAL units is a dependent CMAF track,
and the constraints specified for dependent CMAF tracks in Clause H.1 shall apply. It is expected that the
manifest provides signalling to express the dependency of a dependent LCEVC CMAF track on a Base CMAF
track, for example, using the @dependencyID in a DASH MPD.
O.3 CMAF switching set constraints for LCEVC CMAF tracks and media profiles
O.3.1 General
Subclause 9.2.3 shall apply with the following additional constraints.
— Each CMAF track with sample entry 'lvc1' shall conform to the LCEVC media profile and track format as
specified in this annex.
— Each CMAF track containing a Base bitstream or an LCEVC bitstream or part thereof shall contain exactly
one ISO BMFF track with a Base bitstream or an LCEVC bitstream, respectively.
— When two CMAF tracks are present for carrying Base and LCEVC bitstreams, the corresponding ISO
BMFF tracks shall use distinct track IDs.
— CMAF switching sets containing a media profile listed in clause O.6 with sample entry 'lvc1' shall conform
to single initialization CMAF switching set constraints.
Each coded video sequence in an LCEVC bitstream shall contain the necessary parameter sets (Sequence
Configuration, Global Configuration) to signal decoding parameters changes allowed between CMAF tracks
in the same switching set.
O.3.2 Sample Description Box ('stsd')
Subclauses 9.2.4 and 9.3.2.2 shall apply with the following additional restrictions.
A decoder configuration re
...