ISO/IEC 23000-19:2024/Amd 1:2024

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
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© ISO/IEC 2024 – All rights reserved
ii
ISO/IEC 23000-19:2024/Amd. 1:2024(en)
Foreword
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Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information.
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© 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
...