ISO/IEC 23000-19:2018/Amd 2:2019
(Amendment)Information technology — Multimedia application format (MPEG-A) — Part 19: Common media application format (CMAF) for segmented media — Amendment 2: XHE-AAC and other media profiles
Information technology — Multimedia application format (MPEG-A) — Part 19: Common media application format (CMAF) for segmented media — Amendment 2: XHE-AAC and other media profiles
Technologies de l'information — Format pour application multimédia (MPEG-A) — Partie 19: Format CMAF (Common Media Application Format) pour médias segmentés — Amendement 2: XHE-AAC et autres profils médias
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INTERNATIONAL ISO/IEC
STANDARD 23000-19
First edition
2018-01-30
AMENDMENT 2
2019-01
Information technology — Multimedia
application format (MPEG-A) —
Part 19:
Common media application format
(CMAF) for segmented media
AMENDMENT 2: XHE-AAC and other
media profiles
Technologies de l'information — Format pour application multimédia
(MPEG-A) —
Partie 19: Format CMAF (Common Media Application Format) pour
médias segmentés
AMENDEMENT 2: XHE-AAC et autres profils médias
Reference number
ISO/IEC 23000-19:2018/Amd.2:2019(E)
©
ISO/IEC 2019
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ISO/IEC 23000-19:2018/Amd.2:2019(E)
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ISO/IEC 23000-19:2018/Amd.2:2019(E)
Foreword
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This document was prepared by Technical Committee ISO/IEC JTC 1, Information technology,
Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information.
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© ISO/IEC 2019 – All rights reserved iii
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ISO/IEC 23000-19:2018/Amd.2:2019(E)
Information technology — Multimedia application format
(MPEG-A) —
Part 19:
Common media application format (CMAF) for
segmented media
AMENDMENT 2: XHE-AAC and other media profiles
Clause 2
Add the following new normative references.
ISO/IEC 23003-3:2012, Information technology — MPEG audio technologies — Part 3: Unified speech and
audio coding
IETF RFC 6381, The 'Codecs' and 'Profiles' Parameters for "Bucket" Media Types, August 2011.
3.2
Add a new term and definition at the end of subclause 3.2.
3.2.10
CMAF supplemental data
data that can be present in a CMAF track (3.2.1) and its contained media samples (3.3.15) conformant to
a set of requirements identified by a brand
Clause 5
Add new paragraphs at the end of Clause 5.
Annex K specifies the CMAF media profile for MPEG-D USAC.
Annex L specifies the CMAF media profile for IMSC 1.1.
6.5.5
In subclause 6.5.5.1, replace the first bullet in the list with the following.
— CMAF specifies CMAF media profiles, CMAF supplemental data, and ISOBMFF brands for widely
used audio, video, and subtitle formats. Each CMAF media profile specifies constraints on codecs,
media samples, CMAF fragments, and CMAF tracks to identify encoder/decoder interoperability
and optional functionality including random access and seamless adaptive switching specified as
CMAF switching set constraints. CMAF also specifies guidelines for the specification of CMAF media
profiles and matching brands to enable other specifications to define CMAF media profiles that
conform to general CMAF requirements. See Table A.1, Table B.1, Table A.2, and Table A.3.
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ISO/IEC 23000-19:2018/Amd.2:2019(E)
Add a new subclause 6.5.5.4 and renumber the subsequent subclauses in 6.5.5.
6.5.5.4 Signalling of supplemental data in CMAF tracks
CMAF defines brands, called "supplemental data brands" to identify the presence of additional
information in a CMAF track that is not required by the CMAF media profile of that track. For example,
NAL units, SEI messages, ISOBMFF Boxes can be added to an otherwise conformant CMAF track
file, where this supplemental data does not make the CMAF track file non-conformant. Signalling its
presence may be useful during production workflow, and to decoders for track selection and decoder
initialization.
In 6.5.5.6, replace the second bullet in the list with the following.
— CMAF media profiles and CMAF supplemental data are specified in A.2, A.3, A.4, and B.5.
7.3.5
Delete the NOTE.
9.3.5.2
Replace the first paragraph of subclause 9.3.5.2 with the following.
CTA 608/708 caption data (CTA-608-E, CTA-708-E) may be stored in video SEI messages defined by the
associated video codec specification (see 11.4). Video embedded captions are not considered a CMAF
subtitle track, and it is expected that many CMAF compatible players will ignore these messages in video
CMAF tracks. The presence of CTA 608/708 caption data in such SEI messages is CMAF supplemental
data and should be indicated by the addition of the 'ccea' compatibility brand in the CMAF header, as
specified in A.4.
10.1
Add the following bullet to the end of the list.
— see Annex K for MPEG-D USAC.
11.1
Add the following text to the end of subclause 11.1.
An additional CMAF media profile for IMSC 1.1 is defined in Annex L.
11.3.1
Replace the text of Clause 11.3.1 with the following.
W3C IMSC1 and W3C IMSC1.1 are profiles of the timed text markup language (TTML) for subtitle and
caption delivery. W3C IMSC1 defines a text-only profile and an image-only profile. W3C IMSC1.1 also
defines a text-only profile and an image-only profile. W3C IMSC1.1 is a superset of W3C IMSC1, such
that a valid W3C IMSC1 text or image profile document is a valid W3C IMSC1.1 text or image profile
document, respectively.
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ISO/IEC 23000-19:2018/Amd.2:2019(E)
An IMSC1 Text track is a CMAF track that conforms to the provisions of subclauses 11.3.2 and 11.3.3.
An IMSC1 Image track is a CMAF track that conforms to the provisions of subclauses 11.3.2 and 11.3.4.
An IMSC1.1 text track is a CMAF track that conforms to the provisions of subclauses 11.3.2 and L.2.
An IMSC1.1 image track is a CMAF track that conforms to the provisions of subclauses 11.3.2 and L.3.
11.3.2
Replace subclause 11.3.2 with the following.
The CMAF track shall conform to ISO/IEC 14496-30.
The namespace field of the XMLSubtitleSampleEntry box shall contain one instance of the string
“http://www.w3.org/ns/ttml”.
NOTE The schema_location field of the XMLSubtitleSampleEntry box is not expected to be set for
the purpose of profile signalling. The CMAF media profile brand can be used to determine the profile.
The XMLSubtitleSampleEntry shall contain a MIMEBox as specified in ISO/IEC 14496-12 and its
content_type field shall be constrained as follows.
— The type shall be "application".
— The subtype shall be "ttml+xml".
— The codecs parameter shall be present and set according to 11.3.3 and 11.3.4.
The media type of the CMAF track, as specified in RFC
...
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