ISO/IEC 23000-19:2020

Information technology — Multimedia application format (MPEG-A) — Part 19: Common media application format (CMAF) for segmented media

This document specifies the CMAF multimedia format, which contains segmented media objects optimized for streaming delivery and decoding on end user devices in adaptive multimedia presentations. CMAF specifies a track format derived from the ISO base media file format, then derives addressable media objects from CMAF tracks that can be used for storage and delivery. CMAF specifies sets of tracks that share encoding and packaging constraints that enable the selection of multiple tracks to form a multimedia presentation and allow seamless switching of alternative encodings of the same content at different bit rates, frame rates, resolution, etc. CMAF specifies a hypothetical application model that determines how tracks in a CMAF presentation are intended to be combined and synchronized to form a multimedia presentation. The model abstracts delivery to allow any delivery method. The hypothetical application model assumes a manifest and player, but CMAF does not specify a manifest, player, or delivery protocol, with the intent that any that support the hypothetical application model can be used. CMAF specifies media profiles and brands that constrain media encoding and packaging of CMAF tracks to enable seamless adaptive switching of tracks and allow devices to identify compatible content by its brand. CMAF specifies presentation profiles that conditionally require sets of CMAF tracks conforming to specified media profiles and allow content creators and devices to identify compatible multimedia presentations. CMAF enables extensibility by specifying how new media profiles and presentation profiles can be specified and identified and includes guidelines for those specifications.

Technologies de l'information — Format pour application multimédia (MPEG-A) — Partie 19: Format CMAF (Common Media Application Format) pour médias segmentés

General Information

• Status: Withdrawn
• Publication Date: 18-Mar-2020
• ICS: 35.040.40 - Coding of audio, video, multimedia and hypermedia information
• Technical Committee: ISO/IEC JTC 1/SC 29 - Coding of audio, picture, multimedia and hypermedia information
• Drafting Committee: ISO/IEC JTC 1/SC 29 - Coding of audio, picture, multimedia and hypermedia information
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 29-Feb-2024

Relations

• Amended By: ISO/IEC 23000-19:2020/Amd 1:2021 - Information technology — Multimedia application format (MPEG-A) — Part 19: Common media application format (CMAF) for segmented media — Amendment 1: Additional CMAF HEVC media profiles
• Effective Date: 08-May-2021
• Revised: ISO/IEC 23000-19:2024 - Information technology — Multimedia application format (MPEG-A) — Part 19: Common media application format (CMAF) for segmented media
• Effective Date: 17-Sep-2022
• Revises: ISO/IEC 23000-19:2018/Amd 1:2018 - Information technology — Multimedia application format (MPEG-A) — Part 19: Common media application format (CMAF) for segmented media — Amendment 1: SHVC media profile and additional audio media profiles
• Effective Date: 23-Apr-2020
• Revises: ISO/IEC 23000-19:2018/Amd 2:2019 - 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
• Effective Date: 23-Apr-2020
• Revises: ISO/IEC 23000-19:2018 - Information technology — Multimedia application format (MPEG-A) — Part 19: Common media application format (CMAF) for segmented media
• Effective Date: 23-Apr-2020

Standards Content (Sample)

INTERNATIONAL ISO/IEC
STANDARD 23000-19
Second edition
2020-03
Information technology — Multimedia
application format (MPEG-A) —
Part 19:
Common media application format
(CMAF) for segmented media
Technologies de l'information — Format pour application multimédia
(MPEG-A) —
Partie 19: Format CMAF (Common Media Application Format) pour
médias segmentés
Reference number
ISO/IEC 23000-19:2020(E)
©
ISO/IEC 2020

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ISO/IEC 23000-19:2020(E)

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ISO/IEC 23000-19:2020(E)

Contents Page
Foreword .vii
Introduction .viii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
3.1 Media objects . 3
3.2 Logical structure . 3
3.3 Application model . 4
4 Abbreviated terms . 6
5 Document organization . 8
6 CMAF hypothetical application model, media object model and profiles .10
6.1 Overview of the hypothetical application model and media object model .10
6.2 CMAF content processing model .11
6.3 Late binding CMAF track synchronization .12
6.4 Adaptive switching of CMAF tracks in CMAF switching sets .13
6.5 CMAF specified objects and profiles.14
6.5.1 Object derivation and interoperability code points .14
6.5.2 Encoded media objects . .14
6.5.3 Logical media object sets .14
6.5.4 Addressable media objects .
...