ISO/IEC 21122-3:2024

Name: ISO/IEC 21122-3:2024 — Information technology — JPEG XS low-latency lightweight image coding system — Part 3: Transport and container formats
SKU: ISO/IEC 21122-3:2024
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Information technology — JPEG XS low-latency lightweight image coding system — Part 3: Transport and container formats

Название (английский):

Information technology — JPEG XS low-latency lightweight image coding system — Part 3: Transport and container formats

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 49
Дата публикации:: 16 августа 2024 г.
Издание:: ISO/IEC IS 21122 edition 3 version 1
ICS:: 35.040.30

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Описание (английский):

This document defines transport and container formats for JPEG XS codestreams as specified in ISO/IEC 21122-1. It defines file formats for working with still image and motion image sequence files on computer platforms and gives guidance on how to embed the codestream in transport streams, allowing internet-based communication. This document uses already existing specifications for file formats and extends them for the embedding of JPEG XS codestreams.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO/IEC 21122-3:2024 specifies transport and container formats for JPEG XS codestreams (as defined in ISO/IEC 21122-1). It defines file formats and embedding rules for working with still images (JXS) and motion image sequences on computer platforms, and gives guidance for embedding JPEG XS codestreams in transport streams for internet-based communication. The third edition adds support for temporal differential coding (TDC) and clarifies handling of interlaced signals.

Key topics and requirements

Container and transport definitions

Specifies how to wrap JPEG XS codestreams in file containers and transport streams using box/superbox structures.
Extends existing file-format specifications to support embedding of JPEG XS codestreams.

File formats

Normative guidance for a JXS still-image file format (Annex B).
Integration into ISO Base Media File Format (ISOBMFF) for motion sequences (Annex C).
Integration into HEIF for combined still and motion workflows (Annex D).

Metadata and signalling

Defines metadata boxes to signal colourspace, timing, presentation and other image properties; ensures proper interpretation and presentation.
Uses coding-independent code points (CICP) and references Rec. ITU‑T H.273 / ISO/IEC 23091-2 for colour specification.

Transport and internet use

Guidance on embedding codestreams in transport streams to enable low-latency internet communication and editing workflows.

Conformance rules

Readers must ignore unrecognized boxes; Annex A provides the common syntax elements and box definitions used throughout.

Practical performance targets

Addresses JPEG XS use cases where low latency and robustness under multiple recompression cycles matter; typical visually lossless compression ratios ~2:1 to 20:1 and end-to-end latency can be a fraction of a frame.

Applications

Live production and broadcast workflows requiring low-latency, low-complexity image transport.

Real-time video contribution, remote production, and editing systems where recompression robustness and minimal latency are critical.

File-based storage and interchange of JPEG XS stills and movies in media asset management, archiving, and cloud workflows.

Web and internet streaming scenarios needing efficient embedding of JPEG XS in transport streams.

Who should use this standard

Systems integrators, codec implementers, and software developers building JPEG XS encoders/decoders and muxers.

Broadcast engineers, live-production vendors, media-asset managers, and OTT platform architects.

Standards and compliance teams ensuring interoperability of JPEG XS media files and transport streams.

Related standards

ISO/IEC 21122-1 (JPEG XS core coding system)

ISO/IEC 21122-2 (Profiles and buffer models)

ISO/IEC 14496-12 (ISOBMFF)

ISO/IEC 23008-12 (HEIF)

Rec. ITU‑T H.273 | ISO/IEC 23091-2 (coding-independent code points / colourspaces)

Keywords: JPEG XS, low-latency, transport and container formats, JXS, ISOBMFF, HEIF, codestream, metadata, temporal differential coding, interlaced signals.

ISO/IEC 21122-3:2024

Abstract

Похожие стандарты

Overview

Key topics and requirements

Applications

Who should use this standard

Related standards

Технические детали

ISO/IEC 21122-1:2024

Information technology — JPEG XS low-latency lightweight image coding system — Part 1: Core coding system

ISO/IEC 23091-2:2025

Information technology — Coding-independent code points — Part 2: Video

ISO/IEC 21122-2:2024

Information technology — JPEG XS low-latency lightweight image coding system — Part 2: Profiles and buffer mo…

BS EN ISO/IEC 14496-12/AMD1

ISO/IEC 14496-12.2/DAmd 1 Information technology. Coding of audio-visual objects.. Part 12: ISO base media fi…

ISO/IEC 23008-12:2025/Amd 1:2025

Information technology — High efficiency coding and media delivery in heterogeneous environments — Part 12: I…