ISO/IEC 23094-4:2022 PDF

Information technology — General video coding — Part 4: Conformance and reference software for essential video coding

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Title (English):

ISO/IEC 23094-4:2022

Information technology — General video coding — Part 4: Conformance and reference software for essential video coding

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 32
Publication date:: February 8, 2022
Edition:: ISO/IEC IS 23094 edition 1 version 1
ICS:: 35.040.40

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Description (English):

This document specifies a set of tests and procedures designed to indicate whether encoders or decoders essential video coding (EVC), which contains tests and a reference software designed to verify whether bitstreams and decoders meet normative requirements specified in ISO/IEC 23094-1. An encoder can claim conformance to ISO/IEC 23094-1 if the bitstreams that it generates are conforming bitstreams. Characteristics of coded bitstreams and decoders are defined in ISO/IEC 23094-1. Decoder characteristics define the properties and capabilities of the applied decoding process. The capabilities of a decoder specify which bitstreams the decoder can decode and reconstruct. A bitstream can be decoded by a decoder if the characteristics of the bitstream are within the specified decoder capabilities.

Technical details

Technical committee: ISO/IEC JTC 1/SC 29 - Coding of audio, picture, multimedia and hypermedia information
SKU: ISO/IEC 23094-4:2022

Abstract

Overview

ISO/IEC 23094-4:2022 - "Information technology - General video coding - Part 4: Conformance and reference software for essential video coding" defines the conformance test methods and reference software for Essential Video Coding (EVC). The standard specifies the tests, bitstream test suites and a reference software decoder/encoder intended to verify whether bitstreams and decoders meet the normative requirements given in ISO/IEC 23094-1:2020. It establishes how to determine if an encoder’s output is a conforming bitstream and whether a decoder’s capabilities match the profiles and levels defined for EVC.

Key topics and requirements

Bitstream conformance
- Use of the reference software decoder to check that candidate bitstreams do not trigger errors or non-conformance messages.
- Parsing full bitstreams and validating syntax elements; complementary verification may be required for HRD-related constraints (Annexes C, D, E).
Decoder conformance
- Two conformance classes: output order conformance (decoded pictures and sample values match reference) and output timing conformance (decoded samples produced at the rates and times specified in Annex C of ISO/IEC 23094‑1).
- Decoder capabilities specify which bitstreams a decoder must be able to decode and reconstruct.
Test artifacts and procedure
- Conformance bitstream packages (electronic annex) contain: bitstream, decoded pictures or hashes, short description, and trace files.
- Static tests (sample-value comparison or hashes) and dynamic tests (timing, HRD - CPB/DPB verification).
- Recommendations for robust decoder behavior (e.g., recovery after bitstream loss, concealment).
Reference software and ETM
- Reference encoder/decoder usage and an ETM (test model of EVC) repository are described for reproducible testing.

Practical applications and users

Codec developers and encoder vendors use ISO/IEC 23094-4 to validate that encoded bitstreams conform to EVC profiles and levels.
Decoder implementers and silicon vendors apply the tests to demonstrate output order and timing conformance, and HRD compliance.
Test laboratories and certification bodies run the supplied test suites and reference software for compliance verification.
System integrators and streaming platform engineers rely on conformance testing to ensure interoperability between encoders, network delivery, and decoders.

Related standards

ISO/IEC 23094-1:2020 - Essential video coding (syntax, semantics, decoder model)
Normative references in ISO/IEC 23094-4 include programming and interface standards such as ISO/IEC 9899 (C) and POSIX (ISO/IEC/IEEE 9945) for reference software portability.

For test materials and electronic annex: https://standards.iso.org/iso-iec/23094/-4/ed-1/en/

Related standards

Standards mentioned in the description

Abstract

Overview

Key topics and requirements

Bitstream conformance
- Use of the reference software decoder to check that candidate bitstreams do not trigger errors or non-conformance messages.
- Parsing full bitstreams and validating syntax elements; complementary verification may be required for HRD-related constraints (Annexes C, D, E).
Decoder conformance
- Two conformance classes: output order conformance (decoded pictures and sample values match reference) and output timing conformance (decoded samples produced at the rates and times specified in Annex C of ISO/IEC 23094‑1).
- Decoder capabilities specify which bitstreams a decoder must be able to decode and reconstruct.
Test artifacts and procedure
- Conformance bitstream packages (electronic annex) contain: bitstream, decoded pictures or hashes, short description, and trace files.
- Static tests (sample-value comparison or hashes) and dynamic tests (timing, HRD - CPB/DPB verification).
- Recommendations for robust decoder behavior (e.g., recovery after bitstream loss, concealment).
Reference software and ETM
- Reference encoder/decoder usage and an ETM (test model of EVC) repository are described for reproducible testing.

Practical applications and users

Codec developers and encoder vendors use ISO/IEC 23094-4 to validate that encoded bitstreams conform to EVC profiles and levels.
Decoder implementers and silicon vendors apply the tests to demonstrate output order and timing conformance, and HRD compliance.
Test laboratories and certification bodies run the supplied test suites and reference software for compliance verification.
System integrators and streaming platform engineers rely on conformance testing to ensure interoperability between encoders, network delivery, and decoders.

Related standards

ISO/IEC 23094-1:2020 - Essential video coding (syntax, semantics, decoder model)
Normative references in ISO/IEC 23094-4 include programming and interface standards such as ISO/IEC 9899 (C) and POSIX (ISO/IEC/IEEE 9945) for reference software portability.

For test materials and electronic annex: https://standards.iso.org/iso-iec/23094/-4/ed-1/en/

ISO/IEC 23094-4:2022 PDF

Technical details

Abstract

Overview

Key topics and requirements

Practical applications and users

Related standards

Related standards

Abstract

Overview

Key topics and requirements

Practical applications and users

Related standards

Related standards

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