Overview
ISO/IEC 23090-24:2025 is an international standard developed by ISO and IEC, focusing on the coded representation of immersive media. Specifically, this part of the standard provides the conformance and reference software for scene description, as defined in ISO/IEC 23090-14. By establishing an interoperable framework, it ensures reliable testing, validation, and implementation of immersive media scene descriptions, supporting advancements in virtual reality (VR), augmented reality (AR), and mixed reality (MR) experiences.
This standard is integral to the MPEG-I suite, enabling industry stakeholders to verify compliance and integrate new features in multimedia and immersive content applications. With a strong focus on scene description interoperability, the reference software and conformance tools defined in ISO/IEC 23090-24:2025 facilitate robust multimedia workflow development.
Key Topics
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Reference Software for Scene Description
The standard provides a standalone Python module called pympegsd, offering a reference implementation for MPEG-I scene description extensions, as specified in ISO/IEC 23090-14. This module supports several extensions for timed media, video textures, spatial audio, mesh linking, and more.
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Conformance Testing Tools
ISO/IEC 23090-24 includes software tools for validating scene descriptions against the ISO/IEC 23090-14 specification. These tools verify JSON schema conformance, binary buffer accuracy, metadata carriage, and audio/image stream integrity based on defined MPEG extensions.
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Extension Support
Key MPEG-specific extensions handled include:
- MPEG_media: referencing external media
- MPEG_texture_video: video textures
- MPEG_audio_spatial: spatial audio integration
- MPEG_buffer_circular: circular buffers for timed media
- MPEG_mesh_linking: mesh mapping and linking
- Haptics and AR scene playback support
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Software Integration and Dependencies
The reference software is designed with modular dependencies, leveraging Python libraries such as trimesh, pyglet, and networkx, as well as interfacing with spatial audio renderers and the OpenXR framework for immersive rendering.
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Validator and Carriage Libraries
Tools like the MPEG glTF-validator and libSDCarriage ensure that both the scene description syntax and binary data comply with the required standards.
Applications
ISO/IEC 23090-24:2025 supports practical use cases in a broad range of immersive media and information technology domains, including:
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Interactive and Immersive Media Experiences
Enables production and validation of VR, AR, and MR applications by ensuring scene descriptions are standardized and interoperable.
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3D Asset Pipelines
Integrates with glTF 2.0 (ISO/IEC 12113), supporting efficient runtime delivery and validation of 3D assets in multimedia systems.
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Media System Development
Facilitates test scenario creation and new feature prototyping for developers working with scene description in immersive environments.
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Validation and Testing Environments
Used to automatically validate files and bitstreams-such as MPEG Immersive Video (MIV)-to guarantee fidelity with industry standards and expected rendering processes.
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Research and Standards Conformance
Offers a reference implementation for academic, research, or vendor-oriented evaluation of new features and conformance tests.
Related Standards
Organizations and professionals implementing ISO/IEC 23090-24:2025 may also reference:
- ISO/IEC 23090-14: Defines the underlying scene description framework and extension mechanisms.
- ISO/IEC 12113: Specifies the Khronos glTF 2.0 format for runtime 3D asset delivery.
- ISO/IEC 21778: Sets out the JSON data interchange syntax used in scene description extensions.
- glTF-Validator: Open-source tool from the Khronos Group for glTF 2.0 validation.
- OpenXR: Cross-platform XR framework for immersive device compatibility.
- MPEG Immersive Video (MIV): Standards for immersive video content delivery and playback.
Visit the ISO official website for further details and access to the complete standards catalogue.
Keywords: immersive media, scene description, MPEG-I, ISO/IEC 23090-24:2025, conformance software, reference software, glTF, virtual reality, augmented reality, multimedia standards, MPEG extensions, spatial audio, haptics, reference implementation