Overview
ISO/IEC 23091-1:2018, titled Information technology - Coding-independent code points - Part 1: Systems, is a key international standard published by ISO and IEC. This standard defines coding-independent code points for multimedia systems, establishing properties of multimedia streams that are independent of compression encoding and bit rate. The primary purpose is to create a universal, compression-agnostic framework to describe multimedia characteristics-both before encoding and after decoding-enhancing interoperability and consistency across different multimedia technologies.
By providing a centralized, standardized set of systems code points, ISO/IEC 23091-1 addresses common challenges such as conflicting assignments, fragmented specifications, and maintenance difficulties encountered when defining multimedia stream properties across various documents. The standard also specifies a Uniform Resource Name (URN) format to uniquely reference these code points across all parts of the ISO/IEC 23091 series.
Key Topics
- Coding-independent code points: These code points describe multimedia signal properties independent of specific compression schemes or bit rates, enabling broad applicability across multimedia systems.
- Applications to systems properties: The code points cover characteristics relevant to the multimedia system level, distinct from audio and video specifics handled in other parts of the series.
- URN format for code points: The standard defines a URN namespace prefix
urn:mpeg:mpegB:cicp: to uniquely identify code points, facilitating consistent referencing and usage.
- Code point definition principles: Guidance on encoding, value ranges, default values, and integration with external specifications to ensure seamless adoption in different technical environments.
- Centralized code point management: Consolidates definitions to prevent conflicts and promote easier updates compared to previous fragmented approaches.
Applications
ISO/IEC 23091-1:2018 is highly beneficial in scenarios requiring interoperability between diverse multimedia technologies, including:
- Multimedia streaming services: Defining universal descriptors for streams irrespective of the underlying compression codec or bit rate.
- Media container formats and delivery systems: Standardizing the interpretation of signals enables better handling, transcoding, or rendering by various playback and distribution platforms.
- Encoding and decoding solutions: Describing input signal properties prior to encoding and the characteristics of decoded streams, ensuring compatibility across systems and devices.
- Content metadata specification: Facilitating embedding of coding-independent descriptors in multimedia metadata, enhancing content management and discovery.
- Standards development and integration: Serving as a reference framework for new or evolving multimedia standards requiring common terminology and descriptions.
Related Standards
ISO/IEC 23091-1:2018 forms Part 1 of the ISO/IEC 23091 series, which collectively addresses coding-independent code points across multimedia domains:
- ISO/IEC 23091-2: Focuses on video-specific code points (currently under preparation).
- ISO/IEC 23091-3: Addresses audio-specific code points.
- The predecessor, ISO/IEC 23001-8:2016, which this standard supersedes and revises.
- IETF RFC 8141: Defines Uniform Resource Names (URNs), which ISO/IEC 23091-1 utilizes for consistent code point identification.
By aligning with these and other multimedia and IT standards, ISO/IEC 23091-1 supports robust, standard-compliant multimedia system development and deployment.
Keywords: ISO/IEC 23091-1, coding-independent code points, multimedia systems, multimedia stream properties, URN format, ISO multimedia standards, multimedia interoperability, encoding-independent descriptors, compression-independent multimedia, multimedia metadata standards.
