Overview
ISO/IEC 23001-11:2023/Amd 1:2024 is an important amendment to the third edition of the international standard focusing on energy-efficient media consumption, a subfield of MPEG systems technologies. This standard specifically expands the definition and implementation of green metadata to support the EVC (Essential Video Coding) codec in addition to previously supported codecs like AVC, HEVC, and VVC. By providing detailed complexity metrics related to decoding processes, this amendment aims to enhance energy efficiency during media playback, preserving resources and minimizing the environmental impact of digital video consumption.
Key Topics
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Green Metadata for Energy Efficiency
The amendment defines green metadata intended to convey picture-decoding complexity for EVC bitstreams. These complexity metrics allow decoders to optimize resource usage by adjusting decoding complexity based on the metadata.
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Functional Architecture Updates
The green-metadata generator component now provides complexity metrics (CMs) for EVC streams alongside AVC, HEVC, and VVC, enabling consistent energy-efficient decoding strategies across these popular codecs.
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Complexity Metrics Syntax
A detailed syntax for encoding energy-related metadata for EVC streams is introduced, covering:
- Different period types for applying complexity metrics (e.g., single picture, multiple pictures, single slice, multiple slices)
- Count of coding units (CUs) at various sizes having non-zero transform coefficients
- Portion of samples requiring fractional sample interpolation
These metrics are presented in variable length syntax elements conditioned on compliance profiles and levels of the bitstream.
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EVC Semantics
The amendment explains distinctions between EVC Baseline and Main profiles concerning the syntax and semantics used to represent decoding complexity metrics. The syntax scales with picture size and coding unit dimensions, ensuring adaptability to different levels of EVC conformance.
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Level-Dependent Field Lengths
The length of syntax fields in the green metadata depends on level indicators, which represent constraints such as maximum picture size. This dynamic adjustment optimizes representation efficiency.
Applications
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Energy-Efficient Media Decoding
Media players and decoders using EVC can leverage green metadata to reduce power consumption by managing decoding complexity intelligently. This leads to longer battery life in mobile devices and lower operational costs in large-scale video delivery networks.
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Improved Streaming Efficiency
Streaming services can adopt this standard to provide metadata that informs client devices on the most energy-efficient way to decode video content without compromising quality.
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Green Technology Initiatives
This amendment supports global efforts to reduce the carbon footprint of digital media consumption by enabling technologies that promote sustainable video coding and decoding practices.
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Adaptive Media Systems
Devices and systems can use these green metadata signals to dynamically balance performance and energy usage based on device capabilities, network conditions, and user preferences.
Related Standards
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ISO/IEC 23001-11 (2023) - Energy-efficient media consumption (green metadata)
The base standard defining green metadata for AVC, HEVC, and VVC codecs before the extension to EVC.
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ISO/IEC 23001 Series - MPEG Systems Technologies
Covers system frameworks for multimedia content delivery, including synchronization and multiplexing.
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ISO/IEC 23008 Series - High Efficiency Video Coding (HEVC)
Relevant for understanding prior codec support before EVC enhancement.
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ISO/IEC 14496 Series (MPEG-4)
Contains numerous standards related to coding of audio, video, and multimedia information.
By implementing ISO/IEC 23001-11:2023/Amd 1:2024, multimedia technology providers, codec developers, and device manufacturers can contribute to energy-efficient media consumption that preserves resources while meeting high-quality streaming demands in a sustainable manner. This standard is an essential reference for stakeholders committed to green media technology and eco-friendly digital services.