ISO/IEC 23001-11:2019
Information technology — MPEG systems technologies — Part 11: Energy-efficient media consumption (green metadata)
This document specifies metadata for energy-efficient decoding, encoding, presentation and selection of media.
The metadata for energy-efficient decoding specifies two sets of information: complexity metrics (CM) metadata and decoding operation reduction request (DOR-Req) metadata. A decoder uses CM metadata to vary operating frequency and thus reduce decoder power consumption. In a point-to-point video conferencing application, the remote encoder uses the DOR-Req metadata to modify the decoding complexity of the bitstream and thus reduce local decoder power consumption.
The metadata for energy-efficient encoding specifies a quality metric that is used by a decoder to reduce the quality loss from low-power encoding.
The metadata for energy-efficient presentation specifies RGB-component statistics and quality levels. A presentation subsystem uses this metadata to reduce power by adjusting display parameters, based on the statistics, to provide a desired quality level from those provided in the metadata.
The metadata for energy-efficient media selection specifies decoder operation reduction ratios (DOR-Ratios), RGB-component statistics and quality levels. The client in an adaptive streaming session uses this metadata to determine decoder and display power-saving characteristics of available video representations and to select the representation with the optimal quality for a given power-saving.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions, symbols, abbreviated terms and conventions
3.1 Terms and definitions
3.2 Symbols and abbreviated terms
3.3 Conventions
3.3.1 Arithmetic operators
3.3.2 Mathematical functions
4 Functional architecture
4.1 Description of the functional architecture
4.2 Definition of components in the functional architecture
5 Decoder power reduction
5.1 General
5.2 Complexity metrics for decoder-power reduction
5.2.1 General
5.2.2 Syntax
5.2.3 Signalling
5.2.4 Semantics
5.3 Interactive signalling for remote decoder-power reduction
5.3.1 General
5.3.2 Syntax
5.3.3 Signalling
5.3.4 Semantics
6 Display power reduction using display adaptation
6.1 General
6.2 Syntax
6.2.1 Systems without a signalling mechanism from the receiver to the transmitter
6.2.2 Systems with a signalling mechanism from the receiver to the transmitter
6.3 Signalling
6.3.1 General
6.3.2 Systems without a signalling mechanism from the receiver to the transmitter
6.3.3 Systems with a signalling mechanism from the receiver to the transmitter
6.4 Semantics
7 Energy-efficient media selection
7.1 General
7.2 Syntax
7.3 Signalling
7.4 Semantics
7.4.1 Decoder-power indication metadata semantics
7.4.2 Display-power indication metadata semantics
8 Metrics for quality recovery after low-power encoding
8.1 General
8.2 Syntax
8.3 Signalling
8.4 Semantics
9 Conformance and reference software
Annex A (normative) Supplemental enhancement information (SEI) syntax
Annex B (informative) Implementation guidelines for the usage of green metadata
Annex C (normative) Conformance and reference software
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions, symbols, abbreviated terms and conventions
3.1 Terms and definitions
3.2 Symbols and abbreviated terms
3.3 Conventions
3.3.1 Arithmetic operators
3.3.2 Mathematical functions
4 Functional architecture
4.1 Description of the functional architecture
4.2 Definition of components in the functional architecture
5 Decoder power reduction
5.1 General
5.2 Complexity metrics for decoder-power reduction
5.2.1 General
5.2.2 Syntax
5.2.3 Signalling
5.2.4 Semantics
5.3 Interactive signalling for remote decoder-power reduction
5.3.1 General
5.3.2 Syntax
5.3.3 Signalling
5.3.4 Semantics
6 Display power reduction using display adaptation
6.1 General
6.2 Syntax
6.2.1 Systems without a signalling mechanism from the receiver to the transmitter
6.2.2 Systems with a signalling mechanism from the receiver to the transmitter
6.3 Signalling
6.3.1 General
6.3.2 Systems without a signalling mechanism from the receiver to the transmitter
6.3.3 Systems with a signalling mechanism from the receiver to the transmitter
6.4 Semantics
7 Energy-efficient media selection
7.1 General
7.2 Syntax
7.3 Signalling
7.4 Semantics
7.4.1 Decoder-power indication metadata semantics
7.4.2 Display-power indication metadata semantics
8 Metrics for quality recovery after low-power encoding
8.1 General
8.2 Syntax
8.3 Signalling
8.4 Semantics
9 Conformance and reference software
Annex A (normative) Supplemental enhancement information (SEI) syntax
Annex B (informative) Implementation guidelines for the usage of green metadata
Annex C (normative) Conformance and reference software
Bibliography