ISO/IEC 23001-10:2020/Amd 2:2025

International
Standard
ISO/IEC 23001-10
Second edition
Information technology — MPEG
2020-04
systems technologies —
AMENDMENT 2
Part 10:
2025-10
Carriage of timed metadata
metrics of media in ISO base media
file format
AMENDMENT 2: Support for display
attenuation map
Reference number
ISO/IEC 23001-10:2020/Amd. 2:2025(en) © ISO/IEC 2025

ISO/IEC 23001-10:2020/Amd. 2:2025(en)
© ISO/IEC 2025
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
© ISO/IEC 2025 – All rights reserved
ii
ISO/IEC 23001-10:2020/Amd. 2:2025(en)
Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are
members of ISO or IEC participate in the development of International Standards through technical
committees established by the respective organization to deal with particular fields of technical activity.
ISO and IEC technical committees collaborate in fields of mutual interest. Other international organizations,
governmental and non-governmental, in liaison with ISO and IEC, also take part in the work.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of document should be noted. This document was drafted in accordance with the editorial rules of the ISO/
IEC Directives, Part 2 (see www.iso.org/directives or www.iec.ch/members_experts/refdocs).
ISO and IEC draw attention to the possibility that the implementation of this document may involve the
use of (a) patent(s). ISO and IEC take no position concerning the evidence, validity or applicability of any
claimed patent rights in respect thereof. As of the date of publication of this document, ISO and IEC had not
received notice of (a) patent(s) which may be required to implement this document. However, implementers
are cautioned that this may not represent the latest information, which may be obtained from the patent
database available at www.iso.org/patents and https://patents.iec.ch. ISO and IEC shall not be held
responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www.iso.org/iso/foreword.html.
In the IEC, see www.iec.ch/understanding-standards.
This document was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology,
Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information.
A list of all parts in the ISO/IEC 23001 series can be found on the ISO and IEC websites.
Any feedback or questions on this document should be directed to the user’s national standards
body. A complete listing of these bodies can be found at www.iso.org/members.html and
www.iec.ch/national-committees.

© ISO/IEC 2025 – All rights reserved
iii
ISO/IEC 23001-10:2020/Amd. 2:2025(en)
Information technology — MPEG systems technologies —
Part 10:
Carriage of timed metadata metrics of media in ISO base
media file format
AMENDMENT 2: Support for display attenuation map

Clause 2
Add the following reference at the end of the clause:
ISO/IEC 14496-15:2022, Information technology — Coding of audio-visual objects — Part 15: Carriage of
network abstraction layer (NAL) unit structured video in the ISO base media file format

Clause 5
Add the following subclauses at the end of the clause:

5.4  Display attenuation map metadata
5.4.1  General
A display attenuation map video is a 2D video where each frame conveys pixel-wise information that can be
applied to a corresponding frame in the original video sequence through a processing operation to reduce
the total energy consumption resulting from rendering the frames of that video.
5.4.2  Attenuation map information box
5.4.2.1  Definition
An AttenuationMapInformationBox contains information about the characteristics of the display attenuation
map data stream carried by the track in which it is signalled. It is identified by the 4CC ‘amid’. The information
in the payload of the track may include pre-processing operations that should be applied to the samples of
the display attenuation map as well as other information that can distinguish one display attenuation map
track from another for the same content, which enables a player to select the most suitable track based on its
energy reduction strategy.
5.4.2.2.  Syntax
aligned(8) class AMIApproximationModel() {
bit(4) reserved = 0;
unsigned int(4) ami_map_approx_model;
}
aligned(8) class AMIWindowInfo() {
unsigned int(8) ami_window_x;
unsigned int(8) ami_window_y;
unsigned int(8) ami_window_width;

© ISO/IEC 2025 – All rights reserved
ISO/IEC 23001-10:2020/Amd. 2:2025(en)
unsigned int(8) ami_window_height;
}
aligned(8) class AMIVideoQualityInfo() {
bit(5) reserved = 0;
unsigned int(3) ami_quality_metric;
unsigned int(8) ami_quality_reduction;
}
aligned(8) class AMIPreprocessingInfo() {
bit(6) reserved = 0;
unsigned int(2) ami_preprocessing_type;
unsigned int(8) ami_max_value;
unsigned int(8) ami_preprocessing_scale;
}
aligned(8) class AttenuationMapInformationBox() extends FullBox('amid', version = 0, flags) {

bit(3) reserved = 0;
unsigned int(1) ami_preprocessing_info_present_flag;
unsigned int(1) ami_approx_model_present_flag;
unsigned int(1) ami_window_info_present_flag;
unsigned int(1) ami_video_quality_info_present_flag;

unsigned int(5) ami_energy_reduction_rate;
unsigned int(4) ami_display_model;
unsigned int(4) ami_attenuation_use_idc;
unsigned int(4) ami_attenuation_component_idc;

if (ami_preprocessing_info_present_flag) {
AMIPreprocessingInfo();
}
if (ami_approx_model_present_flag) {
AMIApproximationModel();
}
if (ami_window_info_present_flag) {
AMIWindowInfo();
}
if (ami_video_quality_info_present_flag) {
AMIVideoQualityInfo();
}
}
5.4.2.3  Semantics
The semantics of the fields defined in AttenuationMapInformationBox are as follows:
ami_preprocessing_info_present_flag is a flag indicating whether preprocessing information is present.
Value 1 indicates that the box contains preprocessing information.
ami_approx_model_present_flag is a flag indicating whether approximation model information is present.
Value 1 indicates that the box contains approximation model information.
ami_window_info_present_flag is a flag indicating whether window information is present. Value 1 indicates
that the box contains window information.

© ISO/IEC 2025 – All rights reserved
ISO/IEC 23001-10:2020/Amd. 2:2025(en)
ami_video_quality_info_present_flag is a flag indicating whether video quality information is present.
Value 1 indicates that the box contains video quality information.
ami_energy_reduction_rate indicates the expected energy saving rate (percentage) when the video
is displayed after applying the display attenuation map sample values on the sample values of the
associated video.
ami_display_model indicates the display models on which the display attenuation map sample values may
be used. The semantics of the bits of this field are described in Table 1.

Table 1 — Semantics of the bits of the ami_display_model field
Bit number Display model
0 Transmissive pixel
1 Emissive pixel
2 . 3 Reserved for future use

ami_attenuation_use_idc indicates which operation shall be used to
...