ISO/IEC 23001-10:2020/Amd 1:2021

FINAL
ISO/IEC
AMENDMENT
DRAFT
23001-10:2020
FDAM 1
ISO/IEC JTC 1/SC 29
Information technology — MPEG
Secretariat: JISC
systems technologies —
Voting begins on:
2021-06-28
Part 10:
Voting terminates on:
Carriage of timed metadata metrics of
2021-08-23
media in ISO base media file format
AMENDMENT 1: Support for content-
guided transcoding and spatial
relationship of immersive media
Technologies de l'information — Technologies des systèmes MPEG —
Partie 10: Transport de métriques de métadonnées de temporisation
de supports au format de fichier de support en base ISO
AMENDEMENT 1
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/IEC 23001-10:2020/FDAM 1:2021(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
©
NATIONAL REGULATIONS. ISO/IEC 2021

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ISO/IEC 23001-10:2020/FDAM 1:2021(E)

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© ISO/IEC 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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Published in Switzerland
ii © ISO/IEC 2021 – All rights reserved

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ISO/IEC 23001-10:2020/FDAM 1:2021(E)

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
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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
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editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives or www .iec .ch/ members
_experts/ refdocs).
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rights. Details of any patent rights identified during the development of the document will be in the
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list of patent declarations received (see patents.iec.ch).
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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 2021 – All rights reserved iii

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ISO/IEC 23001-10:2020/FDAM 1:2021(E)
Information technology — MPEG systems technologies —
Part 10:
Carriage of timed metadata metrics of media in ISO base
media file format
AMENDMENT 1: Support for content-guided transcoding and
spatial relationship of immersive media

5.2.2
Replace:
“The decoder power indication metadata sample entry shall be as follows.“
with:
“The decoder-power indication metadata uses the following sample entry:“
Replace:
“The decoder-power indication sample shall conform to the following syntax:“
with:
“The decoder-power indication samples use the following syntax:“

5.3.2.2
Replace:
“Display power indication metadata shall use the following sample entry:
with:
“The display-power indication metadata uses the following sample entry:
Replace:
“The display power indication sample shall use the following syntax“
with:
“The decoder-power indication samples use the following syntax:“

5.3.3.2
Replace:
“The display fine control metadata sample entry shall store static metadata as follows.“
© ISO/IEC 2021 – All rights reserved 1

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ISO/IEC 23001-10:2020/FDAM 1:2021(E)

with:
“The display fine control metadata uses the following sample entry:“
Replace:
“The display fine control metadata sample shall use the following syntax:“
with:
“The display fine control metadata samples use the following syntax:“

Clause 6
Add new Clauses 7 and 8 at the end of Clause 6 as follows:

7  Carriage of timed-metadata for content-guided transcoding
7.1  General
The metadata provide metrics on the streams that may be produced by a transcoding task. The
metadata are encapsulated into timed-metadata tracks of ISOBMFF file. Two types of sample entry are
proposed to match two use-cases of content-guided transcoding. For an optimal usage of the metadata,
the metadata producer needs to be informed of the transcoding function that is used in the network.
The detailed description of the transcoding function is out of scope of this specification.
The timed metadata track is linked to the track it describes by means of a ‘cdsc’ (content describes)
track reference. The synchronisation of metadata when using CMAF standard is based on the same
timed-metadata tracks.
7.2  Recommended video format metadata
7.2.1  Definition
Sample Entry Type: 'rvrf'
Container: Sample Description Box ('stsd')
Mandatory: No
Quantity: 0 or 1
This metadata indicates the recommended video resolution and frame rate at different bitrates over
the sample duration.
7.2.2  Syntax
Recommended Video Format Metadata use the following sample entry:
class RecVideoFormatMetaDataSampleEntry()
   extends MetaDataSampleEntry ('rvrf') {
  RecVideoFormatConfigurationBox();
}
class Device () {
  unsigned int(5) device_class;
  unsigned int(3) reserved = 0;
  unsigned int(32) codec_type;
  unsigned int(8) codec_profile;
}
aligned(8) class RecVideoFormatConfigurationBox
   extends FullBox('rvfc', version = 0, flags = 0) {
  unsigned int(5) num_devices;
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ISO/IEC 23001-10:2020/FDAM 1:2021(E)

  unsigned int(3) reserved = 0;
  unsigned int(4) num_bitrates;
  unsigned int(3) reserved = 0;
  unsigned int(1) rate_ctl_type;
  unsigned int(8) max_peak_bitrate_var_from_avg;
  for (i = 1; i <= num_devices; i++) {
   Device dev[i];
  }
  for (i = 1; i <= num_bitrates; i++)
   unsigned int(16) bitrate[i];
}
The Recommended Video Format samples use the following syntax:
class VideoFormat () {
  unsigned int(16) picture_width;
  unsigned int(16) picture_height;
  unsigned int(16) frame_rate;
}
class RecVideoFormatMetaDataSample (in
...