ISO/IEC 14496-12:2020/DAmd 1

Support for new media types (haptics, volumetric visual) and other improvements

Titre manque

Standards Content (sample)

DRAFT AMENDMENT
ISO/IEC 14496-12:2020/DAM 1
ISO/IEC JTC 1/SC 29 Secretariat: JISC
Voting begins on: Voting terminates on:
2021-01-20 2021-04-14
Information technology — Coding of audio-visual
objects —
Part 12:
ISO base media file format
AMENDMENT 1: Support for new media types (haptics,
volumetric visual) and other improvements
Partie 12: Format ISO de base pour les fichiers médias
AMENDEMENT 1: Titre manque
ICS: 35.040.40
THIS DOCUMENT IS A DRAFT CIRCULATED
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This document is circulated as received from the committee secretariat.
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ISO/IEC 14496-12:2020/DAM 1:2021(E)
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NOTIFICATION OF ANY RELEVANT PATENT
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PROVIDE SUPPORTING DOCUMENTATION. ISO/IEC 2021
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ISO/IEC 14496-12:2020/DAM 1:2021(E)
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ISO/IEC 14496-12:2020/DAM 1:2021(E)
Foreword

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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 14496 series can be found on the ISO website.

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© ISO/IEC 2021 – All rights reserved iii
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ISO/IEC 14496-12:2020/DAM 1:2021(E)
Information technology — Coding of audio-visual
objects —
Part 12:
ISO base media file format
AMENDMENT 1: Support for new media types (haptics,
volumetric visual) and other improvements
In clause 3, add the following definitions, renumbering as needed
3.1.7
haptic media
timed tactile signals to be presented as part of the media presentation
3.1.31
volumetric visual media
timed visual media defining a visual coding in a three dimensional space
Note 1 to entry: In contrast to video media, which defines a planar coding.
in 8.3.3 insert after the bullet for cdsc, and number the notes
'cdtg'

• describes the referenced media tracks and track groups collectively; the 'cdtg' track

reference shall only be present in timed metadata tracks.

NOTE A timed metadata track containing 'cdsc' track reference to a track_group_id value describes each

track in the track group individually.
in 8.3.3 add at the end
'shsc'
• links a shadow sync track to a main track; see clause 9.5
in 8.5.2.3 replace
maxBitrate gives the maximum rate in bits/second over any window of one second.
avgBitrate gives the average rate in bits/second over the entire presentation.
with

maxBitrate gives the maximum rate in bits/second over any window of one second; this is a

measured value for stored content, or a value that a stream is configured not to exceed; the stream

shall not exceed this bitrate.

avgBitrate gives the average rate in bits/second of the stream; this is a measured value (cumulative

over the entire presentation) for stored content, or the configured target average bitrate for a stream.

© ISO/IEC 2021 – All rights reserved 1
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ISO/IEC 14496-12:2020/DAM 1:2021(E)
in 8.6.14.3 change
range_size indicates the size of the partial subsegment.

range_size indicates the size of the subsegment; the value 0 may be used in the last entry to

indicate the remaining bytes of the segment, to the end of the segment
in 8.7.8.1 replace

If aux_info_type and aux_info_type_parameter are omitted then the implied value of aux_info_type is

either (a) in the case of transformed content, such as protected content, the scheme_type included in the

ProtectionSchemeInfoBox or otherwise (b) the sample entry type.
with

If aux_info_type and aux_info_type_parameter are omitted then the implied value of aux_info_type is

either (a) in the case of transformed content, such as protected content, the scheme_type included in the

ProtectionSchemeInfoBox or ScrambleSchemeInfoBox, or otherwise (b) the sample entry type. In the

case of tracks containing multiple transformations, aux_info_type and aux_info_type_parameter shall

not be omitted.
in 8.8.13.1 replace

For example, padding_flag can be set equal to 1 when the following conditions are true:

[16]

• Each fraction contains two or more AVC, SVC, or MVC [ISO/IEC 14496-15 ] tracks of the same

video bitstream.

• The samples for each track of a fraction are contiguous and in decoding order in a MediaDataBox.

• The samples of the first AVC, SVC, or MVC level contain extractor NAL units for including the video

coding NAL units from the other levels of the same fraction.
with
The use of padding_flag is deprecated.
In 8.9.3.1, after the paragraph

There may be multiple instances of this box if there is more than one sample grouping for the samples in

a track. Each instance of the SampleGroupDescriptionBox has a type that distinguishes different sample

groupings. There shall be at most one instance of this box with a particular grouping_type in a track

(i.e. defined in a SampleTableBox or TrackFragmentBox).
insert

The flags field of the SampleGroupDescriptionBox shall be zero when the box is in a TrackFragmentBox.

When the box is in a SampleTableBox, either or both of the two lowest bits may be set:

• static_group_description, with value 1: when set to 1, this flag indicates that there are no

SampleGroupDescriptionBoxes of this grouping_type in any TrackFragmentBox of this track.

2 © ISO/IEC 2021 – All rights reserved
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ISO/IEC 14496-12:2020/DAM 1:2021(E)

• static_mapping, with value 2: when set to 1, this flag indicates that there are no SampleToGroupBoxes

of this grouping_type in this track (in neither the SampleTableBox nor any TrackFragmentBox of this

track); all samples therefore map to the default.

Note 1 the static_mapping flag is only useful when default_group_description_index is non-zero,

since the default value of default_group_description_index is 0, indicating no mapping.

These flags may be used in combination with the version of the SampleGroupDescriptionBox to signal

various possibilities.
• static_group_description without static_mapping:

the sample group definitions are only in the MovieBox, but samples can map to any of them.

• static_mapping without static_group_description:

everything in a fragment maps to at most one group; there may be new SampleGroupDescriptionBoxes

of this type in fragments; depending on their version, the SampleGroupDescri
...