Information technology — High efficiency coding and media delivery in heterogeneous environments — Part 8: Conformance specification for HEVC

This document specifies a set of tests and procedures designed to indicate whether encoders or decoders meet the normative requirements specified in Rec. ITU-T H.265 | ISO/IEC 23008‑2. NOTE The conformance bitstreams identified within the text are available at http://standards.iso.org/iso-iec/23008/-8/ed-2/en.

Technologies de l'information — Codage à haute efficacité et livraison des medias dans des environnements hétérogènes — Partie 8: Spécification de conformité du codage video à haute efficacité

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INTERNATIONAL ISO/IEC
STANDARD 23008-8
Second edition
2018-08
Information technology — High
efficiency coding and media delivery
in heterogeneous environments —
Part 8:
Conformance specification for HEVC
Technologies de l'information — Codage à haute efficacité et livraison
des medias dans des environnements hétérogènes —
Partie 8: Spécification de conformité du codage video à haute
efficacité
Reference number
ISO/IEC 23008-8:2018(E)
ISO/IEC 2018
---------------------- Page: 1 ----------------------
ISO/IEC 23008-8:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO/IEC 2018

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
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO/IEC 2018 – All rights reserved
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ISO/IEC 23008-8:2018(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms, definitions, abbreviated terms and conventions ............................................................................................ 1

4 Conformance testing for Rec. ITU-T H.265 | ISO/IEC 23008-2 .............................................................................. 2

4.1 General ........................................................................................................................................................................................................... 2

4.2 Bitstream conformance ................................................................................................................................................................... 2

4.3 Decoder conformance ....................................................................................................................................................................... 2

4.4 Procedure to test bitstreams ....................................................................................................................................................... 2

4.5 Procedure to test decoder conformance ........................................................................................................................... 3

4.5.1 Conformance bitstreams ........................................................................................................................................... 3

4.5.2 Contents of the bitstream file ............................................................................................................................... 3

4.5.3 Requirements on output of the decoding process and timing ................................................. 3

4.5.4 Recommendations (informative) ...................................................................................................................... 4

4.5.5 Static tests for output order conformance .................. ............................................................................... 4

4.5.6 Dynamic tests for output timing conformance ...................................................................................... 4

4.5.7 Decoder conformance test of a particular profile, tier, and level ........................................... 5

4.6 Specification of the test bitstreams ....................................................................................................................................... 6

4.6.1 General...................................................................................................................................................................................... 6

4.6.2 Test bitstreams — Block structure .................................................................................................................. 6

4.6.3 Test bitstreams — Intra coding ........................................................................................................................... 7

4.6.4 Test bitstreams — Inter frame coding .......................................................................................................... 8

4.6.5 Test bitstreams — Transform and quantization ...............................................................................11

4.6.6 Test bitstreams — Deblocking filter ............................................................................................................14

4.6.7 Test bitstreams — Sample adaptive offset .............................................................................................16

4.6.8 Test bitstreams — Entropy coding ................................................................................................................17

4.6.9 Test bitstreams — Temporal scalability ...................................................................................................19

4.6.10 Test bitstreams — Parallel processing tools .........................................................................................20

4.6.11 Test bitstreams — Other coding tools ........................................................................................................24

4.6.12 Test bitstreams — High level syntax ...........................................................................................................26

4.6.13 Test bitstreams — 10 bit ........................................................................................................................................33

4.6.14 Test bitstreams — MV-HEVC ..............................................................................................................................37

4.6.15 Test bitstreams — 3D-HEVC ...............................................................................................................................41

4.6.16 Test bitstreams — Format Range Extensions ......................................................................................48

4.6.17 Test bitstreams — Scalable extensions .....................................................................................................58

4.7 Normative conformance test suites for Rec. ITU-T H.265 | ISO/IEC 23008-2 ............................113

4.7.1 Bitstreams for Main, Main Still Picture, and Main 10 profiles ............................................113

4.7.2 Bitstreams for Multiview Main profile ....................................................................................................118

4.7.3 Bitstreams for 3D Main profile ......................................................................................................................119

4.7.4 Bitstreams for Monochrome 12, Monochrome 16, Main 12, Main 4:2:2 10,
Main 4:2:2 12, Main 4:4:4, Main 4:4:4 10, Main 4:4:4 12, Main Intra, Main
10 Intra, Main 12 Intra, Main 4:2:2 10 Intra, Main 4:2:2 12 Intra, Main
4:4:4 Intra, Main 4:4:4 10 Intra, Main 4:4:4 12 Intra, Main 4:4:4 16 Intra,

Main 4:4:4 Still Picture and Main 4:4:4 16 Still Picture profiles .......................................121

4.7.5 Bitstreams for Scalable Main and Scalable Main 10 profiles ...............................................123

4.7.6 Bitstreams for Scalable Monochrome, Scalable Monochrome 12, Scalable

Monochrome 16, and Scalable Main 4:4:4 profiles ......................................................................126

© ISO/IEC 2018 – All rights reserved iii
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ISO/IEC 23008-8:2018(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

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. In the field of information technology, ISO and IEC have established a joint technical committee,

ISO/IEC JTC 1.

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).

Attention is drawn to the possibility that some of the elements of this document may be the subject

of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent

rights. Details of any patent rights identified during the development of the document will be in the

Introduction and/or on the ISO list of patent declarations received (see www .iso .org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on 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 the following

URL: www .iso .org/iso/foreword .html.

This document was prepared by Technical Committee ISO/IEC JTC 1, Information technology,

Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information, in collaboration

with ITU-T. A technically aligned twin text is published as ITU-T H.265.1.

This second edition cancels and replaces the first edition (ISO/IEC ISO/IEC 23008-8:2015), which has

been technically revised.
The main changes compared to the previous edition are as follows:
— addition of conformance testing for Multiview Main and 3D Main profiles;
— addition of conformance testing for Format Range Extensions profiles;
— addition of conformance testing for Scalable profiles.
A list of all parts in the ISO/IEC 23008 series can be found on the ISO website.
iv © ISO/IEC 2018 – All rights reserved
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INTERNATIONAL STANDARD ISO/IEC 23008-8:2018(E)
Information technology — High efficiency coding and
media delivery in heterogeneous environments —
Part 8:
Conformance specification for HEVC
1 Scope

This document specifies a set of tests and procedures designed to indicate whether encoders or

decoders meet the normative requirements specified in Rec. ITU-T H.265 | ISO/IEC 23008-2.

NOTE The conformance bitstreams identified within the text are available at http: //standards .iso .org/iso

-iec/23008/ -8/ed -2/en.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

Rec. ITU-T H.265 | ISO/IEC 23008-2:2017, Information technology — High efficiency video coding and

media delivery in heterogeneous environment — Part 2: High Efficiency Video Coding

Rec. ITU-T H.265.2 | ISO/IEC 23008-5, Information technology — High efficiency video coding and media

delivery in heterogeneous environment — Part 2: High Efficiency Video Coding Reference Software

3 Terms, definitions, abbreviated terms and conventions

For the purposes of this document, the terms, definitions, abbreviated terms and conventions given in

Rec. ITU-T H.265 | ISO/IEC 23008-2 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http: //www .electropedia .org/
— ISO Online browsing platform: available at https: //www .iso .org/obp
3.1
bitstream

sequence of bits, in the form of a NAL unit stream or a byte stream, that forms the representation of

coded pictures and associated data forming one or more CVSs

Note 1 to entry: In this document, this refers specifically to video bitstream according to ISO/IEC 23008-2.

[SOURCE: Rec. ITU-T H.265 | ISO/IEC 23008-2:2017, 3.12, modified – Note 1 to entry added]

3.2
decoder
embodiment of a decoding process

Note 1 to entry: In this document, this refers specifically to a video decoder as specified in ISO/IEC 23008-2.

Note 2 to entry: The decoder does not include the display process, which is outside the scope of this document.

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ISO/IEC 23008-8:2018(E)

[SOURCE: Rec. ITU-T H.265 | ISO/IEC 23008-2:2017, 3.40, modified – Notes 1 and 2 to entry added]

3.3
encoder
embodiment of an encoding process

Note 1 to entry: The process, not specified in this document (except in regard to identification of the reference

software encoder), produces a bitstream.

[SOURCE: Rec. ITU-T H.265 | ISO/IEC 23008-2:2017, 3.49, modified – Note 1 to entry added]

3.4
reference software decoder
decoding software required for this document

Note 1 to entry: For this document, the reference software decoder is provided in Rec. ITU-T H.265.2 | ISO/IEC

23008-5.
3.5
reference software encoder
encoding software required for this document

Note 1 to entry: For this document, the reference software encoder is provided in Rec. ITU-T H.265.2 | ISO/IEC

23008-5.
4 Conformance testing for Rec. ITU-T H.265 | ISO/IEC 23008-2
4.1 General

The following clauses specify normative tests for verifying conformance of video bitstreams as well

as decoders. Those normative tests make use of test data (bitstream test suites) provided at http:

//standards .iso .org/iso -iec/23008/ -8/ed -2/en and the reference software decoder specified in Rec.

ITU-T H.265.2 | ISO/IEC 23008-5.
4.2 Bitstream conformance

Bitstream conformance for Rec. ITU-T H.265 | ISO/IEC 23008-2 is specified by ISO/IEC 23008-2:2017, C.4.

4.3 Decoder conformance

Decoder conformance for Rec. ITU-T H.265 | ISO/IEC 23008-2 is specified by ISO/IEC 23008-2:2017, C.5.

4.4 Procedure to test bitstreams

A bitstream that claims conformance with Rec. ITU-T H.265 | ISO/IEC 23008-2 shall pass the following

normative test.

The bitstream shall be decoded by processing it with the reference software decoder. When processed by

the reference software decoder, the bitstream shall not cause any error or non-conformance messages

to be reported by the reference software decoder. This test should not be applied to bitstreams that

are known to contain errors introduced by transmission, as such errors are highly likely to result in

bitstreams that lack conformance to Rec. ITU-T H.265 | ISO/IEC 23008-2.

Successfully passing the reference software decoder test provides only a strong presumption that the

bitstream under test is conforming to the video layer, i.e., that it does indeed meet all the requirements

for the video layer (except Annexes C, D and E) specified in Rec. ITU-T H.265 | ISO/IEC 23008-2 that are

tested by the reference software decoder.
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ISO/IEC 23008-8:2018(E)

Additional tests may be necessary to more thoroughly check that the bitstream properly meets

all the requirements specified in Rec. ITU-T H.265 | ISO/IEC 23008-2 including the hypothetical

reference decoder (HRD) conformance (based on Annexes C, D and E). These complementary tests

may be performed using other video bitstream verifiers that perform more complete tests than those

implemented by the reference software decoder.

Rec. ITU-T H.265 | ISO/IEC 23008-2 contains several informative recommendations that are not an

integral part of that Document. When testing a bitstream for conformance, it may also be useful to test

whether or not the bitstream follows those recommendations.

To check correctness of a bitstream, it is necessary to parse the entire bitstream and to extract all the

syntax elements and other values derived from those syntactic elements and used by the decoding

process specified in Rec. ITU-T H.265 | ISO/IEC 23008-2.

A verifier may not necessarily perform all stages of the decoding process specified in Rec. ITU-T H.265 |

ISO/IEC 23008-2 in order to verify bitstream correctness. Many tests can be performed on syntax

elements in a state prior to their use in some processing stages.
4.5 Procedure to test decoder conformance
4.5.1 Conformance bitstreams

A bitstream has values of general_profile_idc, general_tier_flag, and general_level_idc corresponding

to a set of specified constraints on a bitstream for which a decoder conforming to a specified profile,

tier, and level is required in Rec. ITU-T H.265 | ISO/IEC 23008-2:2017, Annex A to properly perform the

decoding process.
4.5.2 Contents of the bitstream file

The conformance bitstreams are provided at http: //standards .iso .org/iso -iec/23008/ -8/ed -2/en. The

following information is included in a single zipped file for each such bitstream.

— bitstream;
— decoded pictures or hashes of decoded pictures (may not be present);
— short description of the bitstream;
— trace file (results while decoding the bitstream, in ASCII format).

In cases where the decoded pictures or hashes of decoded pictures are not available, the reference

software decoder shall be used to generate the necessary reference decoded pictures from the

bitstream.
4.5.3 Requirements on output of the decoding process and timing
Two classes of decoder conformance are specified:
— output order conformance;
— output timing conformance.

The output of the decoding process is specified in Rec. ITU-T H.265 | ISO/IEC 23008-2:2017, Clause 8

and Annex C.

For output order conformance, it is a requirement that all of the decoded pictures specified for output

in Rec. ITU-T H.265 | ISO/IEC 23008-2:2017, Annex C shall be output by a conforming decoder in the

specified order and that the values of the decoded samples in all of the pictures that are output shall be

(exactly equal to) the values specified in Rec. ITU-T H.265 | ISO/IEC 23008-2:2017, Clause 8.

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ISO/IEC 23008-8:2018(E)

For output timing conformance, it is a requirement that a conforming decoder shall also output the

decoded samples at the rates and times specified in Rec. ITU-T H.265 | ISO/IEC 23008-2:2017, Annex C.

The display process, which ordinarily follows the output of the decoding process, is outside the scope of

this document.
4.5.4 Recommendations (informative)

In addition to the requirements, it is desirable that conforming decoders implement various informative

recommendations specified in Rec. ITU-T H.265 | ISO/IEC 23008-2 that are not an integral part of that

document. This clause discusses some of these recommendations.

It is recommended that a conforming decoder be able to resume the decoding process as soon

as possible after the loss or corruption of part of a bitstream. In most cases it is possible to resume

decoding at the next start code or slice header. It is recommended that a conforming decoder be able to

perform concealment for the coding tree blocks or video packets for which all the coded data has not

been received.
4.5.5 Static tests for output order conformance

Static tests of a video decoder require testing of the decoded samples. This clause explains how this

test can be accomplished when the decoded samples at the output of the decoding process are available.

It may not be possible to perform this type of test with a production decoder (due to the lack of an

appropriate accessible interface in the design at which to perform the test). In that case this test should

be performed by the manufacturer during the design and development phase. Static tests are used for

testing the decoding process. The test will check that the values of the samples decoded by the decoder

under test shall be identical to the values of the samples decoded by the reference decoder. When a hash

of the values of the samples of the decoded pictures is attached to the bitstream file, a corresponding

hash operation performed on the values of the samples of the decoded pictures produced by the decoder

under test shall produce the same results.
4.5.6 Dynamic tests for output timing conformance

Dynamic tests are applied to check that all the decoded samples are output and that the timing of

the output of the decoder's decoded samples conforms to the specification of Rec. ITU-T H.265 | ISO/

IEC 23008-2:2017, Clause 8 and Annex C, and to verify that the HRD models (as specified by the CPB and

DPB specification in Rec. ITU-T H.265 | ISO/IEC 23008-2:2017, Annex C) are not violated when the bits

of the bitstream are delivered at the proper rate.

The dynamic test is often easier to perform on a complete decoding system, which may include a

systems decoder, a video decoder and a display process. It may be possible to record the output of

the display process and to check that display order and timing of decoded pictures are correct at the

output of the display process. However, since the display process is not within the normative scope of

Rec. ITU-T H.265 | ISO/IEC 23008-2, there may be cases where the output of the display process differs

in timing or value even though the video decoder is conforming. In this case, the output of the video

decoder itself (before the display process) would need to be captured in order to perform the dynamic

tests on the video decoder. In particular the output order and timing of the decoded pictures shall be

correct.

If buffering period and picture timing SEI messages are included in the test bitstream, HRD conformance

shall be verified using the values of nal_initial_cpb_removal_delay, nal_initial_cpb_removal_offset, au_

cpb_removal_delay_minus1 and pic_dpb_output_delay that are included in the bitstream.

If buffering period and picture timing SEI messages are not included in the bitstream, the following

inferences shall be made to generate the missing parameters:
— fixed_pic_rate_within_cvs_flag shall be inferred to be equal to 1;
— low_delay_hrd_flag shall be inferred to be equal to 0;
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ISO/IEC 23008-8:2018(E)
— cbr_flag shall be inferred to be equal to 0;

— The frame rate of the bitstream shall be inferred to be equal to the frame rate value specified in the

corresponding table of subclause 6.7, where the bitstream is listed. If this is missing, then a frame

rate of either 25 or 30 000 ÷ 1 001 can be inferred;

— vui_time_scale shall be set equal to 90 000 and the value of vui_num_units_in_tick shall be computed

based on frame rate;

— The bit rate of the bitstream shall be inferred to be equal to the maximum value for the level specified

in Rec. ITU-T H.265 | ISO/IEC 23008-2:2017, Table A-1;

— CPB and DPB sizes shall be inferred to be equal to the maximum value for the level specified in Rec.

ITU-T H.265 | ISO/IEC 23008-2:2017, Table A-1.
With the above inferences, the HRD shall be operated as follows.

— The CPB is filled starting at time t = 0, until it is full, before removal of the first access unit. This

means that the nal_initial_cpb_removal_delay shall be inferred to be equal to the total CPB buffer

size divided by the bit rate divided by 90 000 (rounded downwards) and nal_initial_cpb_removal_

offset shall be inferred to be equal to zero.

— The first access unit is removed at time t = nal_initial_cpb_removal_delay ÷ 90 000 and subsequent

access units are removed at intervals based on the frame distance, i.e. (90 000 ÷ vui_num_units_

in_tick).

— Using these inferences, the CPB will not overflow or underflow and the DPB will not overflow.

4.5.7 Decoder conformance test of a particular profile, tier, and level

In order for a decoder of a particular profile, tier, and level to claim output order conformance to Rec.

ITU-T H.265 | ISO/IEC 23008-2 as specified by this document, the decoder shall successfully pass the

static test specified in subclause 6.5.5 with all the bitstreams of the normative test suite specified for

testing decoders of this particular profile, tier, and level combination.

In order for a decoder of a particular profile, tier, and level to claim output timing conformance to Rec.

ITU-T H.265 | ISO/IEC 23008-2 as specified by this document, the decoder shall successfully pass both

the static test specified in subclause 6.5.5 and the dynamic test specified in subclause 6.5.6 with all the

bitstreams of the normative test suite specified for testing decoders of this particular profile, tier, and

level. Tables 1 through 6 specify the normative test suites for each profile, tier, and level combination.

The test suite for a particular profile, tier, and level combination is the list of bitstreams that are marked

with an 'X' in the column corresponding to that profile, tier, and level combination. In the column 'Main

tier', 'X' indicate the bitstream is for Main tier. A decoder conformed to Main tier shall be capable of

decoding the specified bitstreams, among the testing profile-level combination, indicated by 'X' at 'Main

tier' column in Table 1. A decoder conformed to High tier shall be capable of decoding all the specified

bitstreams, among the testing profile-level combination, in Table 1.

'X' indicates that the bitstream is designed to test both the dynamic and static conformance of the

decoder.
The bitstream column specifies the bitstream used for each test.

A decoder that conforms to the Main profile, Main Still Picture profile, or Main 10 profile at a specific

level shall be capable of decoding the specified bitstreams in Table 1.

A decoder that conforms to the Multiview Main profile at specific level shall be capable of decoding the

specified bitstreams in Table 2. In addition to the bitstreams defined in Table 3, a decoder that conforms

to the Multiview Main profile shall be capable of decoding the Main profile bitstreams specified in

Table 1.
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ISO/IEC 23008-8:2018(E)

A decoder that conforms to the 3D Main profile (as specified in Rec. ITU-T H.265 | ISO/IEC 23008-2:2017,

Clause I.11) at specific level shall be capable of decoding the specified bitstreams in Table 3. In addition

to the bitstreams defined in Table 3, a decoder that conforms to the 3D Main profile shall be capable of

decoding the Multiview Main profile bitstreams specified in Table 2.

A decoder that conforms to the Monochrome, Monochrome 12, Monochrome 16, Main 12, Main

4:2:2 10, Main 4:2:2 12, Main 4:4:4, Main 4:4:4 10, Main 4:4:4 12, Main Intra, Main 10 Intra, Main 12

Intra, Main 4:2:2 10 Intra, Main 4:2:2 12 Intra, Main 4:4:4 Intra, Main 4:4:4 10 Intra, Main 4:4:4 12

Intra, Main 4:4:4 16 Intra, Main 4:4:4 Still Picture, or Main 4:4:4 16 Still Picture profile (as specified

in Rec. ITU-T H.265 | ISO/IEC 23008-2:2017, A.3.5), which are collectively referred to as the format

range extensions profiles, shall be capable of decoding the specified bitstreams in Table 4. A decoder

that conforms to some format range extensions profiles is also required to be capable of decoding

bitstreams that conform to particular other profiles. Thus, in addition to the specified bitstreams in

Table 4, a decoder that conforms to a format range extensions profile shall also be capable of decoding

the bitstreams specified in Table 1 that conform to the decoding requirements specified for the format

range extensions profile in Rec. ITU-T H.265 | ISO/IEC 23008-2:2017, A.3.5.

A decoder that conforms to the High Throughput 4:4:4 16 Intra profile (as specified in Rec. ITU-T H.265 |

ISO/IEC 23008-2:2017, A.3.6) at specific level shall be capable of decoding the specified bitstreams in

Table 4.

A decoder that conforms to a list of profile, tier, level, INBLD capability quadruplets such that one of

the quadruplets corresponds to a profile indication of Scalable Main or Scalable Main 10 profile (as

specified in Rec. ITU-T H.265 | ISO/IEC 23008-2:2017, H.11.1.1) at specific level, shall be capable of

decoding the specified bitstreams in Table 5. A decoder that conforms to a list of profile, tier, level,

INBLD capability quadruplets such that one of the quadruplets corresponds to a profile indication of

Scalable Main or Scalable Main 10 profile at specific level shall also be capable of decoding the specified

bitstreams in Table 1.

A decoder that conforms to a list of profile, tier, level, INBLD capability quadruplets such that one of

the quadruplets corresponds to a profile indication of Scalable Monochrome, Scalable Monochrome 12,

Scala
...

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