I n t e r n a t i o n a l T e l e c o m m u n i c a t i o n U n i o n
ITU-T
H.265
TELECOMMUNICATION
STANDARDIZATION SECTOR
OF ITU
(04/2015)
SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMS
Infrastructure of audiovisual services – Coding of moving
video
High efficiency video coding
Recommendation ITU-T H.265
ITU-T H-SERIES RECOMMENDATIONS
AUDIOVISUAL AND MULTIMEDIA SYSTEMS
CHARACTERISTICS OF VISUAL TELEPHONE SYSTEMS
H.100–H.199
INFRASTRUCTURE OF AUDIOVISUAL SERVICES
General
H.200–H.219
Transmission multiplexing and synchronization
H.220–H.229
Systems aspects
H.230–H.239
Communication procedures
H.240–H.259
Coding of moving video
H.260–H.279
Related systems aspects
H.280–H.299
Systems and terminal equipment for audiovisual services
H.300–H.349
Directory services architecture for audiovisual and multimedia services
H.350–H.359
Quality of service architecture for audiovisual and multimedia services
H.360–H.369
Telepresence
H.420–H.429
Supplementary services for multimedia
H.450–H.499
MOBILITY AND COLLABORATION PROCEDURES
Overview of Mobility and Collaboration, definitions, protocols and procedures
H.500–H.509
Mobility for H-Series multimedia systems and services
H.510–H.519
Mobile multimedia collaboration applications and services
H.520–H.529
Security for mobile multimedia systems and services
H.530–H.539
Security for mobile multimedia collaboration applications and services
H.540–H.549
Mobility interworking procedures
H.550–H.559
Mobile multimedia collaboration inter-working procedures
H.560–H.569
BROADBAND, TRIPLE-PLAY AND ADVANCED MULTIMEDIA SERVICES
Broadband multimedia services over VDSL
H.610–H.619
Advanced multimedia services and applications
H.620–H.629
Ubiquitous sensor network applications and Internet of Things
H.640–H.649
IPTV MULTIMEDIA SERVICES AND APPLICATIONS FOR IPTV
General aspects
H.700–H.719
IPTV terminal devices
H.720–H.729
IPTV middleware
H.730–H.739
IPTV application event handling
H.740–H.749
IPTV metadata
H.750–H.759
IPTV multimedia application frameworks
H.760–H.769
IPTV service discovery up to consumption
H.770–H.779
Digital Signage
H.780–H.789
E-HEALTH MULTIMEDIA SERVICES AND APPLICATIONS
Interoperability compliance testing of personal health systems (HRN, PAN, LAN, TAN and
WAN)
H.820–H.859
Multimedia e-health data exchange services
H.860–H.869
For further details, please refer to the list of ITU-T Recommendations.
Rec. ITU-T H.265 v3 (04/2015) i
Recommendation ITU-T H.265
High efficiency video coding
Summary
Recommendation ITU-T H.265 | International Standard ISO/IEC 23008-2 represents an evolution of the existing video
coding Recommendations (ITU-T H.261, ITU-T H.262, ITU-T H.263 and ITU-T H.264) and was developed in response
to the growing need for higher compression of moving pictures for various applications such as Internet streaming,
communication, videoconferencing, digital storage media and television broadcasting. It is also designed to enable the use
of the coded video representation in a flexible manner for a wide variety of network environments. The use of this
Recommendation | International Standard allows motion video to be manipulated as a form of computer data and to be
stored on various storage media, transmitted and received over existing and future networks and distributed on existing
and future broadcasting channels.
This revision adds Annex I with support for 3D high efficiency video coding (3D-HEVC), specifying a syntax and
associated decoding process for efficient coding of video textures and depth maps for 3D video applications. One additional
profile is defined in this revision, the "3D Main" profile.
This Recommendation | International Standard was developed jointly with ISO/IEC JTC 1/SC 29/WG 11 (MPEG) and
corresponds in a technically aligned manner to ISO/IEC 23008-2.
History
Edition
Recommendation
Approval
Study Group
Unique ID
*
1.0
ITU-T H.265
2013-04-13
16
11.1002/1000/11885
2.0
ITU-T H.265 (V2)
2014-10-29
16
11.1002/1000/12296
3.0
ITU-T H.265 (V3)
2015-04-29
16
11.1002/1000/12455
____________________
*
To access the Recommendation, type the URL http://handle.itu.int/ in the address field of your web browser, followed by the
Recommendation's unique ID. For example, http://handle.itu.int/11.1002/1000/11830-en.
ii Rec. ITU-T H.265 v3 (04/2015)
FOREWORD
The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of
telecommunications, information and communication technologies (ICTs). The ITU Telecommunication
Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical,
operating and tariff questions and issuing Recommendations on them with a view to standardizing
telecommunications on a worldwide basis.
The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes
the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics.
The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1.
In some areas of information technology which fall within ITU-T's purview, the necessary standards are
prepared on a collaborative basis with ISO and IEC.
NOTE
In this Recommendation, the expression "Administration" is used for conciseness to indicate both a
telecommunication administration and a recognized operating agency.
Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain
mandatory provisions (to ensure, e.g., interoperability or applicability) and compliance with the
Recommendation is achieved when all of these mandatory provisions are met. The words "shall" or some other
obligatory language such as "must" and the negative equivalents are used to express requirements. The use of
such words does not suggest that compliance with the Recommendation is required of any party.
INTELLECTUAL PROPERTY RIGHTS
ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve
the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or
applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of
the Recommendation development process.
As of the date of approval of this Recommendation, ITU had received notice of intellectual property, protected
by patents, which may be required to implement this Recommendation. However, implementers are cautioned
that this may not represent the latest information and are therefore strongly urged to consult the TSB patent
database at http://www.itu.int/ITU-T/ipr/.
ITU 2015
All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior
written permission of ITU.
Rec. ITU-T H.265 v3 (04/2015) iii
CONTENTS
Page
0 Introduction .................................................................................................................................................... 1
0.1 General ................................................................................................................................................ 1
0.2 Prologue .............................................................................................................................................. 1
0.3 Purpose ................................................................................................................................................ 1
0.4 Applications ........................................................................................................................................ 1
0.5 Publication and versions of this Specification ..................................................................................... 2
0.6 Profiles, tiers and levels ...................................................................................................................... 2
0.7 Overview of the design characteristics ................................................................................................ 2
0.8 How to read this Specification ............................................................................................................ 3
1 Scope .............................................................................................................................................................. 4
2 Normative references...................................................................................................................................... 4
2.1 General ................................................................................................................................................ 4
2.2 Identical Recommendations | International Standards ........................................................................ 4
2.3 Paired Recommendations | International Standards equivalent in technical content ........................... 4
2.4 Additional references .......................................................................................................................... 4
3 Definitions ...................................................................................................................................................... 4
4 Abbreviations and acronyms .......................................................................................................................... 13
5 Conventions .................................................................................................................................................... 15
5.1 General ................................................................................................................................................ 15
5.2 Arithmetic operators ............................................................................................................................ 15
5.3 Logical operators ................................................................................................................................. 15
5.4 Relational operators............................................................................................................................. 16
5.5 Bit-wise operators ............................................................................................................................... 16
5.6 Assignment operators .......................................................................................................................... 16
5.7 Range notation .................................................................................................................................... 16
5.8 Mathematical functions ....................................................................................................................... 17
5.9 Order of operation precedence ............................................................................................................ 17
5.10 Variables, syntax elements and tables ................................................................................................. 18
5.11 Text description of logical operations ................................................................................................. 19
5.12 Processes ............................................................................................................................................. 20
6 Bitstream and picture formats, partitionings, scanning processes and neighbouring relationships ................ 20
6.1 Bitstream formats ................................................................................................................................ 20
6.2 Source, decoded and output picture formats ....................................................................................... 20
6.3 Partitioning of pictures, slices, slice segments, tiles, coding tree units and coding tree blocks .......... 23
6.3.1 Partitioning of pictures into slices, slice segments and tiles.................................................. 23
6.3.2 Block and quadtree structures ............................................................................................... 24
6.3.3 Spatial or component-wise partitionings ............................................................................... 25
6.4 Availability processes ......................................................................................................................... 25
6.4.1 Derivation process for z-scan order block availability .......................................................... 25
6.4.2 Derivation process for prediction block availability ............................................................. 26
6.5 Scanning processes .............................................................................................................................. 27
6.5.1 Coding tree block raster and tile scanning conversion process ............................................. 27
6.5.2 Z-scan order array initialization process ............................................................................... 28
6.5.3 Up-right diagonal scan order array initialization process ...................................................... 28
6.5.4 Horizontal scan order array initialization process ................................................................. 29
6.5.5 Vertical scan order array initialization process ..................................................................... 29
7 Syntax and semantics ..................................................................................................................................... 30
7.1 Method of specifying syntax in tabular form ...................................................................................... 30
7.2 Specification of syntax functions and descriptors ............................................................................... 31
7.3 Syntax in tabular form ......................................................................................................................... 33
7.3.1 NAL unit syntax .................................................................................................................... 33
7.3.1.1 General NAL unit syntax ..................................................................................... 33
7.3.1.2 NAL unit header syntax ....................................................................................... 33
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