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International Telecommunication Union
ITU-T
H.265
TELECOMMUNICATION
STANDARDIZATION SECTOR
OF ITU
(04/2013)
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
Codin
g
of movin
g
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
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
For further details, please refer to the list of ITU-T Recommendations.
Rec. ITU-T H.265 (04/2013) i
Recommendation ITU-T H.265
High efficiency video coding
Summary
Recommendation ITU-T H.265 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 Recommendation 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
1.0 ITU-T H.265 2013-04-13 16
ii Rec. ITU-T H.265 (04/2013)
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 2013
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 (04/2013) iii
CONTENTS
Page
0
Introduction................................................................................................................................................................. 1
0.1 Prologue .............................................................................................................................................................. 1
0.2 Purpose ............................................................................................................................................................... 1
0.3 Applications ........................................................................................................................................................ 1
0.4 Publication and versions of this Specification .................................................................................................... 1
0.5 Profiles, tiers and levels ...................................................................................................................................... 2
0.6 Overview of the design characteristics ............................................................................................................... 2
0.7 How to read this Specification ............................................................................................................................ 2
1 Scope .......................................................................................................................................................................... 3
2 Normative references .................................................................................................................................................. 3
2.1 General ................................................................................................................................................................ 3
2.2 Identical Recommendations | International Standards ........................................................................................ 3
2.3 Paired Recommendations | International Standards equivalent in technical content .......................................... 3
2.4 Additional references .......................................................................................................................................... 3
3 Definitions .................................................................................................................................................................. 3
4 Abbreviations ............................................................................................................................................................ 12
5 Conventions .............................................................................................................................................................. 13
5.1 General .............................................................................................................................................................. 13
5.2 Arithmetic operators ......................................................................................................................................... 13
5.3 Logical operators .............................................................................................................................................. 13
5.4 Relational operators .......................................................................................................................................... 14
5.5 Bit-wise operators ............................................................................................................................................. 14
5.6 Assignment operators ........................................................................................................................................ 14
5.7 Range notation .................................................................................................................................................. 14
5.8 Mathematical functions ..................................................................................................................................... 15
5.9 Order of operation precedence .......................................................................................................................... 15
5.10 Variables, syntax elements, and tables .............................................................................................................. 16
5.11 Text description of logical operations ............................................................................................................... 17
5.12 Processes ........................................................................................................................................................... 18
6 Bitstream and picture formats, partitionings, scanning processes, and neighbouring relationships ......................... 18
6.1 Bitstream formats .............................................................................................................................................. 18
6.2 Source, decoded, and output picture formats .................................................................................................... 18
6.3 Partitioning of pictures, slices, slice segments, tiles, coding tree units, and coding tree blocks ....................... 21
6.3.1 Partitioning of pictures into slices, slice segments, and tiles .................................................................... 21
6.3.2 Block and quadtree structures ................................................................................................................... 22
6.3.3 Spatial or component-wise partionings ..................................................................................................... 23
6.4 Availability processes ....................................................................................................................................... 23
6.4.1 Derivation process for z-scan order block availability .............................................................................. 23
6.4.2 Derivation process for prediction block availability ................................................................................. 24
6.5 Scanning processes ........................................................................................................................................... 25
6.5.1 Coding tree block raster and tile scanning conversion process ................................................................. 25
6.5.2 Z-scan order array initialization process ................................................................................................... 26
6.5.3 Up-right diagonal scan order array initialization process .......................................................................... 26
6.5.4 Horizontal scan order array initialization process ..................................................................................... 27
6.5.5 Vertical scan order array initialization process ......................................................................................... 27
7 Syntax and semantics ................................................................................................................................................ 28
7.1 Method of specifying syntax in tabular form .................................................................................................... 28
7.2 Specification of syntax functions and descriptors ............................................................................................. 29
7.3 Syntax in tabular form ...................................................................................................................................... 30
7.3.1 NAL unit syntax ........................................................................................................................................ 30
7.3.1.1 General NAL unit syntax .................................................................................................................... 30
7.3.1.2 NAL unit header syntax ...................................................................................................................... 30
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