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Approved September 18, 2017
Copyright © 2017 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS
445 Hamilton
Avenue., White Plains, NY 10601
(914) 761-1100
SMPTE ST 2110-20:2017
SMPTE STANDARD
Professional Media Over
Managed IP Networks:
Uncompressed Active Video
Page 1 of 22 pages
Table of Contents
1 Scope 3
2 Conformance Notation 3
3 Normative References 3
4 Terms and Definitions 5
5 Textual Conventions 5
5.1 SDP Parameters and Values 5
6 Uncompressed Active Video RTP Essence Format 5
6.1 Payload Design and Packet format 5
6.2 RTP Payload: Sample Row Data Segments 9
6.3 Additional Constraints on the RTP Payload Definition 14
7 Session Description Protocol (SDP) Considerations 15
7.1 General SDP Declaration 15
7.2 Required Media Type Parameters 16
7.3 Media Type Parameters with default values 16
7.4 Sampling and Depth 17
7.5 Permitted values of Colorimetry 19
7.6 Permitted Values of TCS (Transfer Characteristic System) 19
7.7 Examples of SDP Media Section (informative) 20
Annex A Table of Typical Values for Block Packing Mode (Informative) 21
Bibliography (Informative) 22
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SMPTE ST 2110-20:2017
Page 2 of 22 pages
Foreword
SMPTE (the Society of Motion Picture and Television Engineers) is an internationally-recognized standards
developing organization. Headquartered and incorporated in the United States of America, SMPTE has
members in over 80 countries on six continents. SMPTE’s Engineering Documents, including Standards,
Recommended Practices, and Engineering Guidelines, are prepared by SMPTE’s Technology Committees.
Participation in these Committees is open to all with a bona fide interest in their work. SMPTE cooperates
closely with other standards-developing organizations, including ISO, IEC and ITU.
SMPTE Engineering Documents are drafted in accordance with the rules given in its Standards Operations
Manual. This SMPTE Engineering Document was prepared by Technology Committee 32NF.
Intellectual Property
At the time of publication no notice had been received by SMPTE claiming patent rights essential to the
implementation of this Engineering Document. However, attention is drawn to the possibility that some of the
elements of this document may be the subject of patent rights. SMPTE shall not be held responsible for
identifying any or all such patent rights.
Introduction
This section is entirely informative and does not form an integral part of this Engineering Document.
The capability and capacity of IP networking equipment has improved steadily, enabling the use of IP
switching and routing technology to transport and switch video, audio, and metadata essence within television
facilities. Existing standards such as SMPTE ST 2022-6 have gained use in this application, but there is a
desire in the industry to switch different essence elements separately.
This family of SMPTE engineering documents builds on the work of Video Services Forum (VSF) Technical
Recommendations TR03 and TR04, and on AES67, documenting a system for transporting various essence
streams over IP networks. The system is designed to be extensible to a variety of essence types.
SMPTE ST 2110-10 covers the system as a whole, the timing model, and common requirements across all
essence types.
This standard documents the transport of uncompressed active video in such systems, using an RTP format
based on IETF RFC 4175.
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SMPTE ST 2110-20:2017
Page 3 of 22 pages
1 Scope
This standard specifies the real-time, RTP-based transport of uncompressed active video essence over IP
networks. An SDP-based signaling method is defined for image technical metadata necessary to receive and
interpret the stream.
2 Conformance Notation
Normative text is text that describes elements of the design that are indispensable or contains the
conformance language keywords: "shall", "should", or "may". Informative text is text that is potentially helpful
to the user, but not indispensable, and can be removed, changed, or added editorially without affecting
interoperability. Informative text does not contain any conformance keywords.
All text in this document is, by default, normative, except: the Introduction, any section explicitly labeled as
"Informative" or individual paragraphs that start with "Note:”
The keywords "shall" and "shall not" indicate requirements strictly to be followed in order to conform to the
document and from which no deviation is permitted.
The keywords, "should" and "should not" indicate that, among several possibilities, one is recommended as
particularly suitable, without mentioning or excluding others; or that a certain course of action is preferred but
not necessarily required; or that (in the negative form) a certain possibility or course of action is deprecated
but not prohibited.
The keywords "may" and "need not" indicate courses of action permissible within the limits of the document.
The keyword “reserved” indicates a provision that is not defined at this time, shall not be used, and may be
defined in the future. The keyword “forbidden” indicates “reserved” and in addition indicates that the provision
will never be defined in the future.
A conformant implementation according to this document is one that includes all mandatory provisions
("shall") and, if implemented, all recommended provisions ("should") as described. A conformant
implementation need not implement optional provisions ("may") and need not implement them as described.
Unless otherwise specified, the order of precedence of the types of normative information in this document
shall be as follows: Normative prose shall be the authoritative definition; Tables shall be next; then formal
languages; then figures; and then any other language forms.
3 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this
engineering document. At the time of publication, the editions indicated were valid. All standards are subject
to revision, and parties to agreements based on this engineering document are encouraged to investigate the
possibility of applying the most recent edition of the standards indicated below.
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SMPTE ST 2110-20:2017
Page 4 of 22 pages
Internet Engineering Task Force (IETF) RFC 3550 RTP: A Transport Protocol for Real-Time Applications
[online, viewed 2017-08-10] Available at https://www.ietf.org/rfc/rfc3550.txt
Internet Engineering Task Force (IETF) RFC 4566 SDP: Session Description Protocol [online, viewed 2017-
08-10] Available at https://www.ietf.org/rfc/rfc4566.txt
Internet Engineering Task Force (IETF) RFC 5285 A General Mechanism for RTP Header Extensions [online,
viewed 2017-08-10] Available at https://www.ietf.org/rfc/rfc5285.txt
ISO 11664-1:2007 Colorimetry -- Part 1: CIE standard colorimetric observers
Recommendation ITU-R BT.601-7 Studio encoding parameters of digital television for standard 4:3 and wide
screen 16:9 aspect ratios
Recommendation ITU-R BT.709-6 Parameter values for the HDTV standards for production and international
programme exchange
Recommendation ITU-R BT.1886 Reference electro-optical transfer function for flat panel displays used in
HDTV studio production
Recommendation ITU-R BT.2020-2 (10/2015) Parameter values for ultra-high definition television systems for
production and international programme exchange
Recommendation ITU-R BT.2100-0 (07/2016) Image Parameter Values for High Dynamic Range Television
for use in Production and International Programme Exchange
SMPTE RP 157:2012 Key and Alpha Signals
SMPTE ST 428-1:2006 D-Cinema Distribution Master — Image Characteristics
SMPTE ST 2065-1:2012 Academy Color Encoding Specification (ACES)
SMPTE ST 2065-3:2012 Academy Density Exchange Encoding (ADX) — Encoding Academy Printing Density
(APD) Values
SMPTE RP 2077:2013 Full-Range Image Mapping
SMPTE ST 2110-10:2017 Professional Media over Managed IP Networks: System Timing and Definitions
SMPTE ST 2110-21:2017 Professional Media over Managed IP Networks: Traffic Shaping and Delivery
Timing for Uncompressed Active Video
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SMPTE ST 2110-20:2017
Page 5 of 22 pages
4 Terms and Definitions
For the purposes of this document, the terms and definitions of SMPTE ST 2110-10 and the following apply.
4.1 Sample Row Number
numerical indication of the position of a row of image samples within the sample array corresponding to the
visible (active) picture area
4.2 Sample Row
horizontal collection of image samples spanning the entire width of the image
4.3 Full-Bandwidth Sample Position
numerical location of a pixel within the Sample Row, in units of full-bandwidth samples, such that 0 is at the
left side of the image; for sampling methods where more than one color component is represented in full
bandwidth, all of the full-bandwidth components of each pixel share the same numerical location within the
sample row
5 Textual Conventions
5.1 SDP Parameters and Values
The names and values of SDP Media Type parameters within the text of this document are formatted using a
monospaced font (such as Courier) except when they appear in section headings.
6 Uncompressed Active Video RTP Essence Format
6.1 Payload Design and Packet format
6.1.1 General Provisions
The active sample arrays of the video essence shall be transported using RTP (IETF RFC 3550), subject to
the constraints and payload definition below.
Unless otherwise noted, multi-octet fields within the RTP Header, RTP Payload Header, and RTP Payload
shall be transmitted in Network Byte Order (most significant byte first). When represented in bit-field
diagrams such as Figure 1 or Figure 3, the most significant bits of multi-bit fields shall occupy the lowest-
numbered bit index positions (left-most positions in the figures), and shall be transmitted first.
The image technical metadata necessary to receive and interpret the RTP stream shall be communicated via
SDP as defined in section 7.
Senders and Receivers compliant to this standard shall comply with the provisions of SMPTE ST 2110-21.
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