Video surveillance systems for use in security applications - Part 2-1: Video transmission protocols - General requirements

IEC 62676-2-1:2013 introduces an IP network interface for devices in surveillance applications. This International Standard specifies a network protocol for the full interoperability of video devices. On top of the basic layers protocols are defined to accomplish the full interoperability of video devices. In surveillance applications IP video devices have to use standardized protocols to accomplish following functionality: video streaming, stream control, event handling, discovery, capability description, device management, PTZ control, auxiliaries and other functions.

Systèmes de vidéosurveillance destinés à être utilisés dans les applications de sécurité - Partie 2-1: Protocoles de transmission vidéo - Exigences générales

La CEI 62676-2-1:2013 présente une interface de réseau IP destinée aux applications de surveillance. Cette Norme Internationale spécifie un protocole de réseau pour la pleine interopérabilité des dispositifs vidéo. Au sommet des couches de base, des protocoles sont définis pour réaliser la pleine interopérabilité des dispositifs vidéo. Dans les applications de surveillance, les dispositifs vidéo IP doivent utiliser des protocoles normalisés pour assurer les fonctionnalités suivantes: la transmission vidéo en continu, le contrôle des flux, la gestion des événements, la découverte, la description des fonctionnalités, la gestion des dispositifs, les commandes PTZ, les auxiliaires et d'autres fonctions.

General Information

Status
Published
Publication Date
06-Nov-2013
Current Stage
PPUB - Publication issued
Start Date
07-Nov-2013
Completion Date
07-Nov-2013
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IEC 62676-2-1
Edition 1.0 2013-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Video surveillance systems for use in security applications –
Part 2-1: Video transmission protocols – General requirements
Systèmes de vidéosurveillance destinés à être utilisés dans les applications de
sécurité –
Partie 2-1: Protocoles de transmission vidéo – Exigences générales
IEC 62676-2-1:2013
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 62676-2-1
Edition 1.0 2013-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Video surveillance systems for use in security applications –
Part 2-1: Video transmission protocols – General requirements
Systèmes de vidéosurveillance destinés à être utilisés dans les applications de
sécurité –
Partie 2-1: Protocoles de transmission vidéo – Exigences générales
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX W
ICS 13.320 ISBN 978-2-8322-1181-6

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – 62676-2-1 © IEC:2013
CONTENTS

FOREWORD ........................................................................................................................... 4

INTRODUCTION ..................................................................................................................... 6

1 Scope ............................................................................................................................... 7

2 Normative references ....................................................................................................... 7

3 Terms, definitions and abbreviations ................................................................................ 8

3.1 Terms and definitions .............................................................................................. 8

3.2 Abbreviations ........................................................................................................ 15

4 Video transmission network architecture ......................................................................... 16

4.1 General ................................................................................................................. 16

4.2 Networking and connectivity .................................................................................. 17

4.2.1 General ..................................................................................................... 17

4.2.2 Network streaming performance: quality of service .................................... 18

4.3 Device discovery and description .......................................................................... 18

4.4 Video media types and payload formats ................................................................ 18

4.5 Video transport ...................................................................................................... 18

4.6 Eventing and health check ..................................................................................... 18

5 The building block of existing standards ......................................................................... 19

6 VSS device model .......................................................................................................... 19

6.1 Overview ............................................................................................................... 19

6.2 Device model elements ......................................................................................... 20

7 General IP interoperability requirements ......................................................................... 21

7.1 General ................................................................................................................. 21

7.2 General protocol requirements overview ................................................................ 21

7.3 General high level IP video interface and protocol requirements ............................ 21

7.3.1 General ..................................................................................................... 21

7.3.2 Versioning, capability exchange, and extensibility requirements ................ 22

7.3.3 Implementations ........................................................................................ 22

7.4 Non-conformance video transmission systems and devices ................................... 22

7.5 Mandatory documentation for the IP video interface of a VTD ................................ 22

7.6 Video and data transport: mandatory streaming requirements ............................... 24

7.7 Overview ............................................................................................................... 24

8 Live streaming ................................................................................................................ 25

8.1 General ................................................................................................................. 25

8.2 Media stream protocol ........................................................................................... 25

8.2.1 Transport format ........................................................................................ 25

8.2.2 Media transport ......................................................................................... 25

8.2.3 Synchronization point ................................................................................ 27

8.3 Media control protocol ........................................................................................... 28

8.3.1 Stream control ........................................................................................... 28

8.3.2 RTSP ........................................................................................................ 28

8.3.3 Keep-alive method for RTSP session ......................................................... 29

8.3.4 RTSP audio and video synchronization ...................................................... 30

8.3.5 RTSP message example ............................................................................ 31

8.4 Error handling ....................................................................................................... 32

9 Playback ........................................................................................................................ 32

9.1 General ................................................................................................................. 32

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62676-2-1 © IEC:2013 – 3 –

9.2 RTP header extension ........................................................................................... 32

10 Device discovery and description.................................................................................... 32

11 Eventing requirements .................................................................................................... 32

Bibliography .......................................................................................................................... 34

Figure 1 – Overview IP Video standard protocol .................................................................... 17

Figure 2 – Functional protocol layers .................................................................................... 17

Figure 3 – Building block of existing standards ..................................................................... 19

Figure 4 – VTD example network .......................................................................................... 20

Figure 5 – Layer structure ..................................................................................................... 24

Figure 6 – RTCP sequence ................................................................................................... 26

Figure 7 – RTCP sender report ............................................................................................. 27

Figure 8 – Media synchronization.......................................................................................... 27

Figure 9 – Stream control ..................................................................................................... 28

Figure 10 – Keep alive .......................................................................................................... 30

Table 1 – RTSP methods ...................................................................................................... 29

---------------------- Page: 5 ----------------------
– 4 – 62676-2-1 © IEC:2013
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
VIDEO SURVEILLANCE SYSTEMS FOR USE
IN SECURITY APPLICATIONS –
Part 2-1: Video transmission protocols –
General requirements
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

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

International Standard IEC 62676-2-1 has been prepared by IEC technical committee 79:

Alarm and electronic security systems.
The text of this standard is based on the following documents:
FDIS Report on voting
79/435/FDIS 79/448/RVD

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts in the IEC 62676 series, published under the general title Video surveillance

systems for use in security applications, can be found on the IEC website.
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62676-2-1 © IEC:2013 – 5 –

The committee has decided that the contents of this publication will remain unchanged until

the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data

related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct

understanding of its contents. Users should therefore print this document using a

colour printer.
---------------------- Page: 7 ----------------------
– 6 – 62676-2-1 © IEC:2013
INTRODUCTION

The IEC Technical Committee 79 in charge of alarm and electronic security systems together

with many governmental organisations, test houses and equipment manufacturers have

defined a common framework for video surveillance transmission in order to achieve

interoperability between products.

The IEC 62676 series of standards on video surveillance system is divided into 4 independent

parts:
Part 1: System requirements
Part 2: Video transmission protocols
Part 3: Analog and digital video interfaces
Part 4: Application guidelines (to be published)

Each part has its own clauses on scope, references, definitions and requirements.

This IEC 62676-2 series consists of 3 subparts, numbered parts 2-1, 2-2 and 2-3 respectively:

IEC 62676-2-1, Video transmission protocols – General requirements

IEC 62676-2-2, Video transmission protocols – IP interoperability implementation based on

HTTP and REST services

IEC 62676-2-3, Video transmission protocols – IP interoperability implementation based on

Web services

The first subpart of this IEC 62676-2 series defines protocol requirements to be fulfilled by

any high-level IP video device interface. The following two parts – Part 2-2 and Part 2-3 –

define two alternative protocols, one is based on HTTP and REST services and the second is

based on Web Services. It is based on the general requirements for video transmission of

IEC 62676-1-2, which defines minimum IP connectivity requirements, basic video streaming,

stream control, eventing, discovery and description functions.

The purpose of the transmission system in a video surveillance system installation is to

provide reliable transmission of video signals between the different types of Video

Surveillance System (VSS) so far called CCTV equipment in security, safety and monitoring

applications.

Today VSS reside in security networks using IT infrastructure, equipment and connections

within the protected site itself.
---------------------- Page: 8 ----------------------
62676-2-1 © IEC:2013 – 7 –
VIDEO SURVEILLANCE SYSTEMS FOR USE
IN SECURITY APPLICATIONS –
Part 2-1: Video transmission protocols –
General requirements
1 Scope

This part of IEC 62676 introduces an IP network interface for devices in surveillance

applications. This International Standard specifies a network protocol for the full

interoperability of video devices. On top of the basic layers protocols are defined to

accomplish the full interoperability of video devices. In surveillance applications IP video

devices have to use standardized protocols to accomplish following functionality: video

streaming, stream control, event handling, discovery, capability description, device

management, PTZ control, auxiliaries and other functions.

Some areas of this transmission standard are covered by more than one approach, e.g.

ZeroConf and WS-Discovery.

The network protocols recommended and defined by this video transmission standard are

selected with a sense for future relevance and further extensions.

Video transmission equipment may be combined with additional functions, e.g. for audio or

metadata transmission.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and

are indispensable for its application. For dated references, only the edition cited applies. For

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

IEC 62676-1-2, Video surveillance systems for use in security applications – Part 1-2: System

requirements – Performance requirements for video transmission

IEC 62676-2-2, Video surveillance systems for use in security applications – Part 2-2: Video

transmission protocols – IP interoperability implementation based on HTTP and REST

services

IEC 62676-2-3, Video surveillance systems for use in security applications – Part 2-3: Video

transmission protocols – IP interoperability implementation based on web services

IETF RFC 2326:1998, Real Time Streaming Protocol (RTSP)
IETF RFC 3016, RTP Payload Format for MPEG-4 Audio-Visual Streams

IETF RFC 3550, A transport protocol for Real-Time Applications (Replaces RFC 1889)

IETF RFC 3550, Standard 64, RTP: A Transport Protocol for Real-Time Applications

IETF RFC 3551, Profile for audio and video conferences with minimal control (Replaces

RFC890)
---------------------- Page: 9 ----------------------
– 8 – 62676-2-1 © IEC:2013

IETF RFC 3551, Standard 65, RTP Profile for Audio and Video Conferences with Minimal

Control
IETF RFC 3984, RTP payload format for H.264/AVC
IETF RFC 4566, SDP: Session Description Protocol

IETF RFC 4571, Framing Real-time Transport Protocol and RTP Control Protocol [RTCP]

Packets over Connection-Oriented Transport
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1.1
analog

a form of information that is represented by a continuous and smoothly varying amplitude or

frequency changes over a certain range
3.1.2
analog video
video signal made of a continuous electrical signal
3.1.3
application program interface
a set of interfaces for developers to interact with a component or application
3.1.4
bandwidth

property of networks to describe the amount of data that can be carried from one point in the

network to another in a given time period, usually a second, affected in video surveillance by

frame rate, image resolution, compression ratio, image noise, complexity detail of a monitored

scene
3.1.5
capability

a named piece of functionality (or feature) that is declared as supported or requested by an

agent
3.1.6
capturing

process of transferring video from one source to another for use on a digital video device,

network or storage, e.g. conversion of analog to digital
3.1.7
channel

one or more streams of video, audio and/or metadata that together constitute a unique entity

for the purpose of surveillance
3.1.8
client

a software application or other entity that uses the services offered by a Video Transmission

Device (VTD)
---------------------- Page: 10 ----------------------
62676-2-1 © IEC:2013 – 9 –
3.1.9
codec

abbreviation of compression/decompression algorithm, used to encode and decode, or

compress and decompress data, such as video
3.1.10
component

a software or hardware object, meant to interact with other components, encapsulating certain

functionality or a set of functionalities with clearly defined interfaces and conforming to a

prescribed behavior common to all components within a standard
3.1.11
device description

formal definition of a network device, expressed in XML syntax, specified by a vendor

3.1.12
digital
information coded in discrete, separate pulses or signal levels
3.1.13
digital video recorder
DVR

network video device recording multiple analog video channels onto a hard disk in digital

format, which allows viewing, replay and management remotely via a VT client
3.1.14
discovery

act of locating a network device or machine-processable description of a service-related

resource that may have been previously unknown and that meets certain functional criteria

3.1.15
DNS
domain name system

protocol that enables hierarchical naming system in a network for identification and resolving

symbolic names such as domain or computer names for example translate http://Videoserver1

or www.upnp.org into IP addresses
3.1.16
DTD
document type definition

document defining the format of the contents presented between the tags in an XML

document, and the way they should be interpreted by the application reading the XML

document
3.1.17
dynamic host configuration protocol
DHCP

protocol to automatically provide IP addresses and other network configuration information to

network nodes
3.1.18
event
notification of one or more changes in state variables sent by a network device
3.1.19
eventing

the exchange of specially-formatted messages describing events of a event server e.g

network device
---------------------- Page: 11 ----------------------
– 10 – 62676-2-1 © IEC:2013
3.1.20
frame

full frame of video as acquired in progressive mode or as combination of two image fields

interlaced together
3.1.21
identifier

code associated with each object which uniquely identifies the object e.g. for SNMP in the

global tree of objects
3.1.22
IETF
Internet engineering task force

standards body that forms Working Groups to develop technology for the Internet community

3.1.23
I-frame

independent frame coded as intraframe of an image sequence of differential coded frames

3.1.24
Internet protocol
basic connectionless network-layer protocol
3.1.25
IP camera

device capturing and transmitting live video images over an IP network allowing remote

viewing, recording, and management
3.1.26
Internet protocol video
IP video

transmission of video signals over an IP network: representation of sequential image

information in digital (discrete level) formats that are transferred using IP data packets

(datagrams) including associated protocols for discovery, description, streaming, stream

control, eventing, control and configuration of video network devices
3.1.27
IP video Interface
software point of communication for IP video between a device and the network
3.1.28
IP video Network

collection of video transmission devices connected to each other allowing to communicate

with each other, share resources and information over a variety of connection protocols

3.1.29
interoperability

ability of communication of systems and units to provide services and to accept services from

other systems and units, in order to use the services for efficient operation;

ability for information or services to be exchanged directly and smoothly between providers

and consumers
3.1.30
jitter
variation in a network delay that is perceived by the receiver of each packet
---------------------- Page: 12 ----------------------
62676-2-1 © IEC:2013 – 11 –
3.1.31
latency

delay in the response of far end participants, often a result of network congestion and

geographic distance
3.1.32
link

relationship between two network nodes when one resource refers to the other resource e.g.

by the means of a URI
3.1.33
message

the basic unit of communication containing the data to be transmitted between network nodes

such as client and server
3.1.34
messaging

exchange of messages, which are specially formatted data packets, describing events,

commands, status information, requests, replies, etc of a messaging source to a subscribing

or listening client
3.1.35
moving picture experts group
MPEG

working committee that defines and develops industry standards for digital video systems,

specifying the data compression and decompression processes and how they are delivered

on digital video systems
Note 1 to entry: This note applies to the French language only.
3.1.36
network architecture
framework and technology foundation for the design, building and managing of a

communication network, typically in a layered structure dividing the communication tasks into

a number of smaller parts, each part accomplishing a particular sub-task and interacting with

the other parts in a small number of well-defined ways
3.1.37
network connectivity

physical (wired or wireless) and logical (protocol) connection of multiple devices or a single

device to a network, such as a IP video network
3.1.38
netwo
...

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