EN IEC 62676-2-32:2019

Video surveillance systems for use in security applications - Part 2-32: Recording control and replay based on web services

IEC 62676-2-32:2019 specifies the web service interface for the configuration of the recording of video, audio and metadata. Additionally, associated events are defined. Web service usage is outside the scope of this document. Please refer to the IEC 60839‑11-31 for more information. This first edition, together with IEC 60839-11-31 and IEC 62676-2-31, cancels and replaces IEC 62676-2-3:2013. This edition includes the following significant technical changes with respect to IEC 62676-2-3:2013: a) an export file format has been added.

Videoüberwachungssysteme für Sicherungsanwendungen - Teil 2-32: Videoübertragungsprotokolle - IP-Interoperabilität auf Basis von Webservices - Aufzeichnung

Systèmes de vidéosurveillance destinés à être utilisés dans les applications de sécurité - Partie 2-32: Contrôle d'enregistrement et lecture en fonction des services Web

l'IEC 62676-2-32:2019 spécifie l'interface de services web pour la configuration de l'enregistrement des données vidéo et audio, ainsi que des métadonnées. De plus, les événements associés sont définis. L'utilisation des services web ne relève pas du domaine d'application du présent document. Se reporter à l'IEC 60839-11-31 pour de plus amples informations. Cette première édition, conjointement avec l'IEC 60839-11-31 et l'IEC 62676-2-31, annule et remplace l'IEC 62676-2-3:2013. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'IEC 62676‑2-3:2013: a) ajout d'un format de fichiers d'exportation.

Video nadzorni sistemi za varnostne aplikacije - 2-32. del: Kontrola snemanja in predvajanje na podlagi mrežnih servisov

Ta standard določa vmesnik spletne storitve za konfiguracijo snemanja videa, zvoka in metapodatkov. Poleg tega so opredeljeni tudi povezani dogodki. Točka 4 določa definicijo modela shranjevanja, na katerem temelji ta dokument. Uporaba spletne storitve ne spada na področje uporabe tega dokumenta. Za več informacij glej standard IEC 60839-11- 31.

General Information

• Status: Published
• Publication Date: 29-Aug-2019
• Withdrawal Date: 30-Jul-2022
• ICS: 13.320 - Alarm and warning systems
• Technical Committee: CLC/TC 79 - Alarm systems
• Drafting Committee: IEC/TC 79 - IEC_TC_79
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 30-Aug-2019
• Completion Date: 30-Aug-2019
• Ref Project: SIST EN IEC 62676-2-32:2019 - Video surveillance systems for use in security applications - Part 2-32: Recording control and replay based on web services

Relations

• Replaces: EN 62676-2-3:2014 - Video surveillance systems for use in security applications - Part 2-3: Video transmission protocols - IP interoperability implementation based on Web services
• Effective Date: 05-Nov-2019

Standards Content (Sample)

SLOVENSKI STANDARD
01-november-2019
Video nadzorni sistemi za varnostne aplikacije - 2-32. del: Kontrola snemanja in
predvajanje na podlagi mrežnih servisov
Video surveillance systems for use in security applications - Part 2-32: Recording control
and replay based on web services
Ta slovenski standard je istoveten z: EN IEC 62676-2-32:2019
ICS:
13.320 Alarmni in opozorilni sistemi Alarm and warning systems
33.160.40 Video sistemi Video systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 62676-2-32

NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2019
ICS 13.320
English Version
Video surveillance systems for use in security applications - Part
2-32: Recording control and replay based on web services
(IEC 62676-2-32:2019)
Systèmes de vidéosurveillance destinés à être utilisés dans Videoüberwachungssysteme für Sicherheitsanwendungen -
les applications de sécurité - Partie 2-32: Contrôle Teil 2-32: Videoübertragungsprotokolle - IP-Interoperabilität
d'enregistrement et lecture en fonction des services Web auf Basis von Webservices - Aufzeichnung
(IEC 62676-2-32:2019) (IEC 62676-2-32:2019)
This European Standard was approved by CENELEC on 2019-07-31. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 62676-2-32:2019 E

European foreword
The text of document 79/621/FDIS, future edition 1 of IEC 62676-2-32, prepared by IEC/TC 79 "Alarm
and electronic security systems" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN IEC 62676-2-32:2019.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2020-04-30
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2022-07-31
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice
The text of the International Standard IEC 62676-2-32:2019 was approved by CENELEC as a
European Standard without any modification.

Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
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.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60839-11-31 2016 Alarm and electronic security systems - EN 60839-11-31 2017
Part 11-31: Electronic access control
systems - Core interoperability protocol
based on Web services
IEC 62676-2-31 2019 Video surveillance systems for use in - -
security applications - Part 2-31: Live
streaming and control based on web
services
Internet Assigned - Media Types - -
Numbers Authority
RFC 2326 -  Real Time Streaming Protocol (RTSP) - -
RFC 3280 -  Internet X.509 Public Key Infrastructure - -
Certificate and Certificate Revocation List
(CRL) Profile
RFC 3550 -  RTP: A Transport Protocol for Real-Time - -
Applications
RFC 4055 -  Additional Algorithms and Identifiers for - -
RSA Cryptography for use in the Internet
X.509 Public Key Infrastructure - Certificate
and Certificate Revocation List (CRL)
Profile
SOAP12-PART1 - SOAP 1.2 – Part 1, Messaging Framework - -
XML-Schema 1 - W3C XML Schema – Part 1: - -
Structures Second Edition
XML-Schema 2 -  W3C XML Schema – Part 2: Datatypes -  -
Second Edition
XPath 1.0 -  XML Path Language (XPath) Version 1.0 -  -
FIPS 180-4 -  Secure Hash Standard (SHS) - -

IEC 62676-2-32 ®
Edition 1.0 2019-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Video surveillance systems for use in security applications –

Part 2-32: Recording control and replay based on web services

Systèmes de vidéosurveillance destinés à être utilisés dans les applications de

sécurité –
Partie 2-32: Contrôle d'enregistrement et lecture en fonction des services Web

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 13.320 ISBN 978-2-8322-7036-3

– 2 – IEC 62676-2-32:2019 © IEC 2019
CONTENTS
FOREWORD . 6
INTRODUCTION. 8
1 Scope . 9
2 Normative references . 9
3 Terms, definitions and abbreviated terms . 10
3.1 Terms and definitions . 10
3.2 Abbreviated terms . 11
4 Overview . 11
4.1 Interfaces . 11
4.2 Storage model . 12
4.3 Recording control . 13
4.4 Search . 14
4.5 Replay control . 14
4.6 Export file format . 14
4.6.1 Layout . 14
4.6.2 Use case 1: Playback of chunked and oversize clips at remote site . 15
4.6.3 Use case 2: Forensic analysis at court. 16
4.6.4 Use case 3: Playback at players not equipped according to the present
specification . 16
4.7 Receiver . 16
5 Recording control service . 16
5.1 Overview . 16
5.2 General requirements . 18
5.3 Data structures . 18
5.3.1 RecordingConfiguration . 18
5.3.2 TrackConfiguration . 18
5.3.3 RecordingJobConfiguration . 18
5.4 CreateRecording . 20
5.5 DeleteRecording . 21
5.6 GetRecordings . 21
5.7 SetRecordingConfiguration . 22
5.8 GetRecordingConfiguration . 22
5.9 CreateTrack . 23
5.10 DeleteTrack . 24
5.11 GetTrackConfiguration . 24
5.12 SetTrackConfiguration . 25
5.13 CreateRecordingJob . 25
5.14 DeleteRecordingJob . 26
5.15 GetRecordingJobs . 27
5.16 SetRecordingJobConfiguration . 27
5.17 GetRecordingJobConfiguration. 28
5.18 SetRecordingJobMode . 28
5.19 GetRecordingJobState . 29
5.20 GetRecordingOptions . 31
5.21 ExportRecordedData . 31
5.22 StopExportRecordedData . 32
5.23 GetExportRecordedDataState . 33

IEC 62676-2-32:2019 © IEC 2019 – 3 –
5.24 GetServiceCapabilities . 34
5.25 Events . 35
5.25.1 General . 35
5.25.2 Recording job state changes . 35
5.25.3 Configuration changes . 35
5.25.4 Data deletion . 36
5.25.5 Recording and track creation and deletion . 36
5.26 Examples . 37
5.26.1 Example 1: setup recording of a single camera . 37
5.26.2 Example 2: Record multiple streams from one camera to a single
recording . 38
6 Search service. 38
6.1 General . 38
6.2 Concepts . 39
6.2.1 Search direction . 39
6.2.2 Recording event . 39
6.2.3 Search session. 39
6.2.4 Search scope . 40
6.2.5 Search filters . 40
6.2.6 Time information . 40
6.3 Data structures . 40
6.3.1 RecordingInformation structure . 40
6.3.2 RecordingSourceInformation structure . 41
6.3.3 TrackInformation structure . 41
6.3.4 SearchState Enumeration . 42
6.3.5 MediaAttributes structure . 42
6.3.6 FindEventResult structure . 42
6.3.7 FindPTZPositionResult structure . 42
6.3.8 PTZPositionFilter structure . 42
6.3.9 MetadataFilter structure . 43
6.3.10 FindMetadataResult structure . 43
6.4 GetRecordingSummary . 43
6.5 GetRecordingInformation . 43
6.6 GetMediaAttributes . 44
6.7 FindRecordings . 45
6.8 GetRecordingSearchResults . 45
6.9 FindEvents . 46
6.10 GetEventSearchResults . 47
6.11 FindPTZPosition . 48
6.12 GetPTZPositionSearchResults . 49
6.13 FindMetadata . 50
6.14 GetMetadataSearchResults . 51
6.15 EndSearch . 52
6.16 GetServiceCapabilities . 53
6.17 Recording event descriptions . 53
6.18 XPath dialect . 54
7 Replay control . 55
7.1 Request replay URI . 55
7.2 ReplayConfiguration . 56

– 4 – IEC 62676-2-32:2019 © IEC 2019
7.3 SetReplayConfiguration . 56
7.4 GetReplayConfiguration . 56
7.5 GetServiceCapabilities . 57
8 Playback . 57
8.1 RTSP Usage . 57
8.2 RTSP describe . 58
8.3 RTP header extension . 58
8.3.1 General . 58
8.3.2 NTP timestamps . 59
8.3.3 Compatibility with the JPEG header extension . 59
8.4 RTSP feature tag. 60
8.5 Initiating playback . 60
8.5.1 General . 60
8.5.2 Range header field . 60
8.5.3 Rate-Control header field . 61
8.5.4 Frames header field . 61
8.5.5 Synchronization points . 62
8.6 Reverse replay . 62
8.6.1 Initiation . 62
8.6.2 Packet transmission order . 62
8.6.3 RTP sequence numbers . 64
8.6.4 RTP timestamps . 64
8.7 RTSP Keepalive . 65
8.8 Currently recording footage . 65
8.9 End of footage. 65
8.10 Go To Time . 65
8.11 Use of RTCP . 65
9 Export file format . 66
9.1 Required side information . 66
9.2 Timing . 68
9.3 Correction of start time . 68
9.4 Signature . 68
9.4.1 Preparing the signature input . 68
9.4.2 Generating the signature . 68
9.4.3 Include the generated signature in the file . 69
9.5 Repeated signing . 70
10 Receiver service . 71
10.1 General . 71
10.2 Synchronization points . 72
10.3 Persistence . 72
10.4 Receiver modes . 72
10.5 Receiver commands . 72
10.5.1 GetReceivers . 72
10.5.2 GetReceiver . 73
10.5.3 CreateReceiver . 73
10.5.4 DeleteReceiver. 73
10.5.5 ConfigureReceiver . 74
10.5.6 SetReceiverMode . 74
10.5.7 GetReceiverState . 75

IEC 62676-2-32:2019 © IEC 2019 – 5 –
10.6 GetServiceCapabilitites . 75
10.7 Events . 76
10.7.1 General . 76
10.7.2 ChangeState . 76
10.7.3 Connection Failed . 76
Annex A (informative) Repeated signing . 77
Annex B (normative) Schema files . 79
B.1 Recording control . 79
B.2 Search . 89
B.3 Replay control . 96
B.4 Receiver . 98
B.5 Common Schema . 102
Bibliography . 110

Figure 1 – Storage model with tracks . 13
Figure 2 – Sealing and examination in a nutshell (Source: Wikipedia) . 15
Figure 3 – Example of recordings and tracks . 17
Figure 4 – RecordingJobConfiguration structure . 19
Figure 5 – RecordingJobStateInformation structure . 30
Figure 6 – Recording state chart . 41
Figure 7 – Packet transmission during forward playback . 63
Figure 8 – Packet transmission during reverse playback . 64
Figure A.1 – Single signature box arrangement . 77
Figure A.2 – Repeated signature box arrangement . 77

Table 1 – Referenced namespaces (with prefix) . 12
Table 2 – Track configuration . 21
Table 3 – RTP packet layout . 58
Table 4 – RTP packet with JPEG header layout . 59

– 6 – IEC 62676-2-32:2019 © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
VIDEO SURVEILLANCE SYSTEMS FOR
USE IN SECURITY APPLICATIONS –

Part 2-32: Recording control and replay based on web services

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
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC
Publication(s)"). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62676-2-32 has been prepared by IEC technical committee 79:
Alarm and electronic security systems.
This first edition, together with IEC 60839-11-31 and IEC 62676-2-31, cancels and replaces
IEC 62676-2-3:2013.
This edition includes the following significant technical changes with respect to IEC 62676-2-
3:2013:
a) an export file format has been added.

IEC 62676-2-32:2019 © IEC 2019 – 7 –
The text of this International Standard is based on the following documents:
FDIS Report on voting
79/621/FDIS 79/623/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document 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.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document 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.
– 8 – IEC 62676-2-32:2019 © IEC 2019
INTRODUCTION
The goal of this document is to provide a fully interoperable network video recording and reply
implementation comprised of products from different vendors. This document describes the
network video recording model, interfaces, data types and data exchange patterns. The
document reuses existing relevant standards where available, and introduces new
specifications only where necessary to support the specific requirements for network video
recording and reply.
IEC 62676-2-32:2019 © IEC 2019 – 9 –
VIDEO SURVEILLANCE SYSTEMS FOR
USE IN SECURITY APPLICATIONS –

Part 2-32: Recording control and replay based on web services

1 Scope
This part of IEC 62676 specifies the web service interface for the configuration of the
recording of video, audio and metadata. Additionally, associated events are defined.
Clause 4 provides a definition of the storage model this document is based on.
Web service usage is outside the scope of this document. Please refer to the IEC 60839-11-
31 for more information
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.
IEC 60839-11-31:2016, Alarm and electronic security systems – Part 11-31: Electronic access
control systems – Core interoperability protocol based on Web Services
IEC 62676-2-31:2019, Video surveillance system for use in security applications – Part 2-31:
Live streaming and control based on web services
Internet Assigned Numbers Authority (IANA), Media Types, Media Types [online]. Edited N.
Freed et al. [viewed 2019-02-28]. Available at https://www.iana.org/assignments/media-
types/media-types.xhtml
INTERNET ENGINEERING TASK FORCE (IETF). RFC 2326: Real Time Streaming Protocol
(RTSP) [online]. Edited by H. Schulzrinne et al. April 1998 [viewed 2019-02-28]. Available at
http://www.ietf.org/rfc/rfc2326.txt
INTERNET ENGINEERING TASK FORCE (IETF). RFC 3280, Internet X.509 Public Key
Infrastructure – Certificate and Certificate Revocation List (CRL) Profile [online]. Edited by
Housley, et. al. April 2002 [Viewed 2019-02-28]. Available at http://www.ietf.org/rfc/rfc3280.txt
INTERNET ENGINEERING TASK FORCE (IETF). RFC 3550, RTP: A Transport Protocol for
Real-Time [online]. Edited by Schulzrinne, et al. Jul 2003 [viewed 2019-02-28]. Available at
https://www.ietf.org/rfc/rfc3550.txt
INTERNET ENGINEERING TASK FORCE (IETF). RFC 4055, Additional Algorithms and
Identifiers for RSA Cryptography for use in the Internet X.509 Public Key Infrastructure –
Certificate and Certificate Revocation List (CRL) Profile [online]. Edited by Schaad, et al. June
2005 [viewed 2019-02-28]. Available at https://www.ietf.org/rfc/rfc4055.txt
The World Wide Web Consortium (W3C). SOAP12-PART1, SOAP 1.2 – Part 1, Messaging
Framework [online]. Edited by M, Gudgin et al. Apr 2007 {Viewed 2019-02-28]. Available at
https://www.w3.org/TR/soap12-part1/

– 10 – IEC 62676-2-32:2019 © IEC 2019
The World Wide Web Consortium (W3C). XML-Schema 1, W3C XML Schema – Part 1:
Structures Second Edition [online]. Edited by H. Thompson et al. Oct 2004 [viewed 2019-02-
28]. Available at https://www.w3.org/TR/xmlschema-1/
The World Wide Web Consortium (W3C). XML-Schema 2, W3C XML Schema – Part 2:
Datatypes Second Edition [online]. Edited by P. Biron et al. Oct 2004 [viewed 2019-02-28].
Available at https://www.w3.org/TR/xmlschema-2/
The World Wide Web Consortium (W3C). XPath 1.0, XML Path Language (XPath) Version 1.0
[online]. Edited by J, Clark et al. Nov 1999 [Viewed 2019-02-28]. Available at
https://www.w3.org/TR/1999/REC-xpath-19991116/
Federal Information Processing Standard (FIPS), FIPS 180-4, Secure Hash Standard (SHS)
[online]. [viewed 2019-02-28]
Available at https://csrc.nist.gov/publications/detail/fips/180/4/final
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions 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 http://www.iso.org/obp
3.1.1
access unit
one or more frames or samples of audio, video, or metadata, which are contained in a group
of RTP packets having the same presentation time
3.1.2
certificate
data which binds a public key to a subject entity
Note 1 to entry: The certificate is digitally signed by the certificate issuer to allow for verifying its authenticity.
3.1.3
metadata
streaming data except video and audio, including video analytics results, PTZ position data
and other metadata (such as textual data from POS applications)
3.1.4
recording
container for a set of audio, video and metadata tracks
Note 1 to entry: A recording can hold one or more tracks. A track is viewed as an infinite timeline that holds data
at certain times.
3.1.5
recording event
event associated with a recording, represented by a notification message in the APIs

IEC 62676-2-32:2019 © IEC 2019 – 11 –
3.1.6
recording job
job that performs the transfer of data from a data source to a particular recording using a
particular configuration
3.1.7
signature
digital signature
digital signature scheme
mathematical scheme for demonstrating the authenticity of a digital message or document
3.1.8
track
individual data channel consisting of video, audio, or metadata
Note 1 to entry: This definition is consistent with the definition of "track" in IETF RFC 2326.
3.1.9
video analytics
algorithms or programs used to analyse video data and to generate data describing object
location and behaviour
3.2 Abbreviated terms
CCTV closed-circuit television
JPEG Joint Photographic Expert Group
PTZ pan tilt zoom
RTCP RTP control protocol
RTP real-time transport protocol
RTSP real time streaming protocol
SDP session description protocol
SHA secure hashing algorithm
TCP transmission control protocol
UDP user datagram protocol
UTC coordinated universal time
UTF Unicode Transformation Format
WSDL web service description language

4 Overview
4.1 Interfaces
This document provides a set of interfaces that enable the support of interoperable network
storage devices, such as network video recorders, digital video recorders and cameras with
embedded storage.
The following functions are supported:
• recording control;
• search;
• replay control.
These functions are provided by three interrelated services:

– 12 – IEC 62676-2-32:2019 © IEC 2019
Recording control service enables a client to manage recordings, and to configure the transfer
of data from data sources to recordings. Managing recordings includes creation and deletion
of recordings and tracks. The WSDL for this service is specified in Clause B.1
Search service enables a client to find information about the recordings on the storage
device, for example to construct a "timeline" view, and to find data of interest within a set of
recordings. The latter is achieved by searching for events that are included in the metadata
track recording. The WSDL for this service is specified in Clause B.2
Replay control service enables a client to play back recorded data, including video, audio and
metadata. Functions are provided to start and stop playback and to change speed and
direction of the replayed stream. It also enables a client to download data from the storage
device so that export functionality can be provided. The WSDL for this service is specified in
Clause B.3
This document also includes specification for:
• playback of recorded data;
• export file format;
• a receiver that acts as a RTSP client endpoint. The WSDL for this service is specified in
Clause B.4.
Table 1 lists the prefix and namespaces used in this specification. For interfaces defined by
this document, the respective annex is provided. Listed prefixes are not part of this document
and an implementation can use any prefix.
Table 1 – Referenced namespaces (with prefix)
Prefix Namespace URI Reference
env http://www.w3.org/2003/05/soap-envelope W3C SOAP12-PART1
ter http://www.onvif.org/ver10/error IEC 60839-11-31
trc http://www.onvif.org/ver10/recording/wsdl Clause B.1
trp http://www.onvif.org/ver10/replay/wsdl Clause B.3
trv http://www.onvif.org/ver10/receiver/wsdl Clause B.4
tse http://www.onvif.org/ver10/search/wsdl Clause B.2
tt http://www.onvif.org/ver10/schema Clause B.5
xs http://www.w3.org/2001/XMLSchema W3C XML-Schema-1
W3C XML-Schema-2
4.2 Storage model
The storage interfaces in this document present a logical view of the data on the storage
device. This view is completely independent of the way data might be physically stored on the
disk.
The key concept in the storage model is that of a recording. The term recording is used in this
specification to denote a container for a set of related audio, video and metadata tracks,
typically from the same data source, for example a camera. A recording could hold any
number of tracks. A track is viewed as an infinite timeline that holds data at certain times.
At a minimum, a recording is capable of holding three tracks, one for audio, one for video and
one for metadata. Some implementations of the recording service can support multiple tracks
of each type. For example, the same recording could hold two video tracks, one containing a
low-resolution or low-frame-rate stream and one containing a high-resolution or high-frame-
rate stream; see Figure 1.
IEC 62676-2-32:2019 © IEC 2019 – 13 –

Past Now
Video
Audio
Metadata
Audio backchannel
Recording 1
Video
Audio
Metadata
Audio backchannel
Recording 2
Video
Audio
Metadata
Audio backchannel
Recording 3
IEC
Figure 1 – Storage model with tracks
It is important to note that the storage interfaces do not expose the internal storage structures
on the device. In particular, a recording is not intended to represent a single file on disk,
although, in many storage device implementations, a recording is physically stored in a series
of files. For instance, some camera implementations realise alarm recording by creating a
distinct file for each alarm that occurs. Although each file could be represented as a different
recording, the intent of the model in this document is that all these files are aggregated into a
single recording.
Within a recording the regions where data is actually recorded are represented by pairs of
events, where each pair comprises an event when recording started and an event when
recording stopped. A client can construct the logical view of the recordings by using the
FindRecordings and FindEvents methods of the search service.
If metadata is recorded, the metadata track can hold all the events generated by the data
source, see Clause 10 of IEC 60839-11-31:2016 and 6.3.8 of IEC 62676-2-31:2019. In
addition, a device also conceptually records historical events as defined by this document
(see 6.17). Thi
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