ONVIF™ – 1 – ONVIF NVT Definition – Ver. 2.10
ONVIF™
Network Video Transmitter Device Definition
Version 2.1
June, 2011
ONVIF™ – 2 – ONVIF NVT Definition – Ver. 2.10
2008-2011 by ONVIF: Open Network Video Interface Forum. All rights reserved.
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ONVIF™ – 3 – ONVIF NVT Definition – Ver. 2.10
CONTENTS
1 Scope 4
2 Normative references 5
3 Terms and Definitions 5
3.1 Definitions........................................................................................................................5
3.2 Abbreviations ..................................................................................................................5
4 Overview 6
5 NVT Requirements (normative) 6
5.1 Services...........................................................................................................................6
5.2 Device Discovery ............................................................................................................7
5.2.1 Types ..........................................................................................................................7
ONVIF™ – 4 – ONVIF NVT Definition – Ver. 2.10
1 Scope
This document contains the definition for the ONVIF Network Video Transmitter device type.
This document describes the mandatory and optional services for this entity but does not
include the description of the services themselves. The services are described in separate
documents. Use the ONVIF Specification Document Map to locate the documentation for the
relevant services.
ONVIF™ – 5 – ONVIF NVT Definition – Ver. 2.10
2 Normative references
ONVIF Core Specification Version 2.1
ONVIF Device I/O Service Specification Version 2.1
ONVIF Media Service Specification Version 2.1
ONVIF Streaming Specification Version 2.1
ONVIF Imaging Service Specification Version 2.1
ONVIF PTZ Service Specification Version 2.1
ONVIF Video Analytics Service Specification Version 2.1
3 Terms and Definitions
3.1 Definitions
Network Video
Transmitter (NVT)
Network video server (an IP network camera or an encoder device, for example) that
sends media data over an IP network to a client.
3.2 Abbreviations
NVT Network Video Transmitter
ONVIF Open Network Video Interface Forum
ONVIF™ – 6 – ONVIF NVT Definition – Ver. 2.10
4 Overview
A Network Video Transmitter (NVT) is an ONVIF device that sends media data over an IP
network to a client. For example, an NVT may be an IP network camera or an encoder device.
An NVT exposes its functionality through a number of services that are provided by the
ONVIF standard. A number of services are mandatory for each type of ONVIF device. The
device may support other services and the device signals availability of optional services via
the device discovery service.
An NVT implements the following services to provide its core functionality:
Device service enables an NVT to provide device management functionality such as device
capabilities, system and network settings, security settings and firmware upgrade.
Event service enables an NVT to send events to clients.
Media service enables an NVT to stream media data to clients. Media data includes video,
audio, video analytics and other metadata.
Device IO service enables an NVT to support physical inputs and outputs.
An NVT can also implement the following services to provide extended functionality:
PTZ service enables an NVT to provide PTZ control if the device is a PTZ camera.
Imaging service enables an NVT to provide configuration of image settings which affect the
visual appearance of the video, for example, exposure time, gain and white balance, focus
control.
Video Analytics service enables an NVT to provide video analytics functionality.
Beyond this, an NVT can also include additional ONVIF services, for example the Recording
service if support for local storage is required.
5 NVT Requirements (normative)
5.1 Services
Table 1 shows which services are required for the NVT device type. Mandatory services are
marked with ‘M’ and services that are mandatory if a related feature is supported by the
device are marked with ‘C’. Optional services are marked with ‘O’.
Table 1: Service requirements for the NVT device type
Required?
Device M
ONVIF™ – 7 – ONVIF NVT Definition – Ver. 2.10
Event M
Media M
PTZ C
Imaging O
Video Analytics O
Device IO M
An NVT may include additional ONVIF services not shown in Table 1.
5.2 Device Discovery
An NVT shall implement device discovery as specified in the ONVIF Core Specification.
The basic capabilities and other properties of a device are defined by a number of scope
parameters. The NVT shall include the general scope parameters as defined in the ONVIF
Core Specification . In addition an NVT shall include the specific scope
parameters as presented in Table 2. Apart from these pre-defined parameters, it shall be
possible to set any scope parameter as defined by the device owner.
Scope parameters can be listed and set through the commands provided by the Device
service as defined in the ONVIF Core Specification.
Table 2: Scope parameters
Category Defined values Description
video_encoder A video_encoder scope indicates that this device is a
network video encoder device. A device with network
video support, shall include the video_encoder type in its
scope list.
ptz A ptz scope indicates that the device is a ptz device. A
device with PTZ support shall include a scope entry with
this value in its scope list.
audio_encoder The audio_encoder scope indicates that this device is an
audio encoder and a device with audio encoder support
shall include a scope entry with this value in its scope list.
video_analytics The video analytics scope indicates that this device
supports video analytics as defined in .
A device with video analytics support shall include a
scope entry with this value in its scope list.
type
Network_Video_Transm
itter
The network video transmitter scope indicates if the
device is an NVT compliant device. An NVT shall include
a scope entry with this value in its scope list.
5.2.1 Types
Section “Discovery definitions” of the ONVIF Core Specification defines a generic tds:Device
for the Types declaration.
For backward compatibility reason an ONVIF compliant NVT shall also include
dn:NetworkVideoTransmitter in the declaration.
1 Scope
2 Normative references
3 Terms and Definitions
3.1 Definitions
3.2 Abbreviations
4 Overview
5 NVT Requirements (normative)
5.1 Services
5.2 Device Discovery
5.2.1 Types
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