Datavideo NVS25 User guide

H.264 Network Video Streaming Server

NVS-25

Contents

Warnings and Precautions ____________________________ 5

Warranty __________________________________________ 6

Standard Warranty ______________________________________ 6

Two Year Warranty ______________________________________ 6

Disposal ___________________________________________ 6

1. Product Overview ______________________________ 7

1.1 Features __________________________________________ 7

2. Front Panel ____________________________________ 8

3. Rear Panel ____________________________________ 9

4. System Diagram_______________________________ 10

5. NVS-25 Network Video Streaming Server Setup _____ 11

5.1 Connect live video and audio to NVS-25 _______________ 11

5.2 Connect NVS-25 to the local IP network _______________ 11

5.3 Connect power to NVS-25 __________________________ 11

5.4 Select the input connection to be streamed ___________ 11

6. How to find the NVS-25 on an IP network __________ 12

6.1 How to use the NVS25 IP Finder utility software ________ 12

6.2 Use the NVS25 IP Finder utility software to search a
different network ______________________________________ 14

7. NVS-25 login using a web browser ________________ 15

7.1 Default Login Details ______________________________ 15

7.2 Live Option ______________________________________ 16

7.3 Record Option ____________________________________ 16

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7.4 Status Option ____________________________________ 16

7.5 Settings Option ___________________________________ 16

8. Setting > Live Stream Setup - Protocols ____________ 17

8.1 HLS Protocol _____________________________________ 17

8.2 RTSP Protocol ____________________________________ 17

8.3 RTMP Protocol ___________________________________ 17

8.4 Stream Server Selection ____________________________ 17

8.5 RTMP Publish URL ________________________________ 19

9. Setting > Encoder Setup ________________________ 21

9.1 Input Source Selection _____________________________ 22

9.2 Video Tuning _____________________________________ 22

9.3 Image Size _______________________________________ 23

9.4 H.264 Encode ____________________________________ 23

9.5 Group of Pictures _________________________________ 24

9.6 Video Bitrate/Mode _______________________________ 26

9.7 Audio Setup ______________________________________ 28

10. Setting > Network Setup ________________________ 29

10.1 DHCP Enable ___________________________________ 29

10.2 DHCP Disable ___________________________________ 29

11. Setting > Firmware Update ______________________ 30

12. Setting > Account Setup ________________________ 31

13. Setting > Restore Default _______________________ 32

Restore Factory default via STM button ____________________ 34

14. Recording the stream to USB 2.0 media ____________ 34

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15. Status > Device Information _____________________ 34

15.1 USB Storage Information _________________________ 34

15.2 Stream Information ______________________________ 35

16. Streaming Examples ___________________________ 36

16.1 HTTP Live Streaming (HLS) Protocol _________________ 36

16.2 Real Time Streaming Protocol (RTSP) _______________ 37

16.3 Real Time Messaging Protocol (RTMP) ______________ 38

16.3.1 NVS25-USTREAM Connection Configuration ____________ 40

16.3.2 NVS25-WOWZA Server Connection Configuration _______ 41

16.3.3 NVS25-Youtube Connection Configuration _____________ 43

17. Port Forwarding on your Firewall / Router _________ 49

18. LED Status & Button Behaviour __________________ 49

18.1 LED Status _____________________________________ 49

18.2 Button Behaviour _______________________________ 50

19. Frequently-Asked Questions _____________________ 50

20. Specifications _________________________________ 51

Service & Support __________________________________ 52

Disclaimer of Product & Services

The information offered i n this instruction ma nual is intended as a g uide only. At all
times, Datavideo Technologies will try to give correct, complete and suitable information.
However, Datavideo Technologies cannot e xcl ude t hat so m e inform at io n in t hi s m a nual,
from time to t ime, may not be corr ect or ma y be incom plete. Thi s manual may contain
typing errors, omissions or incorrect information. Datavideo Technologies always
recommend that you do uble check t he informat ion in this docume nt for acc uracy bef ore
making any purchase decision or using the product. Datavideo Technologies is not
responsible for a ny omissio ns or errors, or f or any sub sequent lo ss or damage caus ed
by using the informat ion contained w ithin this ma nual. Further ad vice on the cont ent of
this manual or o n the product can be ob tai ned b y co ntacting y o ur local Datavideo Off ice
or dealer.

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Warnings and Prec aut ions

1. Read all of these warnings and save them for later reference.

2. Follow all warnings and instructions marked on this unit.

3. Unplug this unit from the w all outlet bef ore clea ning. Do not use liquid or a erosol
cleaners. Use a damp cloth for cleaning.

4. Do not use this unit in or near water.

5. Do not place this unit on an unstable cart, stand, or table. The unit may fall,
causing serious damage.

6. Slots and openings on the cabinet top, back, and bottom are provided for
ventilation. To ensure safe and r el iab le oper at ion of this unit, a nd to pro tec t it f rom
overheating, do not block or cover these openings. Do not place this unit on a bed,
sofa, rug, or similar surface, as the ventilation openings on the bottom of the
cabinet will be blocked. This unit should never be placed near or over a heat
register or radiator. This unit should not be placed in a built-in installation unless
proper ventilatio n is provided.

7. This product should o nly be operated f rom the type of power source ind icated on
the marking label of the AC adapter. If you are not sure of the type of power
available, consult your Datavideo dealer or your local power company.

8. Do not allow anyt hing to re st on the pow er cord . Do not l ocate thi s unit w here the
power cord will be walked on, rolled over, or otherwise stressed.

9. If an extension co rd must be used with this unit, make sure that t he total of the
ampere ratings o n the pr od ucts p lugged i nto t he extension cord do not e xceed t he
extension cord’s rating.

10. Make sure that the total amperes of al l the uni ts that are plugged into a s ingl e wa ll
outlet do not exceed 15 amperes.

11. Never push obj ects of a ny kind into this unit throug h the cabinet ventilation slots,
as they may to uch dangero us voltage po ints or s hort o ut parts that c ould re sult in
risk of fire or electric shock. Never spill liquid of any kind onto or into this unit.

12. Except as specifically explained elsewhere in this manual, do not attempt to
service this product yourself. Opening or removing covers that are marked “Do Not
Remove” may expo se yo u to da nger o us vo ltage po i nts or ot her ri sks, and will void
your warranty. Refer all service issues to qualified service personnel.

13. Unplug this prod uct from the wall outlet and refer to q ualified service personne l
under the following conditions:

a. When the power cord is damaged or frayed;
b. When liquid has spilled into the unit;
c. When the product has been exposed to rain or water;
d. When the product does not operate normally under normal operating

conditions. Adjust only those controls that are covered by the operating
instructions in this manual; improper adjustment of other controls may result in
damage to the unit and may often require extensive work by a qualified

technician to restore the unit to normal operation;
e. When the product has been dropped or the cabinet has been damaged;
f. When the product exhibits a distinct change in performance, indicating a need

for service.

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Warranty

Standard Warranty

• Datavideo equipm ent is guaranteed against any manufactur i ng def ects f or o ne year

from the date of purchase.

• The original p urc hase invoice or ot her documentary evid ence should be suppl ied at

the time of any request for repair under warranty.

• Damage caused by acc ident, misuse, unauthorized repairs, sand, grit or water is

not covere d by this warranty.

• All mail or transportation costs including insurance are at the expense of the owner.

• All other claims of any nature are not covered.

• Cables & batteries are not covered under warranty.

• Warranty only valid within the country or region of purchase.

• Your statutory rights are not affected.

Two Year Warranty

• All Datavideo products purchased after 01-Oct.-2008

qualify for a free one year extension to the standard
Warranty, providing the product is registered with
Datavideo within 30 day s of purchase. For informat ion on
how to register p lea se visit w ww.datavideo.com o r contact
your local Datavideo office or authorized Distributors

• Certain parts with limited lifetime expectancy such as LCD Panels, DVD Drives,

Hard Drives are onl y cover ed f or t he fir st 10,000 ho urs, o r 1 year (w hic he ver com e s
first).

Any second year wa rra nt y c laim s m ust be m ade to your local Datavideo office or o ne of
its authorized Distributors before the extended warranty expires.

Disposal

For EU Customers only - WEEE Marking

This symbol on t he prod uct indicate s that it will not be t reated as
household waste. It must be ha nded over to t he applicable tak e
back scheme for t he recycli ng of Waste Elect rical and E lectronic
Equipment. For more detailed informatio n about the rec ycling of
this product, please contact your local Datavideo office.

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1. Product Overview

NVS-25 is a broadcast qua lity H.264 network stream ing server. This unit serves the
purpose of sharing HD or SD video over local or glob al IP network s. Equipped with
HDMI, SDI and Composite Video interfaces, NVS-25 is designed for live event
streaming at up to 6Mbps. NVS-25 supports the following streaming protocols:

• HLS [HTTP Live Streaming]

• RTP / RSTP

• RTMP [Local/Publish]

NVS-25 can be set up and controlled using almost any device s with a web browser.
Users are allowed to co nfigure real time audio a nd video streaming o n the web-based
graphical user interface. The encoded video stream can be delivered to a single
browser, a group of clie nts on a Local Area N etwork (LA N) or even a C ontent De livery
Network (CDN).

The Core Value of Datavideo, sharing the value!

1.1 Features

• Broadcast quality HD / SD H.264 network streaming

• Quick and easy setup

• H.264 Encoding

Video Inputs - Choose from:

• HD / SD-SDI [BNC]

• HDMI

• CVBS [BNC]

Audio Inputs:

• Unbalanced RCA Phono sockets

• or

• Balanced 3pin XLR

Encoded Video Stream :

• H.264 / AVC up to High Profile Level 4.0

• Up to 1920x1080 @ 30 fps

• Configurable bitrate up to 6Mbps

Control

• Web user interface for configuration and control

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Power On/Off Switch
USB

Mode Selec t

RECORD

Login Details).

NVS-25

2. Front Panel

8

Switches the power On / Off

USB 2.0 interface for connecting external storage

Mode Button - Selec t Input source bet wee n
CVBS / SDI / HDMI.

REC – Displays the recording status
STM – Displays the stream server status
PWR – Displays the power status
See the section on LED Status & Button Behaviour

Turns ON/OFF the recording feature

STM

Turns ON/OFF the network streaming feature
Note: Before using t his butt o n, the user s ho uld first make sure

the network and stream settings are properly configured.

Restore f a c t ory defaults fr om t he f ront panel.

From power off. Press and hold the STM butto n and turn on
the NVS-25 power; keep holding the STM button for 70

seconds and rele ase only after seeing all the fr ont panel
LEDs start flashing. When released, the NVS-25 w ill take a

further 30 sec onds to finish the boot-up proces s. Remember
to login with the default username and password (Default

3. Rear Panel

H.264 Network Video Streaming Server

NVS-25

AUDIO IN (X LR)

Supports two channels XLR Balanced Audio Input.

AUDIO IN (RCA)

RCA stereo for a line level auxiliary analogue audio source,
such as a CD player or tape deck . If you are using m ore than
two sources via an external audio mixer, connect the audio
mixer’s line level output to this unbalanced audio input.

HDMI IN

HDMI digital signal input connector.

CVBS IN

Composite video input: takes a BNC connector from the
composite output of a VCR, camera, DVD player, etc.

SDI IN

BNC connector for SDI input.

Ethernet Port (RJ-45)

10/100M base Ethernet Network interface

DC In Socket

Connect the suppl ied 12V PSU to this sock et. The connectio n
can be secured by screw ing the outer f astening ri ng of the DC
In plug to the socket.

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4. System Diagram

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5. NVS-25 Network Video Streaming Server Setup

The NVS-25 is designed to act as an interface between video source equipment and the
IP network as depicted in the System Diagram.

5.1 Connect live video and audio to NVS-25

Refer to Rear Panel section for co nnection of your live video a nd audio so urce cabling
to the rear panel of the NVS-25.

5.2 Connect NVS-25 to the local IP network

Refer to Rear Panel for connection of the NVS-25 to the local IP network via RJ-45
Ethernet cable. The l ocal IP netw ork could be from an office LAN f ace plate on t he wall
or an existing LAN network router / switch.

5.3 Connect power to NVS-25

The NVS-25 comes with its own power supply unit which is plugged into a normal
wall/power outlet. The device can also receive power from Datavideo’s PD-2 power
distribution unit. PWR LED indicator on the f ront panel of the NV S -25 sho uld be fla shing
red after being switched on. It take s approximately one minute for the unit to start and
the boot-up process is complete when PWR LED indicator turns to constant green.

5.4 Select the input connection to be streamed

The MODE b utton on the fro nt panel o f the NVS-25 is used to select the live video input
connected to the rea r of the unit. Press this button to cycle throug h HDMI, SDI and
Composite [CVBS].

Each time the button is pressed, an LED will be lit for the selected source. The default at
power on is HDMI. If no source video is detected, t he LED will be flashing red. If a live
video source is detected, the LED will be changed to solid green.

The STM or stream LED will become solid green once the unit is correctly configured by
IP connected computer.

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6. How to find the NVS-25 on an IP network

As illustrated in the System Diagram , the NVS-25 is designed to act as an interface
between video source equipme nt and the IP network.

By default, the NVS-25 will try to obtain an IP Address from the DHCP network
server once physical network connection has been established. This can be later
changed to True Stati c IP mode if required.

6.1 How to use the NVS25 IP Finder utility software

Datavideo provides a free, Windows
based utility, called NVS-2X IP Finder.

You need to make sure that IP Finder
Utility will not be b locked by computer firewall o r anti-virus software the first tim e the
utility is run on the computer. The utility must be ab le to scan or search the loca l network.

After ope ning the NVS-25 IP Finder Ut ility, the computer IP address is displayed i n the
“Local IP Address” pull-down menu of the utility window. Make a note of the IP
Address for the computer.

When the util ity scans t he LAN that the com puter is c onnected t o, it w ill displa y the IP
and MAC addresses of all the NVS-25 units found on this local area network. Make a
note of the NVS-25 IP Address. In this case, the IP address of the NVS-25 is

192.168.1.100. However, please note that the actual IP address may differ from the
example shown below.

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If your computer has two Ethernet cards which are respectively connected to two
different network domai ns, by clicking the “Loc al IP Address” pull-d own m en u, yo u wi ll
then be able to select t he network t hat you wo uld l ike to s can. In t he examp le bel ow, we
have selected the 192.168.0.X network. The IPs shown are IPs of the Ethernet cards.

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If you are using an App le computer t hen you can use an alternative utility app such as
Fing or Network Analyzer Lite.

6.2 Use the NVS25 I P Fin der utility software to search a dif f erent network

The NVS-25 IP finder allows the user to search for the NVS-25 device which is
connected to a different network from which the computer terminal is connected to.

To use the NVS-25 IP finder to searc h a different network, simpl y enter the IP of t he
NVS-25 installed on anot her network into the “ Local IP Address” pull-down menu as
shown in the diagram below. Click on the “Scan” button and once the NVS-25 device is
found, the IP finder will display the IP and MAC addresses of the device found. However,
before you do t his, co nsult yo ur loca l network a dm inistra tor or IT departme nt for proper
network configuration (bridging two different network domains).

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7. NVS-25 login using a web browser

By now, we have obtained the IP addresses of the computer a nd the NVS-25. If both
devices are ass igned t he IP addr e sse s wit h the same network prefix, we should be able
to use any web browser to login and configure the NVS-25.

Compatible brow sers such as Google Chrome, Firefox, Opera or e ven Safari can be
used. Please note that Internet Explorer can also be used, but you may need to
enable compatibility view and pop-up windows on the browser first.

Type the NVS-25 IP address into t he browser address bar. Remember to inc lude the
dots between the f our octets. After hitting t he “enter” ke y, you will then be prom pted to
enter the login information on a pop-up window.

7.1 Default Login Details

All NVS-25 unit s are delivered from t he factory with th e same default user name and
password. This can be changed at a later stage to suit your needs.

Username = admin Password = 000000 [Six Zeros]

Please refer to Account Setup section for instructions on how to change the default login
information.

Once we are logged into NVS-25, w e will be aut omatical ly directed to t he Home Pag e
shown below. Four options are available o n t his page: L i ve, R ecord, Status and Settings.

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7.2 Live Option

On the Live opt ion page, the user can retr ieve live video stream link and e nter the l ink
into a video s treaming appl ication such VLC playe r or view the live video stream on a
local area network. Please refer to Live Stream Setup section for more information.

7.3 Record Option

On the Record o ption page, the NVS-25 can be config ured to connect to an external
USB 2.0 hard dr ive or pen d rive. W hen the USB st orage de vice is connec ted, NVS-25
can then record video to t he device. The rec ording time is depende nt on the rec ording
bit rate and the free space a vailab le on the U SB de vice. Please ref er to R ecord Optio n
for more information.

7.4 Status Option

The Status Option displays the current stream settings in use.

7.5 Settings Option

Six setting options ca n be checked on this page:

• Live Stream Setup

• Encoder Setup

• Network Setup

• Firmware Update

• Account Setup

• Restore Default

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8. Setting > Live Stream Setup - Protocols

It is always preferable to decide what stream setti ng best matc hes your purpo se of use
as well as the network and protocol before streaming video via the NVS-25.

8.1 HLS Protocol

Use the NVS-25 to feed IP video stream to several Ap ple comp uter clients or tablet
computers such a s iPad, iPhone or MacBook r unning Saf ari browser. HLS feeds video
and audio streams to the iOS devices. Note t hat, depending on t he settings c hos en,

HLS latency may be up to 10 seconds in case of live events.

8.2 RTSP Protocol

Use the NVS-25 to feed IP video stream [TCP , HTTP] to a small gro up of clients on a
Local Area Ne twork (LAN) or Wide Area N etwork (WAN). The user can the n view the
video via free client software such a s VLC Player. However RTSP does not work well
with some tablet computers. RTSP is open for viewing by anyone on the same
network with the streaming details or link. It can be sent across t he i nter net, but eac h

client add ed will add data loa ding to the NVS-25, as each video stream is set up
individually for eac h client. RTSP has a limitatio n of three viewing clients bef ore the

NVS-25 becomes congested and video stream f ails.

8.3 RTMP Protocol

Use the NVS-25 to deliver a single IP video stream [TCP ] to a server on a Wide Area
Network [WAN] like the internet (RTMP Publish) or to a small group of clients on a
private Local Area Network [LAN] (RTMP Local).

The server on t he WAN could be the server of a Content Delivery Network [CDN],
suc h as Ustream. To use a CDN, you ma y need to reg i ster f or a f ree / trial account with
additional costs first. The user just need to deliver one video stream to the CDN and that
IP video feed will be shared am ong m ultiple viewer s. Thi s means less work for you and
the NVS-25 as well. CDNs differ in tariffs and the wa y they operate so it is be st to do

your homework beforehand.

The server on a W AN could a lso be y o ur ow n Wowza server. Wowza server i s a not her
form of C DN solution, typically for large organiz ations, where yo u brand the look a nd
feel of the delivery network plus the video stream itself. Again it is bes t to do your

homework bef or e ha nd.

8.4 Stream Server Select i on

This pull-down menu allows you to either select one of three transmission protocols
[HLS, RTSP (TCP, HTTP), RTMP (Loca l, Pub lish)] or sw itch off the curre nt vide o stream .
The default is stream off.

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After the preferable stream server is selected, the user can also enable the Stream
Schedule funct ion by c hecki ng t he “Enable Schedule Stream” box and then select t he
time to the first stream time as well as its cycle.

The “ First Time” opti on allows you to select the time to the first stream time. Select
number of days f rom the first pull dow n menu, number of hours from the second p ull
down menu and number of minutes from the third p ull down menu. Fo r example, if the
current time is 09:57 on Wednesday and the scheduled stream time is 12:00 on
Saturday, you should select 3 Days f rom the first pull down menu, 2 Hours from the
second pull down menu and 3 Minutes from the third pull down menu.

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The “ Repeat E very” optio n gives the user the ability to set the f requenc y of t he stream
after the stream time is d etermined. Again, se lect number of m onths from the first p ull
down menu, number of days from the sec ond pull down menu a nd number of hours
from the third pull down menu. For example, if you would like to repeat the stream every
12 hours, simply click the second pull down menu and select 12 Hours.

After all settings are determined, click the Apply button.
NOTE: All settings applied will not be in effect unless the Apply button has been clicked

and the NVS-25 configuration progress bar indicates 100% completion.

The user can also enable “Auto stream at startup” so that the original settings persist
through the power cycle process.

8.5 RTMP Publish URL

Two options and four text bars will appear w hen RTMP Publis h is selected under the

Stream Server Selection Option. Enable the desired options and enter the
corresponding information to stream your video to your Content Delivery Network.

• Audio Only: Check to enable Audio Only streaming (Enable Pattern
Generator accompanying this setting; Pattern Generator generates color

bars when video signals are absent and can be enabled in Encoder Set up

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under the Settings Option)

• Anevia Server: Check to enable Anevia Server if the traditional publish
method fails. Once enabled, the maximum video bitrate is 3Mbps.

• RTMP URL: E nter the RTMP P ublish URL f or your WAN-based server or
CDN account

• RTMP Stream: Name of the streaming video

• RTMP Username: Username of CDN account

• RTMP Password: Password of CDN account

If you wish to view the RTMP stream direct l y from the NVS-25 o n the loca l area network
(LAN) using the Live option, select RTMP Local option.

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Input Source Selection

HDMI / CVBS / SDI

Video Tuning

Brightness / Contrast / Hue / Saturatio n / Shar p ness 0
~ 255

Scale Down

1280x720 / 720x576 / 720x480

H.264 Encode

Main 3.0 / Mai n 3.1 / Hig h 4 .0

GOP Structure

IBBP / IPPP / IBP

GOP Size

6 / 7 / 8 / 9 / 10 / 11 / 12 / 13 / 14 / 15 / 16 / 17 / 18 / 19 /

59 / 60 / 61 / 62

Video Bitrate (Kbps)

800 / 900 / 1000 / 1500 / 2000 / 2500 / 3000 / 3500 / 4000
/ 4500 / 5000 / 5500 / 6000

Video Rate Mode

CBR / VBR

Audio Stereo

Stereo / Mono

9. Setting > Encoder Setup

NVS-25

On any video streami ng device, the encoder p lays a crucial role in the e ntire system.
The NVS-25 provides the user with several configurable parameters as listed in the
table below. The following sub-sections will provide details of each parameter.

20 / 21 / 22 / 23 / 24 / 25 / 26 / 27 / 28 / 29 / 30 / 31 / 32 /
33 / 34 / 35 / 36 / 37 / 38 / 39 / 40 / 41 / 42 / 43 / 44 / 45 /
46 / 47 / 48 / 49 / 50 / 51 / 52 / 53 / 54 / 55 / 56 / 57 / 58 /

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Stereo Bitrate (Kbps)

64 / 96 / 112 / 128 / 160 / 192 / 224 / 256 / 320 / 384

Audio Source

DIG / RCA / XLR

Analog Audio System

EBU / SMPTE

NVS-25

9.1 Input Source Selection

This pull-down menu allows you to switch between physical video inputs, HDMI, CVBS
and SDI, located o n the rear panel of NVS-25. The default is HDMI. Please note t hat
you will not be able to use Video Tuning if SDI is selected.

9.2 Video Tuning

For HDMI and CV BS inputs, set video brightness, co ntrast, hue and saturation on the
NVS-25. SDI video is usually adjusted on the so urce equ ipment before it is de livered to
the NVS-25. The values of brightnes s, co nt ra st, hue a nd saturation ra nge from 0 to 255
with the default programmed to 128.

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Original Resolution

Downscaled Resolution

1920x1080

1280x720, 720x567, 720x480

1280x720

720x576, 720x480

720x576

720x480

NVS-25

9.3 Image Size

The first step of encoder setup is to adjust the image size. The NVS-25 al lows you to
downscale the out put image and set the SD a spect ratio at the input. The Scale Dow n
function, as the name suggests, allows the user to shrink the image size. The table
below shows all possible downscaled resolutions on NVS-25.

9.4 H.264 Encode

The H.264 standard can be viewe d as a "family of standards" composed of different
profiles. A specific enc oder encodes at lea st one, but not nece ssarily all profile s. The
NVS-25 offers the user three profile s: M ain P rof ile 3.0, M ai n Profile 3.1 and H igh P rofile

4.0.

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Main Profile

The ‘Main’ or Mainline Profile i nclude s support f or i nter laced v ideo, i nter -cod ing us ing B ­slices, inter coding using weighted prediction and entropy encodin g using c ontext-based
adaptive binary arithmetic coding (CABAC). Ideal application of the Main Profile
includes long term video arc hival storage a nd standard-definition dig ital TV broadcasts
that use the MPEG-4 format as defined in the DVB standard.

High Profile
The High Profile is used as the pref erred choice for HD broadca st and disc storage
applications, adopted by the Blu-ray Disc storage format and DVB HDTV broadcast
service.

9.5 Group of Pictures

H.264/MPEG-4 AVC (Advanced Video Coding) is a comm on video stream compre ssio n
method. It elimi nates redundant video information within a f rame known as intraframe
compression as well as o ver a period of time known as interframe com pression. The
two compression techniques are described as follows:

• Intraframe compression (Spatial Compression): a compression technique
applied to informat ion contai ned only withi n the curre nt frame, creati ng video
frames called I-frames

• Interframe compre ssion (Temporal Compression): a compression tec hnique
applied to a sequence of video fram es, rat her tha n a single image; i nstead of
storing complete f ram es, only c hanges from one f rame to t he ne xt are store d
in order to reduce the amount of data needed to be stored while still achieving
high-q ua lit y images.

H.264/MPEG-4 AV C uses the two above-mentioned co mpression technique s, whereby
three types of compressed f ram es described a s follows are ge nerated a nd organized in
a group of pictures, or GOP.

• I-frame: Intra (I) fram es, also known as reference or key frames, co ntain all
the necessary data to re-create a complete image.

• P-frames: Predicted (P) fram es are e ncoded f rom a “p redicted” p icture based
on the closest preceding I- or P-frame.

• B-frames: Bi-directionally (B) predicted frames are encoded based on an
interpolation from I- and P-frames that come before and after them.

The Group of Pictures (GOP) structure specifies the order in which intra- and inter­frames are arranged. A ll three frame types do not have to be used in a patt ern. The
typical GOP structure is IBBPBBP. The I-frame is used to predict t he first P-frame and
these two fram es are a l so used to predict the first and t h e second B -f ram e. T he seco nd
P-frame is predicted us ing the first P-fram e and they j oin to predict the t hird and fourt h
B-frames.The relationship between I-frame, P-frame, and B-frame is illustrated
diagrammatically below.

24

H.264 Network Video Streaming Server

I

B

P

P

B

B

B

NVS-25

The GOP structure is often referred b y the GOP size, which is defi ned as a distance
between two full images. For example, in a sequence with pattern
IBBPBBPBBPBBIBBPB…, the GOP size is equal to 12 (length between two I frames).

The N VS-25 off ers the user three type s of GOP structure: IBBP, IPPP and IBP. Note:
Sinc e B -f rame is predicte d based on I a nd P frames, a GOP cannot e nd with a B-frame
because if B-frame is used as a reference for making further prediction, a growing
propagation error will result.

GOP pattern with longer GOP length encodes video very efficiently. Shorter GOP
lengths usually work better with video that has quick movements, but they do not
compress the data rat e as m uch. O n the NVS -25, there are 57 GOP sizes available for
the user, ranging from 6 to 62.

25

H.264 Network Video Streaming Server

NVS-25

9.6 Video Bitrate/Mode

The bitrate of the video specifies the amount of i nformation stored in the video. The
higher the bitrate is, the clearer the video is. For example, SD video may appear
acceptable at 1000 Kbps but HD video is unacceptable at 1000 Kbps. The NVS-25
converts video into data, which are sent acro ss an IP network. H igh bitrates consume
more bandwidth acro ss the IP network. In a g igabit office LAN, bitr ate may not be a
concern. Speed/Bandwidth is the limitation in a NVS-25 application en vironment.

The bitrate ranges from 800 to 6000 Kbps as shown in the diagram below.

26

H.264 Network Video Streaming Server

Bitrate (Kbps)

Video Format

800

480/576i

900

480/576/720p

1000 or higher

480/576/720p, 1080i, 1080p

NVS-25

Please note the following limitations as some video bitrates work with certain video
formats only.

The N VS -25 also offers two bitrate m odes, Variable Bitrate (VBR) and Cons tant Bitrate
(CBR). Set the NVS-25 to VBR to efficiently send video data across a n IP network but
there is also a t rade-off agai nst video qualit y. CBR pro vides better video quality but is
less data and bandwidth efficient when sent across an IP network.

27

H.264 Network Video Streaming Server

NVS-25

9.7 Audio Setup

Audio Sour ce ca n b e f ed into the NVS-25 in two ways. One way is to embed audio into
digital video stream suc h as HDMI and SD I [DIGITAL] and another wa y is to feed audio
into a separate a nalog XLR/RCA phono inputs [A nalog]. Select your audio source first
as shown in the diagram below.

Since analog audio levels of the standards in EBU and SMPTE regions are different,
thus audio standard option also needs to be taken into consideration. The audio
standard settings can be found under the Analog Audio System Menu.

NOTE: All settings applied will not be in effect unless the Apply button has been clicked
and the NVS-25 configuration progress bar displays 100% completion.

28

H.264 Network Video Streaming Server

NVS-25

10. Setting > Network Setup

On the Network Set up page, the us er is able t o config ure t he basic network settings on
the NVS-25. The two available m odes are DHCP a nd True Static. In DHCP mode, the
NVS-25 is randomly assi g ned an IP addres s. In True Static mode, t he user is a llowe d to
assign a fixed IP add re ss to the NVS-25. Please note that i n a non-DHCP environment,
the user is allowed to reset the NVS-25, which will then be assigned a default IP
address of 192.168. 1.20. For i nstr uctio ns o n how t o re set the device, please ref er to the
“Restore Default” section.

10.1 DHCP Enable

If DHCP mode is enabled, NVS -25 wil l attempt to obtain an IP address automaticall y
from the DHCP server upon connection to an office LAN or the router. IP address
obtained in DHCP mode cha nges e ver y time when NVS-25 is p ower cycl ed. The IP
address assigned to NVS -25 has the same network pref ix as the office network or the
router. Please refer to t he IP finder sec tion for more infor matio n on how to l ocate

NVS-25 on a DHCP network.

10.2 DHCP Disable

If DHCP mode is disabled, NVS-25 will be set to Tr ue Static mode. A true static IP
address does not change even after the unit is power cycled. This allows NVS-25 to

be easily located on the network.
If you wish to work in tr ue static m ode on your off ice network, p lease consult your loca l

network administrator or IT support for a dvice. They are al so able to confirm the IP
address of the Default Gateway.

The network setting s hould persi st through the firm ware upgrade proc ess. Plea se refer
to the Firmware Upgrade section for the process.

29

H.264 Network Video Streaming Server

NVS-25

11. Setting > Firmware Update

Datavideo usually re lea ses new f irmware c ontaini ng new f eatures o r report ed b ug fixes
from time to t ime. Customers ca n e ither download the N VS -25 f irm ware a s t he y wi sh o r
contact their local dealer or reseller for assistance.

This section out lines the firmware upgrade proc ess which should take approximately
10 minutes to complete.

The existing NVS-25 settings should persist through the firmware upgrade
process, which sh ou ld no t b e interr up ted once star t e d as this could result in a non-

responsive unit.

Successful firmwar e upgrade on NVS-25 requires:

 The latest firmware file, which can be obtained from your local Datavideo

dealer or office.

 A computer with web browser on the same IP network as the NVS-25.
 The current NVS-25 IP address and settings.

1. Log into the NVS-25 server on the computer web browser.

2. Click on Settings Tab a nd turn Stream OFF under Stream Server Option; click
on apply.

3. Select Firmware Update and Browse to the latest firmware file.

4. Click on the Start button to upgrade the NVS-25 to the latest firmware.

Note: Af ter f irmware upgrade, you m ay need t o re-locate the NVS-25 o n the network ;
please refer to the section on How to find NVS-25 on an IP network for further
instructions. Settings of the unit need to be restored to settings prior to firmware
upgrade.

30

H.264 Network Video Streaming Server

NVS-25

12. Setting > Account Setup

The NVS-25 has a default admin account and password. This account has access to
the NVS-25 login credential and stream settings.

Default username = admin Default password = 000000 [Six Zeros]

This section outlines steps to changing the above default username and password to a
more secured login credential.

1. Log into the NVS-25 server on the computer web browser.

2. Click on Settings Tab a nd t urn Stream OFF under Str eam Server Option; click
on apply.

3. Click on Account Setup and enter the current username and password.

4. The user will then be prom pted to enter the new log in credential agai n. Enter the
new password twice to confirm.

5. After clicking on “a pply change”, the user will be prom pted to re-lo gin w ith n ew
login credential.

NOTE: Please keep the new login credential in a safe place as the old/default
login credential is usual ly de lete d during this process .

31

H.264 Network Video Streaming Server

NVS-25

13. Setting > Restore Default

Settings on the NVS-25 are usually changed many times, and this function is used when
you wish to restore your factory default settings.

NOTE: This feature w ill also reset the NVS -25 login credential to t he default user name
and password (admin/000000).

1. Log into the NVS-25 server on the computer web browser.

2. Click on Settings Tab and select Restore Defau lt.

3. Click on the Reset All button to proceed.

4. Reboot the unit after al l settings have been restored to the def ault; re-login w ith
default username and password (admin/000000).

32

H.264 Network Video Streaming Server

Stream Server

OFF

Input Source

HDMI

Resolution

No Source Input

Brightness

128

Contrast

128

Hue

128

Saturation

128

Sharpness

128

Scale Down

No

SD Aspect Ratio

4:3

H.264 Level

3.1

H.264 Profile

Main

GOP Structure

IPPP

GOP Size

30

Video Bitrate

3000 Kbps

Video Rate Mode

VBR

Audio Stereo

Stereo

Audio Bitrate

384 Kbps

Audio Source

DIG

Analog Audio System

EBU

F/W Version

160224

The factory default stream settings are listed as follows:

NVS-25

33

H.264 Network Video Streaming Server

NVS-25

Restore Factory default via STM button

The NVS-25 can als o be restored t o the fac tory defaul ts using the STM button located
on the front panel. P ower off the unit and then press and hold the STM button while
turning on the NVS-25 power; keep pressing the STM button for 40 seconds. After
releasing the STM button, NVS-25 will take another 30 seconds to complete the boot-up
process. Remember to login with default username and password (admin/000000).

14. Recording the stream to USB 2.0 media

The NVS-25 is capable of recording t he streamed video and audio into an MPEG2
TS/MPEG-4 file on a connected USB 2.0 pen drive.

If the video being streamed into NVS-25 is of a H igh Def inition 10 80i v ideo form at then
the recorded file will use this re solution. If t he video being streamed into N VS-25 is of a
Standard Definition NTSC format then the recorded file will adopt this resoluti o n instead.

The USB 2.0 pe n drive should b e a for m at te d FAT32 drive in order to be readable b y
NVS-25 to which it is connected. If the USB connected media is incompatible (not
FAT32) or unformatted, the error message will show “USB storage partition
incorrect.” The user m a y choo se to f orm at the connected U SB dr ive b y clicking on t he
“Format USB Storage” button.

15. Status > Device Information

The Status tab displays the de vice information such a s USB storage informatio n and
stream information.

15.1 USB Storage Information

If no USB drive is connect ed, t he m essag e “NO US B Storage plugged” w i ll be di splaye d
as shown below.

34

H.264 Network Video Streaming Server

NVS-25

15.2 Stream Inf ormation

Stream information di splays the c urrent enc oder setti ngs. A sample stream inform ation
display is s hown be lo w.

35

H.264 Network Video Streaming Server

2

1

3

NVS-25

16. Streaming Examples

Various examples of streaming using N VS-25 will be described as follows. There are
three streaming protocols available on the NVS-25: HTTP Live Streaming (HLS)

Protocol, Real Time Streaming Protocol (RTSP), and Real Time Messaging
Protocol (RTMP ).

16.1 HTTP Live Streaming (HLS) Protocol

Use NVS-25 to feed IP video stream to several Apple computer clients or tablet
computers such a s iPad, iPhone or MacBook r unning Saf ari browser. HLS feeds video
and audio streams to the iOS devices. Note t hat, depending on t he settings c hos en,
HLS latency may be up to 10 seconds in case of live events.

In order to configure HLS protocol, t he user should first f ind the NVS-25 IP address on
the network usi ng t he IP finde r t hat D atavid eo p ro vide s. Once the NVS-25 IP addre ss is
known, enter t he IP addre ss into the S afari web b rowser address bar on iPad or other
iOS devices. Please refer to t he sect ion on H ow to fi nd NVS -25 on a n IP networ k for
more information.

Enter the username a nd passwor d to log into NVS-25 to gain acc e ss to t he Home Page
of the web-based g rap hical user interf ace. P lea se r ef er t o t he sec tio n on NVS-25 Login

using a Web-Based Graphical User Interface for more information.

Clic k on t he Settings Tab a nd change the protocol to H LS. Click o n Apply to s elect
the desired protocol.

Once the NVS-25 configuration pro gress bar displays 100% com pletion, click on the
Live tab and the video stream will be displayed on iPad or other iOS devices.

36

H.264 Network Video Streaming Server

NVS-25

16.2 Real Time Streaming Protocol (RTSP)

Use NVS-25 to feed IP video stream [TCP , HTTP] to a small group of clients on a Local
Area Network (LAN) or Wide Area Network (WAN). The user can then view the video via
free client software such as VLC Player. However RTSP does not work well with
some tablet computers. RTSP is open for viewi ng by anyone on the same networ k
with the streaming details or link. It can be sent acr oss t he internet, but eac h client

added will ad d data loa ding to NVS-25, as e ac h video str eam is set up individually
for each client. RTSP has a limitation of three viewing clients before NV S-25 becomes

congested and video stream fails.
In order to config ure RTSP protocol, the user should first find the NVS-25 IP address on

the network usi ng t he IP finde r t hat D atavid eo p ro vide s. Once the NVS-25 IP addre ss is
known, enter the IP addr e ss i nto the web br owser address ba r o n the com p uter or ot her
devices. Please ref er to t he sect ion o n How to f i nd N V S-25 on an IP netw or k for more
information.

Enter the username a nd passwor d to log into NVS-25 to gain acc e ss to t he Home Page
of the web-based g rap hical user interf ace. P lea se r ef er t o t he sec tio n on NVS-25 Login

using a Web-Based Graphical User Interfa ce for more information.

Click on the Settings Tab and c hange the protocol to RTS P over TCP or RTSP over
HTTP. Click on Apply to select the desired protocol.

Once the NVS-25 configuration pro gress bar displays 100% com pletion, click on the
Live tab and an RTS P link to the video stream will be d isplayed. You can also find the
link displayed below the Stream Server Selection menu.

Ente r t he R TS P l i nk into VLC Media Player as depicted in the diagram (Media > Open
Network Stream) below.

37

H.264 Network Video Streaming Server

NVS-25

16.3 Real Time Messaging Protocol (RTMP )

Use NVS-25 to deliver a single IP video stream [TCP] to a server on a Wide Area
Network [WAN] like the internet (RTMP Publish) or to a small group of clients on a
private Local Area Network [LAN] (RTMP Local).

The server on t he WAN could be the server of a Content Delivery Network [CDN],
suc h as Ustream. To use a CDN, you ma y need to reg i ster f or a f ree / trial account with
additional costs first. The user just need to deliver one video stream to the CDN and that
IP video feed will be shared am ong m ultiple viewer s. Thi s means le ss work for you and
the NVS-25 as well. CDNs differ in tariffs and the wa y they operate so it is be st to do

your homework beforehand.

The server on a W AN could a lso be y o ur ow n Wowza server. Wowza server i s a not her
form of C DN solution, typically for large organiz ations, where yo u brand the look a nd
feel of the delivery network plus the video stream itself. Again it is bes t to do your

homework bef or e ha nd.

Connect your NVS-25 to a server and us e the IP finder to search for t he device on the
network. Once the NVS-25 IP address is known, enter the IP address into the web
browser address b ar on the com puter or other devices. Please ref er to the sect ion on

How to find NVS-25 on an IP network for more information.

Enter the username a nd passwor d to log into NVS-25 to gain acc e ss to t he Home Page
of the web-based g rap hical user interf ace. P lea se r ef er t o t he sec tio n on NVS-25 Login

using a Web-Based Graphical User Interface for more information.

Click on Setting a nd change the protocol to RTMP Publish or RTMP Local. If you are
sending the NVS-25 stream to a Content Delivery Network (CDN), please se lec t RT MP
Pub lis h and ent er your CDN Publish URL and Stream Name in the text box as show n
below.

38

H.264 Network Video Streaming Server

NVS-25

Click on Apply to select the desired protocol.

Onc e the N VS-25 configuration progress bar displays 100% completion, you can now
view the streaming video from NVS-25 on the Content Delivery Network (CDN).

If you are using NVS-25 as t he local RTMP server t hen a video stream p layer window
will be availab le under the L iv e Ta b . C lick o n the P lay butt on at t he lower left cor ner of
the payer window to start playback of the RTMP stream.

The following three sub-sections provide examples of streaming video to a Content
Delivery Network such as USTREAM, a WOWZA Server and Youtube.

39

H.264 Network Video Streaming Server

Stream Name

Click to view

NVS-25

16.3.1 NVS25-USTREAM Connection Co nfiguration

1. Login USTREAM (http://www.ustream.tv/) and create a channel under

function li s t

2. Click on the r emote option, the page w ill generate two parameters, RTMP

URL and a stream name, as shown in the diagram below.

3. Login NVS-25 and go to “Live Stream Setup.”

4. Copy and paste “R TMP URL” and the “stre am name” into RTMP URL a nd

RTMP Stream text bars respectively. If your CDN ser vice provider requires
you to enter the RTMP stream credentials, please enter in the “RTMP
Username” and “RTMP Password” text bars.

5. Step 4 allows the user to stream video from NVS-25 to USTREAM.

6. Select the co nfigured channel on USTRE A M t o view t he v ideo stream ed from

NVS-25.

40

RTMP URL and Stream Name

H.264 Network Video Streaming Server

NVS-25

NVS-25 Live Stream Setup (USTREAM)

16.3.2 NVS25-WOWZA Server Connection Conf iguration

1. Install WOWZA on a server assigned of an externa l IP (This server is solel y

for WOWZA and contains no other unnecessary configurations).

2. Login NVS-25 and go to “Live Stream Setup.”

3. Enter “rtmp://61.220.30.5/live/nvs-25” into the respective RTMP Publish text

bars as depicted in the diagr am below, where 61.220.30.5 is the W OWZA
server computer IP (RTMP URL ) and NVS-25 (RTMP Stream ) is the c ustom
streaming location on the WOWZA server.

41

H.264 Network Video Streaming Server

The server phys ical IP

nvs-25 is the stream name

NVS-25

4. Go to the website,

http://www.wowza.com/resources/3.5.0/examples/LiveVideoStreaming/Flash
RTMPPlayer/player.html.

5. Enter the WOWZA server computer IP and the custom streaming location as

illustrated in the diagram shown below.

6. Live video streaming is displayed in the diagram below.

42

NVS-25 Live Stream Setup (WOWZA Server)

H.264 Network Video Streaming Server

NVS-25

16.3.3 NVS25-Youtube Connection Configuration

1. Login Youtube (https://www.youtube.com/) and click on “My Channel” to enter

a page on which you will find a Video Manager tab.

43

H.264 Network Video Streaming Server

NVS-25

2. For first-time user, the Youtube account must be verified before creating a live

event. Click on “E nable l ive streami ng” butto n and the subseq uent wizard w ill
take you through the account verification process.

3. Once your youtube acc ount is ver ified, you are the n ready to start cr eating a

live stream. Click o n the blue “Create live event” button to enter the event
settings page.

44

H.264 Network Video Streaming Server

4. There are two tabs on the event settings page, basic info and advanced

settings, as shown in the diagram below.
a. To best promote yo ur video, enter the event’ s title and description a nd

make sure they are clear, specific and relevant to the live event.
b. Also add relevant tags to expedite search for the event.
c. Config ure start and end time s so users are able to know when to watch

the event.
d. In t he private setting dro pdown menu, set the eve nt to public if you are

ready to have the eve nt appear on the c hannel and the searc h result. If

you are not ready to have the event viewable, or setting up the task

event, make sure to select the unl isted archive sett ing in the dropd own

menu.
e. Categorize correctly, people are more likely to read your video highly

and watch it more frequently if it is placed in the relevant category.
f. Next to the basic info tab is the “Advanced sett i ngs” ta sk, where yo u can

allow and disallow comments.
g. You can also enab le embedding w hich makes the e vent embeddable in

other locations.
h. In the second column, this is where you can enable and disable

recording in DVR functionali ty.
i. Click on the blue “C reate Event” butto n to save the setting. O nce your

event settings are saved, you can now move on to configure your

ingestion setting.

NVS-25

45

H.264 Network Video Streaming Server

NVS-25

5. On the Ingestion sett ing page, the encoder setti ng will appear af t er a b itrate is
selected. “Primary Server URL” and “Stream Name” are two important
parameters to be entered into Live Stream Setup on NVS-25.

46

H.264 Network Video Streaming Server

NVS-25

6. Copy and paste “Pr imary Server URL” and “Stream Name” into RTMP URL
and RTMP Stream text bars on the Live Stream Setup page of NVS-25
respectively. If your CDN service provider requires you to enter the RTMP
stream credentials, please enter in the “RTMP Username” and “RTMP
Password” text bars.

47

H.264 Network Video Streaming Server

NVS-25

7. After completing Step 6, click on the Live Co ntrol Room to enter the page
shown below. Once the stream is loaded, the “Preview” button will turn to
“Start Streaming”. Click on “Start Streaming” button to start streaming video to
Youtube.

48

H.264 Network Video Streaming Server

Web Serve r/HLS

RTSP

RTMP

80

8554 (over TCP)

1935 (RTMP)

8000 (over HTTP)

8080 (RTMPT)

8080 (over HTTP)

8081 (RTMPS)

Function

State

Description

NVS-25

17. Port Forwarding on your Firewall / Router

In order to view t he NVS-25 video stream on rem ote com puters ( hosts on t he Internet),
port forwarding function must be enabled, i.e. set aside one port number on the gateway
for the exclusi ve use of comm unicating with a servic e in the private network. Contact
your local network administrator or IT support for port forwarding configuration.

Different port numbers of the “port forwarding” function

18. LED Status & Button Behaviour

18.1 LED Status

a. OFF Power OFF

Power LED

Record

Stream

Interface

b. Red System Boot-up & Program Initialization
c. Green System Ready with Interface LED
d. Blinking System Error
a. Red System Error
b. Green Recording
a. OFF Stream OFF
b. ON Stream ON
a. OFF Program not initialized
b. ON Source input OK

c. Blinking Red

Blinking while no source input
Blinking while invalid source inp ut

49

H.264 Network Video Streaming Server

Hold for 3 seconds

1. Streaming LED OFF

input)

No.

Problems

Solutions

1.

Mode buttons o n the fro nt

It takes quite a while for the system to

seconds.

2.

Record button on the front

Please wait for at least 10 seconds and if
button again.

3.

RTMP Local / Publish do
modes.

As IBBP and IBP are new parameter
recording only work in IPPP mode.

NVS-25

18.2 Button Behaviour

Button Behavior Description LED

STM

MODE
(Stream OFF)

MODE
(Stream ON)

RECORD Press Once Start/Stop Recording Record LED ON/OFF

until Stream LED

Press Once

Press Once

Start/Stop Stream

Change to next
(HDMI->SDI->CVBS->)

Stop Stream ->
change to next
(HDMI->SDI->CVBS->)
Start Stream

Stream LED ON/OFF for
starting or stopping

Interface LED changed

2. Interface LED changed

3. Stream LED ON
(If there is a valid source

19. Frequently-Asked Questions

This section descr ibes problem s that you may encounter while using NVS-25. If you
have questions, please refer to related sections and follow all the suggested solutions. If
problem still exists, please contact your distributor or the service center.

panel is not sensitive.

panel is not sensitive.

switch modes after the mode button is
pressed. Please wait for at least 10

the system does not respond, press the

not work in IBBP and IBP

50

settings, RTMP streaming and MP4

20. Specifications

1 x BNC for HD/SD-SDI (75 ohm)

Video Input

Audio Input

Output

Video Encode

Supported Video
Resolution

1 x BNC for CVBS (75 ohm)
1 x HDMI (Ver 1.3)
SDI embedded audio (2 channels)
2 x XLR/RCA for Analog audio (2 channels)
HDMI embedded audio (2 channels)
1x RJ-45 Female (10/100M Ethernet)

1x USB 2.0 Type A for file output to USB storage
H.264 / AVC video CODEC, up to High Profile Level 4.0

Configurable Bit-rate up to 6Mbps
1080 @ 50P / 59.94P / 60P

(50P/59.94P/60P input, 25P/30P record/output)
1080 @ 50i / 59.94i / 60i
720 @ 50P / 59.94P / 60P
576@ 50i, 480 @ 59.94i

H.264 Network Video Streaming Server

NVS-25

Audio Encoding

Network Feature

Monitoring 6 x LED (PWR/ CVBS/ SDI/ HDMI/ REC / Streaming)

Storage

Control Web UI for system configuration and control
Update Firmware upgradable by web UI
Power Input AC 100 ~ 240V Switching Adaptor

Environmental
Conditions

AAC-LC audio CODEC
Sample rate:48KHz,16bit
Configurable Bit-rate up to 384Kbps

DHCP Client
Streaming feature:

- HLS/RTSP/RTMP Server (One protocol at a time)

- Supports up to 3 clients

USB 2.0 Mass Storage
File system: FAT32/MP4

Operating temperature: 0～50℃
Storage temperature: -10～60℃

51

H.264 Network Video Streaming Server

NVS-25

Service & Support

52