FAQ contains information which covers General, Performance,
Network and application of Network camera and video
server, Please select the item you would like to refer
to below.
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We follow Motion JPEG of an international standard.
It uses still frame coding rather than adjacent
frame as like MPEG1,2,4 and H.263. Thus, it delivers
crispy video without any image garbling on the
low bandwidth. Secondly JPEG has a good flexibility
with other application software. Since it became
an international standard, lots of application
programmers use JPEG for their application. Last
but not least, JPEG requires low decoding rate.
Thus, multiple video channels can efficiently
be decoded and displayed at low powered PC. But
other Algorithms requires Hugh PC system requirement
to make same performance that JPEG can make.
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Java Applet is designed to work on Any Operating
systems such as MS Window, Unix, Linux and OS/2.
But it works on JVM(Java Virtual Machine) which
is supported by most of web browser and O/S. But
sometimes version of JVM is different depending
on the O/S. As long as user have right version
of JVM in his or her viewing PC, user can receive
and view live video from FlexWATCH™ series
on any O/S. If network camera and video server
does not support Java Applet mode, user need to
check out JVM version and report to local distributor
or manufacturer so that manufacturer and optimize
Java Applet mode to meet user's JVM version or
right version of JVM will be informed to be loaded
in the user's viewing PC. If real time video is
to be viewed by multiple and none specific users,
it is hard to guarantee constant access to video
server. That is why Java Applet mode is so important
factor to be considered.
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FlexWATCH™ focuses on the compliance with
an existing network and standards. It can be summarized
as follows:
This is an important feature because most of handheld
device or wireless device support and will support
web-browsing function. In case that ActiveX or
plug-in software is supported, at viewing PC or
handheld device(e.g., PDA) requires some proprietary
application program to review and display live
video.
Without any software installation, clients can
watch the remote site using web-browser. However,
we provide FW-Voyager as an easy to use personal
DVR(Digital Video Recording) tool. It provides
a tool to record real-time video triggered by
time reservation, motion detection and sensor
in addition to Snapshot and forced saving options.
So you do not need to sit down and see all video
but simple reserve a time or condition to record
and play back later on.
FlexWATCH™ uses 30 fps hardware real-time
Motion JPEG(International image compression method).
All of FlexWATCH™ series support 30 fps real-time
hardware image compression
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Most of webcams are like a low cost (e.g., 30-60USD)
USB CMOS camera with webserver software. We call
it Internet camera or web camera. Web camera requires
some specific proprietary application program
to view from the remote site. But FlexWATCH™
series has a built-in web server that is IP addressable
and can be accessed through Standard Web browser
such as MS Internet explorer or Netscape Navigator.
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Typically, whenever we think of network video
server, we do not distinguish between HTTP basis
and socket basis systems. The reason is that remote
PC clients use the same web browser for the remote
access and monitoring. But there is a definitely
difference in its application.. HTTP protocol
encapsulates TCP/IP and hardware stacks. Thus,
if client accesses HTTP basis system, the response
time becomes a little slower than socket basis
system which is only dealing with TCP/IP and hardware
stacks. Most of network video server using ActiveX
or plug-in software is based on socket-based system.
Thus, the response time (e.g. : frame decoding
rate) is quite faster than HTTP basis system.
But socket based system requires specific program
to run any O/S. HTTP based video server enable
Application program developer to use CGI interface
only which is very easy interface to build up
Web based Application program. But Socket based
program requires developer to use library file
(e.g., dll file in windows) to build up application
program. FlexWATCH™ server series support
both HTTP( Applet mode, FW-Voyager mode) and Socket
protocol (FW-manager)
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Firstly, MJPEG is much simpler and smaller than
other systems in its computation at PC. Thus,
if proprietary management software is used at
central monitoring, it provides better performance
than others to administrate more network video
servers at one control center PC. Secondly, FlexWATCH™
follows HTTP basis system, but most of others
are based on socket-based system, which will be
workable only on Window O/S. It is directly engaged
in the compatibility with existing other network
equipment such as hand held device or other O/S(Unix,Mac
etc) . Last one is that MJPEG of an international
standard has a lot of merits whenever the compressed
stream are used for customer's purpose such as
video editing and format converting or so.
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FlexWATCH™ provides 30 fps display speed
in real-time. Display speed means an actual decoding
rate at PC using web-browser or other software.
However, there are a few factors to make an influence
in overall system performance. Firstly, if you
use web browser such as IE or Netscape, it can
support at least 15 fps ~30fps (when single video
channel is activated). Using our proprietary network
software, you can generate 30 fps in real-time.
Secondly, even though FlexWATCH™ can transmit
30 fps, the actual display rate will change depending
on the network bandwidth and Client PC performance.
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We support 4 image resolutions such as 720x480,
720x240, 320x240,160x120(at NTSC). These resolutions
are widely used features in video monitoring application.
However, you can adjust the display image resolution
whenever you need to enlarge or reduce.
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In case of 320x240 mode, the bit-stream size of
each frame ranges from 4Kbytes to 8Kbytes. In
case of the largest size (720x480), the size is
between 15Kbytes and 25Kbytes. In the smallest
image resolution, the bit-stream size is in the
range between 2 and 3 Kbytes. Thus, according
to your application, you can anticipate the actual
performance and adjust the image resolution and
image quality.
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No, 15fps or 30fps is for the speed from single
video port at the local network. But if over two
video inputs is connected to the server, 15fps
should be divided by number of video port. Theoretically,
total frame rate which can be received by Client
PC is 15fps when there is over 2 videos input
connected, although Maximum frame rate is 15fps~30fps(HTTP
based) or 30fps(Socket based) from the Single
video port. If Video server is connected via internet,
actually frame rate is lower than local network
and it is depending on the network bandwidth
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In a local LAN of high speed network, FlexWATCH™
can support around 30 clients. However, over an
Internet based on ADSL/Cable/Dedicated line/etc.,
the actual number increases (e.g., 100 clients)
because the response speed becomes slow. Of course,
there is degradation in performance according
to the increase of clients.
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FlexWATCH™ support HTTP port change option.
So you can change HTTP port from 80 to other port
number you would like to use. Simply connect video
server and change the Port number. You do not
need to change web page of video server to pass
through HTTP 80 block by ISP.
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Yes. We provide special service for dynamic IP
address users. Typically, in order to use multiple
PCs and FlexWATCH™, there must be local Network
and internal IP address is private IP (e.g., 192.168.xx.xx,
10.10.xx.xx). Even this private IP address is
assigned to FlexWATCH™, any remote clients
access FlexWATCH™ over Internet. In order
to realize it, we provide a AOIP (Always on IP)
service. Our service does not care whether you
use private IP or multiple FlexWATCH™ over
single dynamic global IP address. Please visit
our AOIP server pager by clicking www.yesaoip.com.
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Yes, you can place FlexWATCH™ network Camera
and video server behind the firewall. But you
need to configure NAT(Network Address Translation)
and open HTTP port.
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Yes. We provides RS-232 interface for modem connection.
In reality, there are a lot of difficulties to
identify all types of modems. However, we do not
distinguish modems. Customers can use any types
of modem for dial-in or dial-out function You
just connect external modem to RS-232 port of
FlexWATCH™ servers and make a call from remote
PC using dial up networking. And then run your
web browser and type the default IP address for
Modem connect and view live video.
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Yes. We provide flash memory space to attach a
few Customized HTML pages and you can also link
your FlexWATCH™ image to your own web site.
Please contact your local distributor or download
technical document.
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Yes, you can connect and link live video from
the FlexWATCH™ connected to Dynamic IP and
registered in AOIP service.
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You can record live video image in real time using
FW-Voyager software that is freely downloadable
one. FW-Voyager software provides you various
option to record live image captured by Time reservation,
Motion detection, Alarm sensor trigger as well
as Snap shot and Forced image saving. FlexWATCH™
provides FlexWATCH™ viewer program that enable
you to play back the entire recorded image at
your convenient time. So Plug-in provide Network
DVR( Digital Video Recorder) and this program
can easily downloaded from FlexWATCH™ home
page, www.flexwatch.com.
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Yes, FlexWATCH™ supports RS232/485 communication
with other PTZ device. Currently Pelco-'P' protocol
receiver and Dome camera, Sony VISACA (EVI-D30),
Panasonic (WV-CS854), Kalatel Cyber dome, AD delta
dome, Vicon V1311RB, Samsung SPD-1600 and some
other brands are directly connected to the video
server. If it is communicated by RS-485(422),
daisy chain of up to 6 different camera is also
possible.
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Yes, we support PTZ by-pass command mode through
which you can send transparent data to your PTZ
device through FlexWATCH™ server. In this
case you need to create your own control panel
of CGI in the Video server. Please kindly see
more details from our FlexWATCH™ user's guide
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Yes, you can set up the server to send live image
to your FTP site. Both Time reserved and event
triggered FTPing is supported by FlexWATCH™
series. You can also get e-mail from FlexWATCH™
series if there is any triggered event.
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Yes. We provide Win socket API and HTTP CGI interface
for application program developers, its manual
and test source code to show how to administrate
FlexWATCH™.
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FlexWATCH™ sever support Java script mode
which is supported by most of PDA device so that
you can view real time live video without any
specific viewing software in your PDA. Please
add "/pda2" right after IP address of
FlexWATCH™ video server, e.g., <192.168.0.157/pda2>.
If your PDA has JVM(Java Virtual machine), you
can view live video in the Java Applet mode when
you are connected to video server.
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Yes. You can display and recording video from
up to 36 video channels over the LAN or WAN(DSL/Cable
modem) using FlexWATCH™ manager.
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