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With the audio-video coding technology and the continuous development of
broadband network technology, video transmission of achieving more easily and at
lower costs, making the growing demand for video transmission. Available in the
market to meet the network transmission network video server products a lot
more, we try to use simple language network from the video server concept,
composition, digital audio and video encoding technology, network technology,
and characteristics, the video server for analysis To facilitate easier
understanding of all network video servers and their choice.
First, the
concept of network video server
Video Server is a network of audio and video
encoding data processing and network transmission completion of the special
equipment in order to achieve remote monitoring function. On the market network
video servers are now using M-JPEG, MPEG4, H264, and other coding technology for
video data coding products.
Second, the composition of video server
Network monitoring video server is a realization of audio and video data
encoding, transmission network with special equipment, from audio and video
encoder, network interface, audio and video interface, RS422/RS485 serial
interface, RS232 serial interface, and so pose.
Audio and Video Coding:
As analog video data very large, through the transformation of mode, the volume
of data is also great, it wants to use sophisticated encoding technology, video
data transmission network to meet the requirements of the technical indicators
under high compression ratio Coding, to meet the requirements of transmission.
Before the video server network in general, such as using M-JPEG encoder, users
can not achieve higher compression rate to suit the different network
environment, reduce the frame rate only through the realization of the general
effect of the transmission network effect. Currently the company has launched a
network of MPEG4 video server to better video network transmission requirements.
Network Interface: As the previous analog network products are
expensive, mainly through the establishment of an independent optical fiber
transmission network, network video server Ethernet interface can easily achieve
IP network, and data transmission. Video servers used mainly TCP / IP protocol,
such as audio and video data, control data and information, and other state
testing data transmission network.
Audio and video interface: network
video server with a standard analog audio and video inputs to facilitate the
passage of the surveillance video signals. Net Vision technology using Dynamic
Stream Control Transmission ensure two-way real-time audio, video frame-rate
adjusted automatically according to bandwidth, the network interrupted
automatically after connecting technology.
RS422/RS485 serial interface:
network video server with RS422/RS485 serial communication ports, through
external communication lines such as Haeundae, fast ball, and other peripherals.
Video servers can be controlled with computer software systems group net
programmes, some manufacturers Video Servers provide open SDK, users or
third-party vendors for the development and build a new application form.
Third, the number of video server network audio and video coding
technology
Digital encoding technology, also known as compression, video
server is the core technology, we have chosen is the first video server network
inspection targets. The current popular digital compression format is MPEG-4 and
H.264, some of the old programme of foreign products is also available in the
use of wavelet compression and M-JPEG compression. This paper is mainly because
of network video server, the coding technology will be introduced as simple as
possible, if you are interested in algorithm analysis can refer to other topics.
1. M-JPEG
M-JPEG compression as a digital format, from analog to
digital, from video recorders to your hard disk video recorders, M-JPEG bring us
a brand new digital broadcast means, it has become the signal data, it should
be, M-JPEG Compressed video compression technology in the process of the
emergence of a milestone significance. M-JPEG is based on Intra, an independent
frame compression method, compared to later in the MPEG-4, H.264 compression,
its greater volume of data transmission problems, so the coding technology of
the video server network has been basically Now can not meet the needs of remote
monitoring, can only be considered once the product.
2. MPEG-4
In
the MPEG (Moving Picture Expert Group) compression method in the series, MPEG-4
technology is a stream with better quality than in a Therefore, many companies
have introduced codes of the products. The use of compressed between frames,
frame between the use of redundant information greatly reduced amount of data
compression, to achieve the same MPEG-4 video quality required for the M-JPEG
rate of only 1 / 30 or even fewer. We think the general sense, MPEG-4 IBP
compression method has been to meet the requirements of the transmission
network, the network also makes video servers in the network environment in
general application possible.
3. H264
Video Joint Working Group
(JVT, Joint Video Team) in the H26L based on the H.264 coding technology, by
increasing its operations to reduce the complexity of the stream at the same
time improve quality. H.264 is a low-stream transmission network to provide the
realization of the solution, the existing bandwidth makes the case more Lushuo
network video server applications possible.
4, the network video server
network technology
Video surveillance network servers due to the completion
of an independent network transmission functions, do not need another set of
computer, it can achieve its simple way IP network, is a traditional analog
control could not be realized. Each of the network video server with Wang
Duannei only IP addresses, use the network to connect the equipment to
facilitate convenience (IP address) for the control and management, but also
through the IP address identification, management and control of the network
video server connected video source, Its network is simply the IP network
connection, a new device needs only one additional IP address and greatly
simulated the convenience of the reason for upgrading the network and other
network requirements.
IP network is a network of video servers, but
because the domestic IP address the lack of resources, the current domestic
economic and broadband (ADSL, cable broadband, etc.) use dynamic IP means
Internet, which makes network video server Internet issues to be resolved, Video
servers can be used basically to support the domain name means DDNS (Dynamic
IP), if the network video server does not support domain analysis, you need the
additional cost of the use of expensive network.
As the video server
network can work do not need an external computers, the Internet can be an
independent video server automatically on the Internet it is very necessary,
otherwise a network video server configuration for a computer to realize the
loss of dial-up Internet video server significance. At present the domestic
network video server basically to achieve the features, such as network Vision
products specifically for the domestic situation and the design of broadband
ADSL technology automatically dial-up is very convenient.
Network video
server Zuwangfangshi have many advantages, the combination of central control
management software and server model can achieve more Web applications, because
of the length here, not discussed in detail, we will provide follow-up
specialized in Internet articles.
5, network video server features
Video Server with the traditional network equipment do not have many
characteristics of specific performance as follows:
(1) Multi-channel,
network transmission, and video playback features such as simple integrated
network, which the current H264 network in terms of hard drive recorders can
easily achieve, but the basic functions of two different products also led to
their applications Different, the current generation of the simulation stage and
the poor performance of the network equipment, network video server can provide
low-cost solution.
(2) network video server through the Internet, you can
achieve if the Internet where you can browse images by matching decoder does not
require computer equipment can be directly transferred to the TV wall, such as
browsing, saving a great remote monitoring The cost.
(3) network video
server multi-protocol support, and computer equipment for the perfect
combination of a larger network system integration, complete digital process.
Video server network in the current video in the field of application is
mainly use the Internet video server build remote monitoring system. Web-based
video server multi-channel digital communication technologies with traditional
tape recorders based on the analog output system unparalleled many advantages,
network servers using video hardware and software platforms and open standards
or universal interface protocol, the system expansion stronger ability to And
the future all-digital, network-based, systematic and multi-channel system of
sharing resources, such as convergence. CCTV equipment is from analog to digital
transition in the best option. And in the long run, the network video server
systems integration has a huge potential market and prospects for the
development of far-reaching, because Congshencengci, video network, and systems
integration is not only the problem of video transmission, it represents the
future of video applications Networking and Internet application development
trends, is a more Shencengcishang from the content of the interaction with a
broad development potential, the next 3 G, broadband business one of the core
content. So sure, with digital technology and network technology continues to
develop, video server network in the field of video there will be more extended
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