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The composition and function of Video Server

I. the composition of the video server

Video server is a special computer for compressing, storing and processing video and audio data. It is composed of video and audio compression encoder, mass storage device, input / output channel, network interface, video and audio interface, rs422 serial interface, software interface, protocol interface, video and audio cross point matrix, etc., at the same time, it provides external phase locking and video processing functions.

1. Video and audio compression encoder

Because of the large amount of data after video digitization, it is necessary to use mature compression technology to compress the video data under the condition of high voltage ratio to meet the requirements of storage and transmission.

The trial server generally uses M-JPEG or MPEG-2, MPEG-4 and other compression encoders, and users can choose compression codes and compression structures according to the actual situation, so as to be suitable for different broadcasting occasions, so as to save hard disk space, increase program storage and ensure broadcast quality.

2. Mass storage devices

The video server uses high-speed, broadband SCSI interface hard disk or state-of-the-art FC interface hard disk as video and audio material media. At the same time, the hard disk expansion of video and audio data is also more flexible.

3. Input / output channel

The video server has a multi-channel input / output system, so that multi-channel input and playback can be carried out at the same time to realize multi-task.

4. Network interface

Video servers are equipped with network interfaces to facilitate networking and data sharing. Generally, video servers are equipped with FC and large network interface. FC optical fiber network uses ip protocol as the exchange network of fast and real-time copying and moving materials between video servers, and Ethernet is used to transmit control data and state test information.

5. Video and audio interface

Video servers are equipped with standard video and audio interfaces and analog surveillance video interfaces to facilitate monitoring the video information of each channel.

Input / output signals can be selected from analog, component, and SDI.

6. RS422 serial interface

The video server has several rs422 serial communication interfaces, and each interface can be recorded and played by an external computer through the RS422 communication line.

7. Protocol interface

The video server provides not only a variety of control hardware interfaces, but also protocol interfaces. For example, the RS422 interface not only supports RS422's profile protocol, but also supports louth, oderids, BVWAA and other protocols controlled by RS422.

8. Software interface

The video server provides an open software interface for users or third release vendors to develop and build new applications.

9. Video and audio intersection matrix

Video server with video and audio cross point matrix, video and audio channel scheduling is flexible, while ensuring that the technical indicators are not damaged. In addition, the video server also provides external phase locking and video processing functions to facilitate the construction of specialized video and audio systems.

II. Rental of videoconferencing services

Video conference is a new way of meeting with the development of information technology, which uses the virtual space of the network to complete the face-to-face real-time communication and communication in the process of meeting. The content of communication and communication should include meeting material exchange, text information exchange, voice information exchange and video information exchange. Among them, the sense of presence brought by the broadcast and interaction of video content depends on being closer to people's habits of traditional conference systems, which is also an important reason for the popularity of video conference systems.

Of course, the basic communication mode of Many to Many is the guarantee of video conferencing. in order to achieve this goal, video conference software generally has a unified, efficient and expensive multipoint communication server network for the mixed use of video, audio and other information.

To use videoconferencing, you only need to install a computer in each place where you need to attend, connect it to the network, and then equip the computer with accessories such as cameras and microphones. With the development of video compression technology, especially the increasing improvement and development of broadband network, real-time video communication has become the third largest service content in broadband network besides TV and data.

This kind of two-way, multi-point and real-time video and audio interactive system, which is not limited by region and based on broadband network, is called remote video conference system. And the conference that uses this kind of remote video conference system is what is commonly called video conference. There are many forms of video conferencing, one is a dedicated video conference system for enterprises, based on their own private or proprietary network, using special system structure and video conference equipment to build their own dedicated video conference system. The other is based on the Internet public conference system, in which the server constructs the Internet-based video conference system, which is open to the outside world through the Internet to provide Internet-based video conference services for enterprises or organizations.

A complete video conference system includes two parts: the video conference server and the video conference client, in which the video conference server is provided by relevant services or operators and is responsible for meeting management and content recording during the meeting. Video conference terminal equipment is used to complete the real-time input and output of video and audio information. Video conference terminal equipment accesses the network through standard protocols (commonly used H.323) to realize interaction with other terminal devices.

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