Tag: DVS DVR
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Generally speaking, when engineers choose network transmission equipment, they often have such confusion: video servers, hard disk recorders and video capture cards all have the function of network transmission, but the price is very different. Which one is better? Indeed, people who have just entered the market often don't understand the differences, let us first understand the differences between the three products:
DVR
Digital Video Recorder (DVR), a digital video recorder, uses hard disk recording compared to traditional analog video recorders, so it is often called a DVR, also known as a DVR. It is a computer system for image storage processing, with long-term recording, recording, remote monitoring and control of images/voices. DVR integrates video recorder, picture splitter, pan/tilt lens control, alarm control, network transmission. Wait for five functions in one.
Video capture card:
The video capture card, also known as a video capture card, can be used to digitize video information and store or play digital information. Most video capture cards can record audio while capturing video information, as well as ensure simultaneous playback and simultaneous playback. In addition, many video capture cards also provide hardware compression, fast acquisition speed, and can achieve full-screen video capture of 30 frames per second.
Video server:
The so-called video server, we can see as a network camera without a lens, or a DVR without a hard disk, its structure is similar to a network camera, is composed of one or more analog video output, image digital processor, Compressed chip and a server with network connection function. Simply put, the video server digitally processes the input analog video signal and transmits it to a dedicated device on the network in the form of a digital signal, thereby realizing remote real-time monitoring.
So, in the specific project, what kind of network transmission products are we suitable for?
First, the difference between network video server (DVS) and hard disk recorder (DVR)
The video server application, compared with the DVR application, has a distinctive feature that its system is based on the network architecture, and the video system captures, transmits, stores, retrieves, displays, manages and other functional modules.
In simple analysis, DVRs are more concerned with ensuring the reliability of local storage, while video servers are more concerned with the video transmission efficiency and quality of the network. The DVR uses a centralized architecture that requires all video signals to be pulled onto the recorder. The video server uses a distributed architecture that allows multiple video servers to be connected to each monitoring point. These two types of products have some overlap in function, and the DVR can be self-contained in a stand-alone operation, and the video server cannot be separated from its system to run separately.
DVRs sometimes assume the role of a video server for network video transmission. However, network transmission is only an auxiliary function of the recorder, and the efficiency cannot be compared with the video server. Choose a hard disk recorder or a video server, mainly based on the needs of the project.
Second, the difference between network video server (DVS) and video capture card
The video capture card belongs to the analog monitoring device. The main disadvantages of the analog monitoring system are as follows: 1 It is usually suitable for small-area area monitoring: the transmission tool of analog video signal is mainly coaxial cable, and the distance of coaxial video transmission analog video signal is less than 1KM. The distance between the twisted pairs is shorter, which determines that the analog monitoring is only suitable for a single building, a small residential area and other small areas;
2 The system's expansion ability is poor: For a system that has already been built, if a new monitoring point is to be added, it is often a one-shot move, and new equipment is difficult to add to the original system.
The video capture card can be directly inserted into the computer for convenient use, and the cost is low, but the requirements for the computer host are relatively high, and generally can be used for non-professional fields such as homes and shops.
The network video server is a digital monitoring device with the following application advantages:
1. Remote real-time monitoring - Using the advantages of the network, the digitized and compressed image data can reach the place where the network can reach and realize remote monitoring.
2. The DVR is a digital hard disk recording host. The analog signal is converted into a digital signal based on an analog surveillance camera that has been installed in a large amount, and then stored and processed. The network video server has a built-in Webserver, which can transmit digital video signals directly through the network communication transmission protocol (TCP/IP protocol). Application advantages of remote users: Visitors do not need to use any professional software, as long as the common web browser (such as MicrosoftIE or Netscape) can monitor and record in real time.
3, plug and play, no need to install coaxial cable like an analog camera anytime, anywhere, as long as the existing network can be used. Network video servers can be widely used in any corner of the world to continuously transmit images in real time, and even remotely monitor and record wireless broadband networks in environments where wiring is not suitable.
4, flexible integration - as long as there is a network interface, you can access the network video server at any time.
5, real-time video - real-time transmission of high-quality images at a rate of 25 frames per second on the network, and support multi-user simultaneous access and video recording, users can use H264, MPEG4, DivX and other compression formats for video recording. Automatically detect moving images.
6, centralized management, cost savings - no need for special management, plug and play, no distance restrictions, but also save the wiring, saving costs.
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