Network video server with lots of ads that describe never outfit. So many options, which is a product of high quality, which is really a product is suitable for their needs, I think, in light of the advertising is to choose a salesperson only those products quality assured cannot rely on advertising is the accumulation, but praise on strength. Buy the wrong product quality, not only is assured, let a person do not use more in the future will cause irreparable. So before selecting a product, the user can distinguish the product through the test, which are good choices.
Below, we'll tell you how to test network video server performance to help readers to choose the right for products, from the mistake.
Editrice mpeg-4 compressed format
In product testing, before is on the market at present is exactly mpeg-4 product to make a brief introduction to the convenience of clients.
Mpeg-4, mpeg-2, and M - JPEG image compression formats is the name, in the same quality request, transmission mpeg-4 because of its low requirements for network bandwidth, and can provide more customers are now employ.
Mpeg-4 format and Short of compressed into this, Simple Profile and ASP.
This framework, Short based on DSP technology is relatively low compression ratio, low requirements for compressed chips, streaming, only support to the CIF graphics.
Simple Profile of image compression with more demanding, due to the loss of image compression ratio, and relatively large, heavy burden to the CPU.
Based on ASP ASIC structure, based on the studies of Profile, especially for graphics image coding, D1 in streaming under the premise of not increasing amplitude, improve the quality of images, the images of DVD quality. Under certain conditions, ASP coding ability to Simple Profile of 1.5 times.
Get all the different products manufacturer, we can start the test.
Suggested test environment
Testing project
Video quality
Say, for network is a good video server, image quality of life, so it is difficult to imagine that a definition of fuzzy video network video server can bear the responsibility of safety monitoring. So, the first step is the first test to see its image quality.
Use the pixels to identify professional quality, this video test method can be used to different network video server to get in contrast is compared, former first will mainly, resolution and frames to the same setting, in order to avoid eye cause visual error. In order to more accurately test video server using high quality graphics, suggest the camera lens with Tamron ke to test environment.
Video camera access to browse video image, after the server at drawing zooming, until the whole drawing supports full preview window to get clear and the video images. The test will be needed for video server Settings, 25fps / 3M D1 / video preview window PC through careful resolution can be seen in vertical and horizontal directions, the number of lines.
Video transmission delays
For safety monitoring products, light quality is far from enough, clear, if is to monitor real-time image quality is good, but again, causing delays backend see incident actually already in the past, it will lose real-time monitoring of meaning. Some manufacturers (such as ACTI) write delay test counting program is as follows:
First, the television camera at PC screen corner, then open the IE browser input IP address into a Web video preview management interface,
Will drag, corresponding to the camera meter of screen corner and choose the correct type, according to begin to use. If the timer to choose, at this time will PAL frames per second, 25 to timing,
After a moment, using the PC screen screenshots function will be copied to your Windows drawing picture, see the tool is video server time delay of value,
Picture
Many network video server because of its low resolution, so that in itself, it can enlarge to see very clearly, affected the whole picture. First we will tilt the camera at the edge or objects on line makes cameras, which will tilt testing video server Settings for D1 / video preview window opened, 3M focal adjustment for the best use of the client software, the snapshot pictures, and finally to intercept a few brands of network video server gets the pictures carefully check, can edge to conclusions. Serrated
Network transmission
Currently there are many products in the emphasis on "multicast" function, "multicast" simply is to multiple clients to visit the same video source, and will not take much bandwidth resources. Before the test, must first of all in the environment has been open network connection device of multicast function
If one device or do not support this untapped function, can affect video transmission.
Above all the quality and function from hardware tested up, in addition, the user can need according to own actual installation, from the actual need, consider whether the product to support the audio (if), audio and video sync product installation, the product of the environment to work with the temperature, the software function dint, video, how can more support and control software upgrades, etc, to make further consideration.
Epilogue:
Information age, the network application put forward higher request, network video server everywhere in the world through the INTERNET for remote monitoring, complex network configuration and wiring job, greatly reducing the cost of projects in the distance, centralized monitoring environmental plays an important role. Master of the testing method and understand the basic situation of network video server, engineering and users in choosing products, can choose a reliable performance, powerful, cost-effective, easy installation of network video server.

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