Four selection methods of network video server

1. Whether the product has relevant qualifications: Product qualification does not completely represent the quality and performance of the product, but it is the basic condition for the acceptance of many system integration projects, and it is also the basic condition for the qualification of the product.

2. Intellectual property protection of the product's background management software

Any network video server product must have supporting background monitoring and management software. Due to the large number of OEM products and illegal counterfeit products on the market, customers are overwhelmed. Hardware devices can be counterfeited, and software can be copied. In order to prevent illegal soft copies, the original manufacturers often set traps on the software, but users have become innocent victims.

Therefore, whether the background monitoring and management software supporting the product has intellectual property certification will be one of the important standards for customers to judge the product.

3. Actual bandwidth requirements for transmitting standard real-time moving images

This is one of the important indicators to measure the overall performance of the network video server. High bandwidth means an increase in network usage costs. For end users, this will shake their determination to adopt a digital monitoring model. After all, economics is a problem that any business unit has to consider.

Due to different image states (still, normal activity, high-speed motion), image resolution, and the number of transmitted image frames, the network bandwidth occupied by them varies greatly, so many network video server manufacturers always try to blur this when recommending products One indicator. In this regard, we can set a more uniform image state, that is, for normal moving images, the image resolution reaches 352 × 288, and the frame rate is 25 frames per second, the network bandwidth occupied by the video image all the way. According to our understanding, the bandwidth requirements of quite a few manufacturers including Taiwan and South Korea are between 500-600K, and some even require 800-900K.

4. Delay of remote video transmission

Although the transmission delay is inevitable for any network video server, the delay value of different network video servers is different. The delay value will directly affect the effect of digital monitoring. Imagine that when the surveillance personnel used the mouse to control the front camera pan-tilt in the monitoring center, they clicked the mouse five times within five seconds, and only after the tenth second saw the pan-tilt after the first click How about controlling the effect?

Since the transmission delay is different under different frame rates (the same product, the higher the frame rate, the lower the transmission delay), for the sake of comparison and uniformity, the condition is set to 25 frames per second.