In the process of wireless video surveillance, the image is not clear, and the monitoring video is delayed. This phenomenon is unpleasant for users and businesses. So today we will talk about how to solve the problem of monitoring video delay. During the use of the wireless video surveillance system, we found that video delays that occur at high probability are generated by high-definition video surveillance equipment. In the contemporary monitoring system, the user pursues, high-definition, smooth, this is not a fish and bear's paw can not have both. Only the high-definition video surveillance equipment requires a little higher bandwidth. We can only solve this problem from the other side, and the solution has the following points:
1. Performance impact on wireless video surveillance equipment: The CPU processing capability of the device responsible for transmission or the speed of system response is not fast enough, resulting in delays in the transmission process.
If you want to transmit 1080P/60 frames of HD video data over a broadband-limited network without delay, we must first use a chip dedicated to processing video, and then reform and innovate the internal architecture and application algorithms of the transmission equipment. , to improve the compression ratio of the video encoding, so that the video data will not appear excessive delay in the transmission process, generally can be kept below 40ms.
2, on the impact of decoder performance: The so-called decoder generally refers to the decoder itself or the client used for decoding, if the client's host configuration. The quality of the decoder easily affects the video decoding speed. If the quality is not good, the video delay or card screen is very likely to occur. However, it should be noted here that sometimes in the process of decoding or encoding, in order to maintain the smoothness of the video, the system automatically adds buffering, which is also prone to some slight delay.
Your codec is not necessarily good, and the cheap codec is not necessarily bad. When choosing a codec, it is not based on the price level, but whether it is suitable or not. It is best to choose high quality and match. The codec is more conducive to the transmission of video data and reduces the delay.
3. Regarding the performance impact of the transmission line: It is well known that a good network cable and a bad network cable are naturally good transmission cables with higher efficiency, and are prone to delays and other adverse effects are bad network cables, so choose High-quality transmission equipment is an important measure to reduce delay; it is naturally a network cable when wired transmission, and a high-quality wireless transmission equipment when wireless transmission.
4. About the impact of the relay process of the transmission process: In the transmission process, each time it jumps, it means that the processing time of the relay device is increased once, so the more the number of jumps, the greater the time loss. Therefore, reducing the number of jumps when designing the transmission route can effectively reduce the delay.
5. Performance impact of the switch: When the traffic of the network becomes larger, the processing time of the switch and the router becomes longer, and the delay, packet loss rate, backplane bandwidth, switching capacity, and packet forwarding of the poor quality switch Factors such as rate will also be reflected directly in the process of network transmission, so controlling network traffic and selecting quality switches are also effective means to reduce delay.
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