[Introduction]With the development of technology to the present, there has been great technological progress compared with the million-daily delay of 2 years ago. Hikvision's recently produced IPCs can achieve 140ms. The biggest problem is network switching latency, which depends on the switch indicators, specifications, quality, and whether the network is dedicated. If there is a decoder on the backend, it will also have decoding delays, which will have poor performance of the preview device and preview delays. ...
SecurityHDTime is here, HDnetworkCameraI believe many people have used the machine, and its advantages are obvious: super clear - a little bit of information and save trouble -wiringSimple. However, there is a little delay. I believe many people are in contact with millionsHigh-definition cameraBefore, I would have put my hands in habitCameraSwing forward to see the smoothness of the picture and see if there is any delay.
Delay is HDWebcamone of the important indicators. To solve the latency problem of high-definition network cameras, we must first know how latency occurs: the following lists several important factors that cause latency of high-definition network cameras.
1. It takes time to collect and encode videos of high-definition network cameras (HDNC) to collect and encode videos.
2. HDNC codednumberSignals through the networktransmissionWhen, network latency can be generated based on the bandwidth capacity and performance of the network device.
3. After the backend device receives the encoded digital signal, it takes time to decode it.
Some netizens think that delay doesn’t matter, right? But if an accident occurs, it is because the short delay may have serious consequences and will not play a precautionary role.monitorWhat is the meaning of
With the development of technology to the present, there has been great technological progress compared with the million-daily delay of 2 years ago. Hikvision recently producedIPC can achieve 140ms. The biggest problem is network switching delay, which depends on the switch indicators, specifications, quality, and whether the network is dedicated. If there is a decoder on the backend, it will also have decoding delays, which will have poor performance of the preview device and preview delays.
Network camera delay is certain, but it is indeed a long way to go to achieve no delay. Generally, around 0.5S can be accepted. If the delay needs to be solved, it will be difficult to break through in a few years, and the technical bottleneck problem needs to be overcome.
How to reduce the latency of HDNC or even close to that of well-known brands? We only need to pay attention to the following points:
1. When developing new products, choose a good SOC processor
For example: HDNC using TIDM365+1.3 million pixel SENSOR, frame rate: 25 frames/second, delay is about 200ms. The 1.3 million pixel HDNC with TIDM368 chip can reach 40 frames per second, and the delay is much lower than 200ms.
2. Optimize network transmission method
Currently, there are two ways to transmit networks. 1. Transmission through TCP protocol. 2. Transmission through UDP protocol.
TCP protocol transmission has the following procedures: IP packet transmission, verification of information, and reception. The signal transmitted in this way is very complete. There is no packet loss. But the disadvantage is that it aggravates network latency.
UDP protocol transmission is very simple, with two steps: IP packet transmission and reception (or RTSP real-time streaming media transmission). The completeness, right or wrong information is not verified. Directly receive decode. This method can alleviate network latency very well, but there may be data loss or distortion. The use of UDP transmission method can still meet the monitoring needs well, while effectively reducing network latency.
3. Choose a good backend HD-NVR
The main function of backend HD-NVR is to receiveOnline videoSignal,storage, high-definition video decoding, etc. High-definition video requires high decoding capabilities of HD-NVR. A good HD-NVR will decode faster, take shorter time and smaller delays.
Overall, it is impossible to completely eliminate HDNC network latency, but choose the overallSolutionA better camera can control network latency within an acceptable range.