In monitoring projects, often easy to encounter failure is the screen freeze. Basically, a lot of friends ask this day. What are the main reasons for the network camera freeze in this issue?
Cause one: camera itself
The technology of the network camera manufacturer itself is flawed. The network camera produced will have a large delay after long-term operation, which greatly exceeds the delay time required by the national standard, giving people a feeling of stuttering, and only powering off the camera. Only then can you return to normal. For this situation, we recommend that you choose a large brand of equipment, and monitor the product brand after sale.
Cause two: The decoding capability of the decoder is insufficient
For customers using network HD DVR display storage, the decoding capability of the selected network HD DVR will also affect the smoothness of the picture. If the connected picture exceeds the decoding capability of the decoder, or the core chip selected by the DVR itself processes If the ability is not strong, it will cause the picture to freeze.
Cause three: Insufficient NVR resources
For many monitoring projects, everyone likes to load the NVR fully, or the pixels connected to the camera are too high, and beyond the capacity of the NVR, there will be insufficient NVR resources, which may cause the screen to freeze or not display. You can reduce the bitstream or reduce the connection Into the amount to solve.
Cause four: The quality of the network cable is too poor or the distance is too far
The quality of the network cable used is too poor, and oxygen-free copper materials are not used. It is generally recommended that the long-distance transmission distance of the regular national standard network cable is not more than 100 meters, and the transmission performance of the inferior network cable will be greatly reduced. If the inferior network cable is used, the early picture may be normal, and the signal will be lost due to the oxidation of the line in the later period. Intermittent time and time, picture freeze and other phenomena. In this case, it is recommended to choose a good quality national standard network cable during construction.
Cause five: The switch selection and network structure are unreasonable
The choice of the switch will also directly affect the smoothness of the screen. If the selected switch is a non-wire-speed switch, it will cause the screen to freeze. When choosing a switch, you ca n’t just look at the packet forwarding rate and the backplane bandwidth, especially the choice of the core switch. At present, many domestic manufacturers are very vague about the data of the packet forwarding rate and the backplane bandwidth, which cannot reflect the switch ’s Real performance, so be sure to choose a big brand when choosing a core switch to learn more about the purpose and parameters of the switch.
It is recommended to use a 100M switch under 8 points, and a switch with a Gigabit upload port is required for more than 8 points. More than 50 points require a three-layer convergence network structure, and the core switches need to be big brands.
For the phenomenon of screen freeze, it can usually be solved by reducing the code stream or frame rate. However, although this improves the smoothness of the screen, it is at the expense of the sharpness of the image. High, it is not recommended to use, you need to find the root cause of the problem to solve it.
supplement:
Finally, the weak electric industry network added a problem, which is also relatively common.
The monitoring preview itself is very smooth, there is no stutter, but it is stuck during playback?
This situation is generally caused by the low reading speed of the hard disk used or the low hardware configuration of the hard disk video recorder itself that is related to the read and write performance. You can use the backup method to back up the surveillance videos to a USB flash drive, and then view them on an ordinary computer. In addition, it is recommended to use a dedicated hard disk for monitoring. Pay attention to the parameters when purchasing the hard disk.
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