Wuxi Security Monitoring - HD network video camera The image definition has made a qualitative leap, but it also brings a series of practical problems to the high-definition monitoring system. The three core problems to be solved by HD monitoring are: bandwidth problem, display problem, and storage problem.
1、 Bandwidth problems
Due to the limited network bandwidth at present, the high bit rate brought by high-definition video has become the biggest bottleneck in its promotion. How to transmit high quality video at the lowest possible bit rate is the primary problem to be solved in HD monitoring. At the same time, due to the heterogeneity of the network, different networks have different channel characteristics, and different users enjoy different network bandwidth, even the bandwidth of the same user may change at any time. With the development of the monitoring field, all kinds of user terminals have the need to connect monitoring videos. For example, the bandwidth of the LAN monitoring network is ideal, and users want to browse high-quality videos; However, due to the limited bandwidth in the mobile phone monitoring field, users pay more attention to the smoothness of video at low bit rates. How to adapt to these different bandwidth environments is also a problem that HD monitoring equipment needs to solve.
2、 Show problems
Compared with standard definition video, high-definition video has a large amount of information, and the corresponding requirements for decoding and display performance have also been greatly improved. For example, the current mainstream PC can easily decode and display 8-channel D1 standard definition video, but if the front end is 1080P high-definition video, only one channel can be decoded and displayed reluctantly. For large video monitoring platforms, if all high-definition videos are used, The server Decoding pressure will be great.
3、 Storage issues
The improvement of image resolution will inevitably consume more storage space. Taking 1920 × 1080 30 frame video as an example, using H264 encoding algorithm, in order to ensure clarity, the code stream needs to be kept above 6Mbps, which is about 4-8 times that of standard definition video. Under the condition of standard definition video, a 16 channel DVR with 8 built-in 2T hard disks can meet the demand for long-term video storage. In high-definition monitoring, this time will be greatly shortened, which will lead to an increase in storage costs.
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