Background Analysis
In recent years, domestic video surveillance applications have developed rapidly, and the scale of system access has continued to expand. A large number of platform providers have emerged. The platform providers have different access protocols. Terminal manufacturers need to provide various types of terminal maintenance services for each terminal. The software version of the platform has caused a huge waste of resources. After the large-scale construction of videos in various places, provincial and national levels have centralized access, and the need to control the scene and conduct command and dispatch through video for major events has gradually emerged. However, there is a lack of unified interoperability protocols between different platforms. Under such an industrial background, GB/T28181 came into being based on the demand for terminal standardization and platform interconnection.
Concept analysis
GB/T28181 protocol "Technical Requirements for Information Transmission, Exchange, and Control of Security Video Surveillance Networking Systems" was proposed by the Science and Technology Information Bureau of the Ministry of Public Security and is under the jurisdiction of the National Security Alarm System Standardization Technical Committee (SAC/TC100). A national standard jointly drafted by a number of institutions including one. The GB/T28181 protocol is essentially the same as ONVIF, and its purpose is to reduce the difficulty of interconnecting video surveillance equipment. This protocol is based on IP network. If you want to connect, you need relevant protocol conversion module.
There is no contradiction between the protocols and they can complement each other in terms of access. GB/T28181 includes not only the cascade between devices, but also the cascade of systems, so there is no contradiction. For example, the network camera is connected to the NVR through the ONVIF protocol, and the NVR is connected to the platform through the GB/T28181 standard, or the network camera is connected to the platform through the ONVIF protocol, and the cascade between platforms is carried out according to the GB/T28181 standard. Therefore, ONVIF and GB/T28181 often play complementary roles, allowing for wider equipment selection and promotion.
At the same time, the GB/T28181 platform server has a modular design and supports distributed deployment. It has device management module, signaling module, streaming media module and storage module. Supports the deployment of multiple central signaling servers and multiple streaming media load balancing. The streaming media module supports protocol access such as RTSP and RTMP. Supports PTZ control of incoming cameras. It fully meets the compatible deployment of newly constructed digital surveillance networks and partially constructed digital surveillance networks.
Regional cascade resource sharing
GB/T28181 supports regional platform cascading and builds a three-level platform cascading model. Regional cascading can effectively solve resource sharing problems, allowing high-level security platforms at the administrative level to view video resources of subordinate units.
According to the GB28181 national standard agreement, the liveweb streaming media platform, a video streaming service based on the national standard, has been successfully connected to major national standard equipment platforms through internal testing and actual user on-site joint debugging.
