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IP video surveillance system based on streaming media technology by guard summer
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IP video surveillance system based on streaming media technology |
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Science & Technology,Telecommuting,Electronics
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IP video surveillance system storage server and streaming media server is a high-performance computers, streaming media server for streaming video from the front of the camera, and then the video stream copying, distribution to the storage server. Because IP video surveillance systems, the storage requirement is basically around the clock real-time storage, so this way distributed video storage server's video stream will be a steady stream always exist. If the client software or decoders on the wall requires real-time video stream, streaming media server and then copied all the way or several video streams to the client and the decoder on the wall. This structure, the working pressure mainly in the streaming media server, a server forwarding capability is limited, if the system is a HD ip camera, the forwarding number will be significantly reduced. Besides storage, the main function of the system memory and disk arrays from the storage server to complete, the storage server role is from a streaming media server for streaming video, and then packaged into a file format and then sent to the disk array preservation, storage servers and disk arrays here will have two connections: one is through the IDE or SATA cable is connected directly, or DAS way; Another way is through the network, namely NAS / IPSAN way. The biggest problem is that the system structure of the number of servers will be a lot more points for especially large-scale monitoring system, which will obviously increase the system cost and maintenance complexity. The same time as streaming media servers and storage servers are ordinary PC servers, which are basically running WINDOWS-based development program, and its stability that there are some risks. Improved structure of IP video surveillance system is mainly to streaming media servers and storage servers as two separate functional modules combined installed on a single server, this system not only reduces the number of servers, but also through internal computer The bus will be streaming video to memory modules, reduce network bandwidth pressure, while the storage module for streaming video stream forwarding module is also more reliable and stable. However, the storage module into the video data processing document package will sent through the network to a disk array storage, which still consumes network bandwidth resources. Embedded NVR storage section appears to solve the problem of insufficient stability, the structure will be embedded NVR NVR original integrate servers and disk arrays, typically the server nose plus certain bay storage configuration, the system software from the previous WINDOWS-based storage software into embedded software run more stable and reliable, with the advent of embedded NVR, a considerable part of the structure of IP video surveillance system evolved into the form described in Figure 3. Since the early embedded NVR storage capabilities have only forwards rather than with video function, so the streaming media server systems continue to exist, but the memory becomes a integral part of the embedded NVR devices, in addition to storing more stable and reliable, NVR access to streaming video stream transmitted to the rest of the work completed within the machine are no longer sent to the video data transferred on the network independent disk array, which reduces the network bandwidth pressure. Embedded NVR IP video surveillance system soon became a very important part, in addition to storage, more features are added to the embedded NVR, the most important of which is the video stream forwarding features and video management capabilities, the original system mid-stream media server will no longer need to make embedded NVR video management capabilities with the ability to separate small systems constituted in similar neighborhoods, stores and the like projects, embedded NVR is the core of the system, with all IP digital surveillance system the main function, in large systems, embedded NVR will serve as a basic unit into the entire system. This is the current mainstream of IP video surveillance system architecture. Systems Management Server, in addition to indispensable, the embedded NVR become components of the system base unit with video forwarding and storage capabilities. These NVR units be configured directly from the jurisdiction of the front-end ip camera for video streaming, if no real-time view of the outside world needs, then directly to the video stream into a file package stored in the machine's disk array, if there is from the client Or browse the decoder real needs, you respond to these needs, copied or some other way video stream forwarding to the client software or decoder. Structure of the system is more simple and clear, network bandwidth, a substantial pressure drop. In fact, essentially the same as the above-mentioned several structures are based on streaming media technology to achieve browsing and storage. These types of structures there are two problems: View video streaming and storing the video stream from the same source, the application up and not flexible enough. Specifically, in this based on streaming media technology, structure, streaming part (whether functional module or standalone device) will get a video stream from the front, and then forwarded to the store or browsing device. If the front of the camera is a HD ip camera, users save HD video, so browsing is bound to be high-definition video, a client computer over nine-way HD video decoding may be much. Furthermore if a customer's storage space is limited, but want to browse high-definition video storage standard definition video, in this structure, if not special treatment is also difficult to achieve. A more practical needs are required to store high-definition video, but the browser is not required to always be high-definition video, when the client on the screen to open nine or 16-screen, single screen resolution is not high definition has not come out, then completely SD or smaller display resolution video, the client computer to decode these non-HD video will be relatively easy, the screen is also higher fluency, when cut back to a single screen, only need to display high-definition video.
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IP video surveillance, HD ip camera,
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