Both digital video recorders (DVR) and digital video servers (SVR) are devices used for video surveillance. DVR / SVR takes analog video signals from multiple analog surveillance cameras and digitizes them. The processing engine encodes the video stream in a digital format (such as H.264, dynamic JPEG, MPEG-4, or a dedicated codec). DVR is used to store and view this video stream locally. SVR uses TCP / IP protocol to send encoded video to a large secure network. The higher performance DVR / SVR also has analysis functions, allowing automatic motion monitoring, virtual fence crossing, and so on. DVR and SVR are used to upgrade existing security systems based on analog surveillance cameras. Instead of tape-based VCRs, DVR / SVR automates the storage of surveillance data and allows remote access to surveillance installations via TCP / IP networks. DVR / SVR usually has 4, 8, or 16 input channels. For further integration, the channel count will be increased to 32, 64 and higher.
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