DVS archiving is the process of recording live video streams for later review. Archiving can be for a single day, or 45 days, or more. It can be 24/7 or linked to motion detection to save storage space. Storage consists of the physical hard drives that hold the video recordings. Such units are usually called digital video recorders (DVRs) or networked video recorders (Wireless Security Cameras ). DVRs come in all shapes and sizes, including the satellite or cable set-top box DVR, the sole purpose of which is to record streaming video provided for entertainment and education. There are video surveillance DVR systems that, like the television set-top box, provide the controls to review recordings on a digital or analog monitor, directly off the internal hard drive. The larger implementations use storage area networks (SANs), which are networks specifically dedicated to transporting data for storage and retrieval. SAN architectures expand data storage on server hard drives by linking the storage capacity to other arrays through fiber optics.
Any DVR is really just a computer with hard drives, including a video encoder with coaxial ports for analog cameras. A hybrid DVR may also include the capacity to accept IP cameras by adding the encoding function within the software. Each camera uses a unique codec for video encoding and a software driver for PTZ and edge storage ( Small GPS Tracker ) compatibility. The ONVIF standard has made possible interoperability between cameras and DVRs, only if the camera and DVR are 100% ONVIF compliant. You may have ONVIF compliance using MJPEG for video and limited to PTZ functions but incapable of using the audio and edge storage functionality. A self-contained DVR has an operating system that is PC-based or uses an embedded proprietary operating system. The embedded systems are simplistic and inaccessible other than configuration capabilities (usually an open-source version of Linux). These units may also have limitations in capacity, not due to lack of space inside the unit, since hard drives keep on growing in storage capacity, but in terms of what the embedded software can recognize.
It’s the same reason that a 2001 computer wouldn’t be able to read a 1 terabyte (TB) hard drive. Nevertheless, a DVR is still just a central processing unit ( GPS Rear View Mirror Camera ), video graphics card, memory, and hard drive space whose function for the purposes of DVS is not recording television shows but instead recording video surveillance footage for as long as there is hard drive space to hold the files or the schedule time. Long-term archiving and easy access to that archived video surveillance footage are the most powerful fundamentals of DVS, and the introduction of DVR units made them possible. The typical DVR includes a host application running on top of an embedded operating system, usually a license-free Linux or Windows 7. The embedded video surveillance application and operating system provide an “appliance” rather than a computer, streamlining the process of installation, maintenance, and support. The Genetec Security Center includes the Omnicast video surveillance VMS software, the Synergis Access Control software, and the AutoVU license plate recognition software. If any cameras are added, the user will need to install another unit, configuring the two to communicate over the network.
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