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Network video recorder
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<p>A network video recorder (NVR) is a specialized computer system that records video to a <a href="/facts/Disk_drive/hnsXRb5X">disk drive</a>, <a href="/facts/USB_flash_drive/Jv0qmTCF">USB flash drive</a>, <a href="/facts/Memory_card/Rwy2lKS2">memory card</a>, or other <a href="/facts/Mass_storage/p4DHVtbY">mass storage</a> device. An NVR itself contains no cameras, but connects to them through a network, typically as part of an <a href="/facts/IP_video/45X46Bgf">IP video</a> surveillance system. NVRs typically have <a href="/facts/Embedded_operating_system/0ue9DzHw">embedded operating systems</a>. </p><p>As a more flexible and serviceable alternative to NVRs, ordinary computers may be equipped with video management software (VMS). </p><p>NVRs differ from <a href="/facts/Digital_video_recorder/g8V6BsU5">digital video recorders</a> (DVRs), as an NVR's input is from a network rather than a direct connection to a <a href="/facts/Video_capture/D4HgJ7As">video capture</a> card or <a href="/facts/TV_tuner_card/xDY4otBq">tuner</a>. Video on a DVR is encoded and processed at the DVR, while video on an NVR is encoded and processed at the camera, then <a href="/facts/Video_streaming/4rPhSq0Y">streamed</a> to the NVR for storage or remote viewing. Additional processing may be done at the NVR, such as further compression or tagging with <a href="/facts/Metadata/qt35z79C">metadata</a>. </p><p>Hybrid NVR/DVR surveillance systems exist which incorporate functions of both NVR and DVR. </p>