Video Storage & Retrieval Systems Flashcards

What does DVR stand for in CCTV storage systems?

Answer: Digital Video Recorder

DVR stands for Digital Video Recorder, the device that captures and stores analog camera footage in digital format.

Which storage technology is most commonly used in modern NVR systems?

Answer: Hard disk drives or SSDs

Modern NVR systems use hard disk drives (HDDs) or solid-state drives (SSDs) due to their high capacity, reliability, and random-access capability.

What is the primary difference between a DVR and an NVR?

Answer: DVRs process analog signals while NVRs process IP camera streams

DVRs process and encode analog video signals locally, while NVRs record pre-encoded digital streams from IP cameras over a network.

Video retention policy refers to:

Answer: The length of time recorded footage must be kept before overwriting

A video retention policy defines the minimum and maximum duration that recorded footage must be preserved before it can be overwritten or deleted.

Which video compression codec is most widely used in modern CCTV IP camera systems?

Answer: H.264 (AVC)

H.264 (AVC) is the industry-standard codec for CCTV because it provides high-quality video at significantly reduced file sizes compared to older formats.

What happens during a 'continuous loop' recording setting on a DVR/NVR?

Answer: New footage overwrites the oldest recordings once storage is full

Continuous loop recording automatically overwrites the oldest stored footage once available storage is exhausted, ensuring uninterrupted recording.

When calculating required storage capacity, which factor does NOT directly affect the calculation?

Answer: Color of the camera housing

The physical color of the camera housing is cosmetic and has no effect on the data generated or storage requirements.