CCTV Video Recording and Storage 3

Question 1

What is the primary advantage of H.265 over H.264 in CCTV storage?

Accepted Answer

Approximately 50% reduction in file size at the same quality

Answer

H.265 (HEVC) achieves roughly 50% better compression efficiency than H.264, significantly reducing storage requirements.

Question 2

In the context of CCTV, what does 'pre-event buffering' mean?

Accepted Answer

Storing footage captured before a trigger event occurs

Answer

Pre-event buffering continuously holds a rolling window of footage in memory so that video before a trigger (e.g., motion) is also saved.

Question 3

Which storage topology connects NVRs directly to a dedicated storage network separate from the camera network?

Accepted Answer

SAN (Storage Area Network)

Answer

A SAN provides a high-speed dedicated network for storage devices, keeping storage traffic separate from the IP camera data network.

Question 4

What does 'variable bitrate' (VBR) recording mean in CCTV systems?

Accepted Answer

The bitrate adjusts based on scene complexity to optimize storage

Answer

VBR dynamically adjusts the data rate — using more bits for complex scenes and fewer for static ones — to balance quality and storage efficiency.

Question 5

A CCTV installation requires 90 days of retention for 16 cameras each generating 2 GB/day. What total storage is needed?

Accepted Answer

2,880 GB

Answer

16 cameras × 2 GB/day × 90 days = 2,880 GB of total storage required.

CCTV - Closed Circuit Television Practice Test