CCTV Video Recording and Storage 2

Question 1

What does the term 'compression ratio' refer to in video storage?

Accepted Answer

The ratio of original file size to compressed file size

Answer

Compression ratio describes how much the original video data has been reduced in size after encoding.

Question 2

Which RAID level provides disk striping with parity, requiring a minimum of 3 drives?

Accepted Answer

RAID 5

Answer

RAID 5 uses block-level striping with distributed parity data across at least 3 drives, allowing one drive failure without data loss.

Question 3

In NVR systems, what primarily determines the maximum number of cameras supported?

Accepted Answer

Processing power and licensed channel count

Answer

NVR channel capacity is limited by its processing power for decoding streams and the number of licensed channels.

Question 4

What is 'continuous recording' mode in a DVR/NVR?

Accepted Answer

Recording around the clock regardless of activity

Answer

Continuous recording captures video 24 hours a day, 7 days a week without gaps.

Question 5

Which video codec is most commonly used in modern IP camera systems for efficient compression?

Accepted Answer

H.264

Answer

H.264 (AVC) is the industry standard for IP camera systems due to its excellent compression efficiency and broad hardware support.

CCTV - Closed Circuit Television Practice Test