Specifications

109
MPEG-4 calculation:
Approx. bit rate / 8(bits in a byte) x 3600s = KB per hour / 1000 = MB per hour
MB per hour x hours of operation per day / 1000 = GB per day
GB per day x requested period of storage = Storage need
Note: The formula does not take into account the amount of motion, which is an important
factor that can inuence the size of storage required.
Table 12.1b
Motion JPEG calculation:
Image size x frames per second x 3600s = Kilobyte (KB) per hour/1000 = Megabyte (MB) per hour
MB per hour x hours of operation per day / 1000 = Gigabyte (GB) per day
GB per day x requested period of storage = Storage need
Table 12.1c
Camera Resolution
Approx. bit rate
(Kbit/s)
Frames per
second
MB/
hour
Hours of
operation GB/day
No. 1 CIF 170 5 76.5 8 0.6
No. 2 CIF 400 15 180 8 1.4
No. 3 4CIF 880 15 396 12 5
Total for the 3 cameras and 30 days of storage = 204 GB
Camera Resolution Bit Rate (Kbit/s)
Frames per
second
MB/
hour
Hours of
operation GB/day
No. 1 CIF 13 5 234 8 1.9
No. 2 CIF 13 15 702 8 5.6
No. 3 4CIF 40 15 2160 12 26
Total for the 3 cameras and 30 days of storage = 1002 GB
BANDWIDTH AND STORAGE CONSIDERATIONS - CHAPTER 12