Key concepts
Page 11
FortiRecorder 2.4.2 Administration Guide
Table 1:
Bitrate table (H.264 estimate) in Mbps with high quality image (x0.7 = standard quality)
Please note that these are estimates providing a high quality image under most conditions. If
the scene is less complex (indoors with little detail and not much motion) or the camera has very
little noise (daylight, good DNR) the bit rate can be lowered further. Generally do not use less
than half of the indicated values.
If video compression is set to lower quality or capped at a defined max bandwidth, the bit rate
can be significantly lower at the cost of lower image quality. DNR can further reduce bandwidth,
especially for grainy night images, but shows less detail during motion.
Storage capacity
We will use FortiRecorder 100D, 200D and 400D configuration with different camera parameters
to demonstrate the video retention period.
FortiRecorder 100D has a built in 1 TB hard drive and it can connect up to 16 cameras. We
configure 16 cameras with 1280 x 720 resolution using 30 FPS with high quality image in
continuous recording. Each camera will generate an estimated bandwidth of 2 Mbps. Referring
to the FortiRecorder Capacity calculator spreadsheet below, 100D can store approximately 3.2
days of video footage.
Table 2:
Capacity Calculator
FortiRecorder 200D has 3 TB HD capacity. With the same configuration it can record 16
cameras for 10 days.
FortiRecorder 400D has 6 TB HD capacity. With the same configuration it can record 16
cameras for 19 days.
Frames/s
1
6
10
15
30
CIF
(352x240)
0.16
0.2
0.24
0.3
0.4
D1 0.4M
(720x576)
0.4
0.5
0.6
0.75
1
720p 1M
0.8
1
1.2
1.5
2
SXGA 1.3M
(1280x1024)
1
1.25
1.5
1.9
2.5
HD 2M
(1920x1080)
1.6
2
2.4
3
4
3M
2
2.5
3
3.75
5
5M
3.2
4
4.8
6
8
Bit rate
(Mbps)
HD
Capacity
(TB)
Cameras
(#)
Usage
(%)
Time
(days)
Input
2
1
16
100
30
Resolve each for all other inputs as specified
Result
0.2
9.4
1.7
11
3.2
