Digital Video Recorder User Manual
113
Appendix B
Calculation of Recording Capacity
Users can calculate the size of hard disk according to the saving time and DVR recording settings. The DVR uses fixed
video bit rate. The below are the details at different settings for 200 fps 8-channel DVR.
Video
Format
Resolution
Farm Rate Totally
(FPS)
Video Quality
Bit Rate
(kbps)
Used Space
(MB/h)
PAL CIF
25
Highest 640 281
Higher 512 225
Medium 384 168.7
Lower 256
112.5
Lowest 128 56
NTSC CIF
30
Highest 640 281
Higher 512 225
Medium 384 168.7
Lower 256
112.5
Lowest 128 56
The calculation format is:
Total Recording capacity =Used space per hour (MB/h)
(coverage rate of hard disk)
× recording time (hour) ×channel numbers
For instance, one customer uses NTSC cameras, set resolution to CIF, video quality to Lower, frame rate to 240 fps for
enabling total 8 channels. He wants the unit to record continuously in a month. Below is the calculation:
Total Recoding capacity =112.5(mb/h) X 24(hours/day) X30(days) X8(channels)
= 648000(MB)
