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| For proper operation of video archive recording the disk space size must exceed «Ring» parameter, that has been stated in Video Subsystem section section of advanced system settings utility (see The settings panel for the Video subsystem section). |
To determine disk space required for storing archive from IP-cameras, please use the on-line calculator. Documentation on the calculator is available here .
Table below shows the average frame size of a PAL video signal depending on frame resolution, video signal compression, color grade of the image and frame resolution, frame chromaticity and motion level in the frame.
Video card type | Resolution | Colour | Frame size (Kb) with 50% of motion in the frame | Frame size (Kb) with 75% of motion in the frame | Frame size (Kb) with 100% of motion in the frame |
SC390N16 (WS16) | 704x576 | colour | 15 | 30 | 61 |
black-and-white | 10 | 22 | 42 | ||
704x288 | colour | 6 | 10 | 30 | |
black-and-white | 4 | 9 | 18 | ||
352x288 | colour | 4 | 6 | 17 | |
black-and-white | 2 | 5 | 10 | ||
SC3B0N16 ( WS216) | 704x576 | colour | 19 | 35 | 101 |
black-and-white | 11 | 33 | 65 | ||
704x288 | colour | 8 | 12 | 49 | |
black-and-white | 6 | 11 | 29 | ||
352x288 | colour | 4 | 7 | 25 | |
black-and-white | 3 | 6 | 15 | ||
FX416\MS416 | To calculate required disk space for these cards, please use the on-line calculator. | ||||
SL16-200 (FX116) | |||||
SC310N16 (FX16) | |||||
SC200Q4 (FS15) SC200Q4 LOW PROFILE (FS115) SC300Q16 (FX4) SC300D16 (FX8) SC230N4 SC330Q16 (analogue of SC300Q16) SC330D16 (analogue of SC300D16) | |||||
FS5\FS6\FS8\FS16 | 704x576 | colour | 26 | 59 | 103 |
black-and-white | 24 | 42 | 91 | ||
704x288 | colour | 17 | 26 | 52 | |
black-and-white | 16 | 24 | 47 | ||
352x288 | colour | 11 | 15 | 39 | |
black-and-white | 10 | 14 | 37 | ||
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| Table Table shows the examples of frames for video cameras with set frame frequency – 25 f\s. |
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Comments relating to Formula no. 1. To estimate the archive size, the following should be performed: the size of hard drive in Kb (the rates for converting Gb into Kb are included into the numerator of Formula no. 1) divide by the frame size, defined in Table A as a function of video signal parameters, and by the frame rate per camera and the number of cameras, connected to the video server. Archive size in this case will be measured in seconds. Now, the archive size expressed in seconds should be converted to the number of days (the rates to convert seconds to days are given in the denominator of Formula no. 1).
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Archive size can also be calculated from a simplified formula, where numerical conversion factors are reduced to a numerical value (Formula no 2). Archive size (days) = 12 (Kb/Gb * day/sec) * Hard drive size (Gb) / ( Frame size (Kb) * Frame rate (frames/sec) * Number of cameras) |
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Example. If the size of a hard drive, for instance, is 40 GB, 4 cameras are continuously recording PAL video signals with 10 frames per second and 150Kb frame size. Based on the formula, you work out:
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Table below shows archive sizes calculated for hard drives of various sizes, based on a continuous incoming PAL video signal recording, from 1 camera with a frame rate of 25 f/sec.
Resolution | Hard drive size | |||
80 GB | 160 GB | 400 GB | 750 GB | |
352x288 b/w | 2,1 | 4,3 | 10,7 | 20,0 |
352 x 288 color | 1,9 | 3,8 | 9,6 | 18,0 |
704x288 b/w | 1,6 | 3,2 | 8,0 | 15,0 |
704 x 288 color | 1,5 | 3,1 | 7,7 | 14,4 |
704x576 b/w | 1,2 | 2,3 | 5,8 | 10,9 |
704 x 576 color | 1,1 | 2,3 | 5,6 | 10,6 |
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