Canon VB-C60 - Manual (Page 36)

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System Design Concept
Example 2: MPEG-4 recording
• Using 8 Camera Servers (VB-C60) for recording,
• With each camera set to Medium Size (320 x 240) and Video Quality is set to 3,
• Recording frame rate is set at 30 fps, and
• Data size per second is approximately 150 KB.
Although actual data size depends on objects shot by each Camera Server, this calculation assumes
the typical size shown above.
For the above configuration, when MPEG-4 video from 8 Camera Servers are being recorded continuously at
30 fps all day, every day, the hard disk space required is approximately 99GB per day (=150KB x 8 cameras x
60 seconds x 60 minutes x 24 hours = 103680000KB per day).
* For the above figures please note that the bandwidth is calculated as 1000Kbps = 1Mbps, and the disk size
as 1024KB = 1MB.
The following tables give some typical data sizes per frame (in kilobytes) for various combination of quality and
resolution values referring to a VB-C500VD, VB-C500D, VB-C60, VB-C300 and VB-C50i.
However the actual data size may be different from the data size in the table below depending on the weather
condition and complexity of the image. For example, images of an empty corridor would typically be smaller
than these values and images of an intricate pattern such as a crowded shopping mall may be larger than
these.
Example of frame size with VB-C500VD/VB-C500D/VB-C60* (JPEG)
(KB)
Quality
Resolution
JPEG Small (160x120) JPEG Medium (320x240) JPEG Large (640x480)
1 3.5 9.6 27.5
2 4.0 11.0 31.7
3 4.4 12.5 35.8
4 5.6 16.4 47.8
5 15.8 52.7 171.4