Data Size and Bit Rate Estimates

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Data Size and Bit Rate Estimates
The hard disk capacity required for recording depends on camera configurations, recording times, and other factors.
Determine the necessary hard disk capacity using the Required Disk Space Calculator available from the Canon website or by
referring to the Data Size and Bit Rate Estimates tables.
Determine the following conditions beforehand.
• Number of cameras
• Video size, video quality, and frame rate of cameras
• Daily recording time
Note
The estimates assume continuous recording at a fixed frame rate (number of frames per second), video size, and quality.
The hard disk capacity required for recording is calculated using the data from the Data Size and Bit Rate Estimates tables and the
following formulas (B: Byte, b: bit).
JPEG video
data size per frame × frame rate × number of cameras × 60 sec. × 60 min. × daily video recording time × number of video recording
days
H.264 and MPEG-4 video
bit rate × number of cameras × 60 sec. × 60 min. × daily video recording time × number of video recording days
Audio
8 KB × number of cameras × 60 sec. × 60 min. × daily audio recording time × number of audio recording days
Sample calculations for each video format are shown below, assuming 1000 Kbps = 1 Mbps for the network bandwidth, and 1024 KB
= 1 MB for the disk capacity.
Example 1: JPEG recording
• Video recording from 16 cameras (VB-R11VE).
• Video size is 320 x 240 and video quality is 6 (data size per frame: 12.04 KB).
• Recording frame rate is 2 fps.
• Data size per second is approximately 24.08 KB (= 12.04 KB x 2 fps).
Although the actual recording data size depends on the objects recorded by each camera, this calculation assumes the typical
sizes given above.
• Audio is recorded from 2 cameras.
The required hard disk space for recording video is approximately 31.7 GB per day (= 24.08 KB x 16 cameras x 60 sec. x 60 min. x
24 hours = 33,288,192 KB).
The required hard disk space for recording audio is approximately 1.3 GB per day (= 8 KB x 2 cameras x 60 sec. x 60 min. x
24 hours = 1,382,400 KB).
Example 2: MPEG-4 recording
• Video recording from 8 cameras (VB-C60).
• Video size is 320 x 240 and video quality is 3.
• Recording frame rate is 30 fps.
• Bit rate is 1.20 Mbps.
Although the actual recording data size depends on the objects recorded by each camera, this calculation assumes the typical
sizes given above.
The required hard disk space for recording video is approximately 101 GB per day (= 1.20 Mbps x 8 cameras x 60 sec. x 60 min. x
24 hours = 829,440 Mb=103,680 MB).
Example 3: H.264 recording
• Video recording from 8 cameras (VB-R11VE).
• Video size is 320 x 240 and video quality is 6.
• Recording frame rate is 30 fps.
• Bit rate is 0.53 Mbps.
Although the actual recording data size depends on the objects recorded by each camera, this calculation assumes the typical
sizes given above.
The required hard disk space for recording video is approximately 45 GB per day (= 0.53 Mbps x 8 cameras x 60 sec. x 60 min. x
24 hours = 366,336 Mb=45,792 MB).
Introduction
Important
• The actual data size may increase or decrease depending on the objects being recorded. Make sure to confirm the data size for the actual
system environment before starting operation.
• Note that the actual recording file size may be different from the size in the table, depending on the weather conditions and the complexity of the
scene. For example, video of an empty corridor would typically result in values smaller than the above values. Conversely, complex scenes, such
as a crowded shopping mall, would result in larger values.
Calculating the Hard Disk Capacity Required for Recording
Important
We recommend that you add more than 20% space to the calculated hard disk capacity.
Calculation Examples