Axis Communications 2460 - Manual (Page 52)

Recording Storage and Reduction AXIS 2460 User’s Manual 52
Approximate Storage Times
The table below shows approximations of: a) the total recording storage time in days and,
b) the number of days until the first frame rate reduction. These are shown as total/first
reduction. The basis for the examples is as follows:
• four 40 GB hard disks installed
• a recording frame rate of 1 fps per camera
• recording on 4 cameras from an indoor office scene.
Priority
If the Recording Mode is best explained as a function that reduces the frame rate of
recordings stored in the AXIS 2460, then Priority can be described as the means of
controlling the speed of the Recording Mode. The higher the priority, the more the
reduction process will be slowed down. The maximum storage time (i.e. the slowest
reduction) for a recording will thus be achieved by setting the Recording Mode to Extended
Long and the event’s priority to Top.
It is also important to understand that priority is comparative, that is, it will only be
relevant when there are recordings that use different priorities. Setting e.g. Top priority for
all events/recordings would be meaningless.
An event’s Priority is set when creating the event.
Image
Resolution
Modulation
Image
Compression
Image
file size
Storage Time for Recording Mode
NTSC PAL Normal Extended Extended Long
QCIF (low) 176 x 112 176 x 144 High 3 kB 126/- 268/67 702/11.5
QCIF 176 x 112 176 x 144 Normal 4 kB 94/- 199/50 522/8.5
QCIF 176 x 112 176 x 144 Low 8 kB 45/- 96/24 253/4
CIF (Normal) 352 x 240 352 x 288 High 8 kB 45/- 96/24 253/4
CIF 352 x 240 352 x 288 Normal 13 kB 27/- 57/14 149/2.5
CIF 352 x 240 352 x 288 Low 17 kB 20/- 42/10 110/2
4CIF (High) 704 x 480 704 x 576 High 24 kB 13/- 28/7 73/1
4CIF 704 x 480 704 x 576 Normal 36 kB 7.5/- 16/4 43/0.5
4CIF 704 x 480 704 x 576 Low 61 kB 3.5/- 7/1.5 18/0.3