67
E
Frame Rate
For selecting the acquisition frame rate of the viewer.
In the case of a 1-to-1 connection between VN-C20 and the viewer, it is
recommended that the frame rate of the viewer and VN-C20 be set to the
same value. To play back multiple viewers at different frame rates, set the
frame rate accordingly at the individual viewer.
The frame rate set at the VN-C20 unit will be the upper limit to the
acquisition frame rate of the viewer.
For example, when VN-C20 is set to
A
15 fps
B
, transmission will only be
possible at
A
15 fps
B
even when the client requests for
A
30 fps
B
.
Alternatively, when VN-C20 is set to
A
15 fps
B
and
A
10 fps
B
is requested by
the client, data will be sent at 7.5 fps to enable transmission at even
intervals.
When the frame rate set is smaller than that at the VN-C20 unit, the
frame rate during transmission from VN-C20 decreases when acquisition
is performed via HTTP.
When acquisition is performed via multicast, data volume will not
decrease even when a frame rate that is smaller than that at the VN-C20
unit is set, and the built-in viewer will play back images while skipping
frames.
Selecting a large frame rate will increase the processing load of the
computer on which the viewer is running.
Caution:
●
This is different from the frame rate setting at the VN-C20 unit.
Set to a rate such that the CPU burden of the computer does not
exceed 80%. When the CPU is overloaded, the computer may not
function properly.
F
Time Display Format
Select the format for displaying time.
YYYY,MM,DD denote year, month and day respectively while HH,MM,SS
denote hour, minute and second respectively.
G
Stream
For selecting the protocol when the viewer acquires data from VN-C20.
When
A
HTTP
B
is selected, recovery will be performed via resending
when packet loss occurs. VN-C20 may be monitored using multiple
viewers when
A
Multicast
B
is selected.
Additionally, start multicast sending on the Streaming page of the VN-
C20 unit when playing back via multicast.
Caution:
●
When the built-in viewer is launched with
A
Multicast
B
specified, a
Windows firewall warning may be displayed. In this case, select
A
Unblock
B
and proceed.
●
If
A
Block
B
is selected, the Windows firewall will block the multicast
streams and playback of multicast at the viewer will fail.
H
Multicast Address / Port
For specifying the multicast address and port number.
This is enabled only when
A
Multicast
B
is selected for the [Stream] item.
Specify the same value as the parameter that is set on the [Streaming]
page of VN-C20. (
A
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VN-C20_EN.book Page 67 Tuesday, February 14, 2006 10:51 AM
