VPort 2310 User’s Manual
System Configuration
4-10
Size
There are 5 options for selecting image sizes:
Video Size (unit: pixels)
NTSC
PAL
Half
176
×
112
176
×
112
Half
×
2
352
×
240
352
×
288
Standard
352
×
240
352
×
288
Standard
×
2
704
×
480
704
×
576
Double
704
×
480
704
×
576
NOTE
Half
×
2
consumes the same file size and bandwidth as
Half
, but has the same resolution as
Standard
. For this reason, the visual effect of
Half
×
2
is worse than
Standard
. Likewise,
Standard
×
2
consumes the same file size and bandwidth as
Standard
, but has the same
resolution as
Double
. For this reason, the visual effect of
Standard
×
2
is worse than
Double
.
Modulation
There are 3 types of
Modulation
. Administrators can set the auto-detect condition during
initialization by selecting
Auto
, but can still set it manually by selecting
NTSC
or
PAL
.
Maximum Frame Rate
Administrators can set up the maximum frame rate of the video stream manually to save
bandwidth. You may choose from 8 frame rates: 1, 2, 3, 5, 10, 15, 20, 25, and 30. The maximum
frame rate is determined by the
Video Size
. For example, once the video size is set to double, the
maximum frame rate is only 10.
Video Size (unit: pixels)
Maximum Frame Rate
Half 30
Half
×
2
30
Standard 30
Standard
×
2
30
Double 10
Video Quality Control
Video Quality Control
is used to optimize the bandwidth of the MPEG4 video stream. There are
2 modes for video quality control.
1.
Fixed bit rate
: the administrator can fix the bandwidth to tune the video quality and FPS
(frames per second) to the optimum combination. You may choose from 7 bandwidths:
64K
,
128K
,
256K
,
384K
,
512K
,
768K
,
1000K
,
and 1200K bps
. The combination of image
quality and FPS is determined by the bandwidth. For example, the FPS is slow and the
quality is bad at 64 Kbps, and the quality is best at 1200 Kbps. But the FPS is about 10 due to
the limitation of VPort’s system resources.
2.
Fixed Quality
: the administrator can set the image quality to one of 5 standards:
Medium
,
Standard
,
Good
,
Detailed
,
and Excellent
. VPort will tune the bandwidth and FPS
automatically to the optimum combination.
