VIVOTEK
User's Manual - 73
■ B
it rate control
Constrained bit rate:
A complex scene generally produces a larger file size, meaning that higher bandwidth
will be needed for data transmission. The bandwidth utilization is configurable to
match a selected level, resulting in mutable video quality performance. The bit rates
are selectable at the following rates: 20Kbps, 30Kbps, 40Kbps, 50Kbps, 64Kbps,
128Kbps, 256Kbps, 512Kbps, 768Kbps, 1Mbps, 2Mbps, 3Mbps, 4Mbps, 6Mbps,
8Mbps, 10Mbps,
12Mbps, 14Mbps, ~ to 80Mbps. You can
also select
Customize
and manually enter a value up to 40Mbps.
•
- Target quality
:
Select a desired quality ranging from Medium to Excellent
- Maximum bit rate
: select a bit rate from the pull-down menu. The bit rate ranges
from 20kbps to a maximum of 40Mbps. The bit rate then becomes the Average or
Upper bound bit rate number. The Network Camera will strive to deliver video streams
around or within the bit rate limitation you impose.
- Policy:
If Frame Rate Priority is selected, the Network Camera will try to maintain
the frame rate per second performance, while the image quality will be compromised.
If Image quality priority is selected, the Network Camera may drop some video
frames in order to maintain image quality.
Smart Q:
Select ON or OFF to enable or disable the feature. Smart Q is scene-aware.
The Smart Q reduces
frame size and bit rate consumption through the following:
■
Dynamically adjusting the image quality for scenes in different luminosities while
keeping the same imaging quality in low light.
■
Endorsing different qualities for the I frames and P frames.
■ Dividing a sin
gle frame into different sections, and giving these sections different
quality values. For a highly complex image section (high frequency area), such
as an area with dense vegetation, screen windows, or repeated patterns (wall
paper), having a lower quality actually poses little effects on human eyes.
Maximum bit rate:
With the guaranteed image quality, you might still want to place
a bit rate limitation to control the size of video streams for bandwidth and storage
concerns. The configurable bit rate starts from 1Mbps to 40Mbps.
The Maximum bit rate setting in the Fixed quality configuration can ensure a
reasonable and limited use of network bandwidth. For example, in low light conditions
where a Fixed quality setting is applied, video packet sizes can tremendously
increase when noises are produced with electrical gains.
You may also manually enter a bit rate number by selecting the
Customized
option.
Fixed quality:
On the other hand, if
Fixed quality
is selected, all frames are transmitted with the
same quality; bandwidth utilization is therefore unpredictable. The video quality
can be adjusted to the following settings: Medium, Standa
rd, Good, Detailed, and
Excellent. You can also select
Customize
and manually enter a value.
Summary of Contents for MS9321-EHV
Page 82: ...VIVOTEK 82 User s Manual...
