Vivotek CC8160 - Page 59

VIVOTEK
User's Manual - 59
■ 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 congurable 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 40Mbps. You can also select Customize and manually enter a value up to
40Mbps.
• - Quality upper bound: Select a desired quality ranging from Medium to Excellent
- Target 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.
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, Standard, Good, Detailed, and Excellent. You can also
select Customize and manually enter a value.
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 congurable bit rate starts from 1Mbps to 40Mbps.
The Maximum bit rate setting in the Fixed quality conguration 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.