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VIVOTEK
User's Manual - 77
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Video quality
Constant bit rate:
• Constant bit rate: A complex scene generally produces a larger le size, meaning that
higher bandwidth will be needed for data transmission. The bandwidth utilization is
congurable 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 32Mbps
. You can also select Customize and
manually enter a value up to 40Mbps.
- Target bit rate: select a bit rate from the pull-down menu. The bit rate ranges from
20kbps to a maximum of 16Mbps. 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.
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Endorsing different qualities for the I frames and P frames.
■ Dividing a single 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.
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