Vivotek SF8174 User Manual download pdf (Page 75)

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User's Manual - 75

■ Intra frame period

Determine how often to plant an I frame. The shorter the duration, the more likely you will get better

video quality, but at the cost of higher network bandwidth consumption. Select the intra frame period

from the following durations: 1/4 second, 1/2 second, 1 second, 2 seconds, 3 seconds, and 4 seconds.

■ Video quality

• Constant 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, and

16Mbps

. 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 sometimes be

compromised. If Image quality priority is selected, the Network Camera might 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 gain.

You may also manually enter a bit rate number by selecting the Customized option.

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Vivotek SF8174 User Manual Page 75