Bedienungsanleitung Vivotek FD8131V Dome (Seite 49 von 170) (Englisch)

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VIVOTEK

User's Manual - 49

The frame rate will decrease if you select a higher resolution.

■ 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:

• 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

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, 16Mbps, 18Mbps, and 20Mbps

. You can also select

Customize and manually enter a value.

- Target bit rate: select a bit rate from the pull-down menu. The bit rate ranges

from 20kbps to a maximum of 20Mbps. The bit rate then can be a limiting factor for

controlling the quality and the bandwidth consumed for transmitting this video stream.

This bit rate restriction method is particularly useful when planning a conguration

consisting of numerous cameras where video streams can produce high demands

both on network bandwidth and storage space. For example, storing a 6Mbps stream

for 24 hours requires a 63GB disk space. The Network Camera will strive to deliver

video streams 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 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. If

Fixed quality is selected, frame rate performance will be compromised if maximum

bit rate is reached (see below).

- Quality: You can select the following quality options - Medium, Standard,

Good, Detailed, and Excellent. The image quality will then be determined by the

compression rate. For example, a lower quality means a higher compression rate.

Aggressive compression rate will introduce artifacts. The higher the compression

rate, the higher the possibility of image noises around contrasting edges, etc. You

can also select Customize and manually enter a logical value from 0 to 51.

- 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.

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

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