Vivotek WDR Pro Manuel d'utilisateur télécharger pdf (Page 57)

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User's Manual - 57

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

■ Intra frame period

Determine how often for rmware 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 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,

and 8Mbps

. 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 8Mbps. 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.

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

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Vivotek WDR Pro Manuel d'utilisateur Page 57