Vivotek FD8372 Manuel d'utilisateur télécharger pdf (Page 59)

VIVOTEK

User's Manual - 59

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 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, 16Mbps, 18Mbps, and

20Mbps. You can also select Customize and manually enter a value.

You should speciy the bit rate setting either as an Average restriction or as an Upper

bound threshold. If set to the Average, video bit rate will uctuate around the Target

bit rate setting.

• 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.

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Vivotek FD8372 Manuel d'utilisateur Page 59