Vivotek FD8151V User Manual download pdf (Page 56)

VIVOTEK

56 - User's Manual

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:

Target bit rate:

A complex scene generally produces a larger le size, meaning that higher bandwidth

will be needed for data transmission� To regulate the bandwidth consumption and

storage space for recording videos, you can select the Constant bit rate methodology�

The rmware will try its best to contain the size of video packets within the limitation

of a constant bit rate� This methodoloy enables easier calculation of the network

bandwidth and storage space required for live viewing or video recording�

Policy:

- Frame rate priority - Firmware will try to maintain the target frame rate per second,

while the image quality will more or less be compromised�

- Image quality priority - Firmware will try to maintain the quality of the video while the

frame rate (no� of frames per second) may decrease�

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, and 8Mbps

� You can also select Customize

and manually enter a value�

• Fixed quality: On the other hand, if Fixed quality is selected, all frames are

transmitted with the same quality; bandwidth utilization is therefore unpredictable.

When so congured, the frame-rate-per-second performance can be compromised

in the event of insufficient bandwidth or network clogs� The video quality can be

adjusted to the following settings: Medium, Standard, Good, Detailed, and Excellent�

You can also select Customize and enter a number to designate image quality� The

larger the number, the higher the compression rate, and hence image quality is lower�

A small customized quality number means a low compression rate, and thus a high

quality image�

- Maximum bit rate - While you want to ensure a reasonable image quality, you can

still impose an upper threshold on the bandwidth taken for the video transmission�

The congurable bit rate ranges from 1mbps to 40mbps.

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Vivotek FD8151V User Manual Page 56