VIVOTEK IP8155 사용자 설명서

 

 

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

■ Intra frame period

Determine how often for firmware 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 

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�

-  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 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 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 configurable bit rate starts from 1Mbps to 40Mbps� In low light 

conditions, lot of noises can be generated and the frame sizes can significantly 

increase. Placing a bit rate limitation can limit the size of frames.  

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

Customized option�