VIVOTEK FE8171V 사용자 설명서

 

 

■ 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

A complex scene generally produces a larger file size, meaning that higher bandwidth will be needed 

for data transmission. Therefore, if 

Constant bit rate is selected, the bandwidth utilization is fixed at 

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, and 12Mbps. You can also select 

Customize 

and manually enter a value.

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.

If 

 mode is selected, the Network Camera continuously sends JPEG images to the client, producing 

a moving effect similar to a filmstrip. Every single JPEG image transmitted guarantees the same 

image quality, which in turn comes at the expense of variable bandwidth usage. Because the media 

contents are a combination of JPEG images, no audio data is transmitted to the client. There are three  

parameters provided in MJPEG mode to control the video performance:

■ Frame size

You can set up different video resolution for different viewing devices. For example, set a smaller 

frame size and lower bit rate for remote viewing on mobile phones and a larger video size and a higher 

bit rate for live viewing on web browsers. Note that a larger frame size takes up more bandwidth.

■ Maximum frame rate

This limits the maximum refresh frame rate per second. Set the frame rate higher for smoother video 

quality.

The frame rates are selectable at 1fps, 2fps, 3fps, 5fps, 8fps, 10fps, and 15fps. You can also select 

Customize and manually enter a value. The frame rate will decrease if you select a higher resolution.

■ Video quality

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.

► Video quality and fixed quality refers to the 

compression rate. If you select to enter a Customized value 

in the Fixed quality menu, a lower value will produce higher quality.

► Converting high-quality video may significantly increase the CPU loading, and you may encounter 

streaming disconnection or video loss while capturing a complicated scene. In the event of occurance, 

we suggest you customize a lower video resolution or reduce the frame rate to obtain smooth video.