Vivotek VS3100P Specifications download pdf (Page 57)

VIVOTEK

User's Manual - 57

■ 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. The

frame sizes are selectable in the following resolutions: QCIF, CIF, 4CIF, and D1.

■ Maximum frame rate

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

quality�

If the power line frequency is set to 50Hz, the frame rates are selectable at 1fps, 2fps, 3fps, 5fps,

8fps, 10fps, 15fps, 20fps, and 25fps. If the power line frequency is set to 60Hz, the frame rates are

selectable at 1fps, 2fps, 3fps, 5fps, 8fps, 10fps, 15fps, 20fps, 25fps, and 30fps� You can also select

Customize and manually enter a value� 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

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

for data transmission� Therefore, if Constant bit rate is selected, the bandwidth utilization is xed 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, and 4Mbps� 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 JPEG mode is selected, the video server 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: