Vivotek PZ7121 User Manual download pdf (Page 50)

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50 - User's Manual

■ Maximum frame rate

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

quality� The frame rates are selectable at the following rates: 1fps, 2fps, 3fps, 5fps, 8fps, 10fps, 15fps,

20fps and 25fps, and 30fps�

■ Intra frame period

Determine how often to plant an I frame� The shorter the duration, the more likely you will get a better

video quality, but at the cost of higher network bandwidth consumption� Select the intra frame period

from the following duration: 1/4 second, 1/2 second, 1 second, 2 seconds, 3 seconds and 4 seconds�

■ Video quality

A complex scene generally produces 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 performances� The bit rates are selectable at the

following rates: 20Kbps, 30Kbps, 40Kbps, 50Kbps, 64Kbps, 128Kbps, 256Kbps, 512Kbps, 768Kbps,

1Mbps, 2Mbps, 3Mbps and 4Mbps�

On the other hand, if Fixed quality is selected, all frames are transmitted with the same quality;

bandwidth utilization is therefore unpredictable� The video qualities are selectable at the following

settings: Medium, Standard, Good, Detailed and Excellent�

If JPEG mode is selected, the Network Camera continuously sends JPEG images to the clients,

producing dynamic effects similar to movies� Every single JPEG image transmitted guarantees the same

image quality, which in turn comes at the expense of variable bandwidth usage� And because the media

contents are a combination of JPEG images, no audio data is transmitted to the clients�

There are three dependent parameters provided in MPEG-4 mode for video performance adjustment:

■ Frame size

Select the video size� Note that a larger frame size requires more bandwidth� The frame sizes are

selectable in the following resolutions:

NTSC PAL

704 x 480 704 x 576

CIF 352 x 240 352 x 288

QCIF 176 x 120 176 x 144

■ Maximum frame rate

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

quality� The frame rates are selectable at the following rates: 1fps, 2fps, 3fps, 5fps, 8fps, 10fps, 15fps,

20fps and 25fps, and 30fps�

■ Video quality

The video qualities are selectable at the following settings: Medium, Standard, Good, Detailed and

Excellent�

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Vivotek PZ7121 User Manual Page 50