Vivotek PT7137 User Manual download pdf (Page 23)

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User's Manual - 23

For Best Real-time Video Images

To achieve good real-time visual effect, the network bandwidth should be large enough

to allow a transmission rate of greater than 20 image frames per second. If the

broadband network is over 1 Mbps, set the “Fix bit rate” to 1000Kbps or 1200Kbps. The

maximum frame rate is 30. If your network bandwidth is more than 512Kbps, you can

fix the bit rate according to your bandwidth and set the maximum frame rate to 30 fps.

If the images vary dramatically in your environment, you may want to slow the

maximum frame rate down to 20 fps in order to lower the rate of data transmission.

This allows for better video quality and the human eyes cannot readily detect the

differences between those of 20, 25, or 30 frames per second. If your network

bandwidth is below 512 Kbps, set the “Fix bit rate” according to your bandwidth and try

to get the best performance by fine-tuning with the “Maximum frame rate”. In a slow

network, greater frame rate results in blur images. Another work-around is to choose

“160x120” in the “Size” option for better images. Video quality performance will vary

somewhat due to the number of users viewing on the network; even when the

parameters have initially been finely tuned. Performance will also suffer due to poor

connectivity because of the network’s burst constraint.

Only Quality Images Will Do

To have the best video quality, you should set “Fix quality” at “Detailed” or “Excellent”

and adjust the “Maximum frame rate” to match your network’s bandwidth. If your

network is slow and you receive “broken” pictures, go to the TCP protocol in

“Connection type” and choose a more appropriate mode of transmission. The images

may suffer a time delay due to a slower connection. The delay will also increase with

added number of users.

Somewhere Between Real-time and Clear Images

If you have a broadband network, set “Fix quality” at ”Normal” or better, rather than

setting “Fix bit rate”. You can also fix the bandwidth according to your actual network

speed and adjust the frame rate. Start from 30 fps down for best results but not below

15 fps. If the image qualities are not improved, select a lower bandwidth setting.

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Vivotek PT7137 User Manual Page 23