Vivotek IP7138 Bedienungsanleitung PDF herunterladen (Seite 22)

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, or

set “Fix quality” at the highest quality. 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.

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 or HTTP protocol in

“MPEG-4 Protocol Options” 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.

21 - User's Manual

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Vivotek IP7138 Bedienungsanleitung Seite 22