Vivotek FD7131 User Manual download pdf (Page 25)

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be supported for cell phone viewing. Please set related video settings first as

mentioned when viewing by mobile phone.

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 “Constant bit rate” to 1000Kbps or

1200Kbps, or set “Fixed quality” at the highest quality. The maximum frame rate is 30.

If your network bandwidth is more than 512Kbps, you can adjust 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 “Constant 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 “Fixed 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 “Fixed quality” at “Good” or better, rather than

setting “Constant 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

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Vivotek FD7131 User Manual Page 25