Vivotek PZ6112 Installation Guide download pdf (Page 24)

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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 25 fps in a 50Hz

system and 30 fps in a 60Hz system. If your network bandwidth is more than 384Kbps,

you can fix the bit rate according to your bandwidth and set the maximum frame rate

to 25 fps or 30 fps. If you are shooting fast-moving images, 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 384 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

“Half” in the “Size” option for better images, or “Halfx2” for a larger image view. 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.

In multi-user environment, the user who has poor network performance will receive

only the key frame in MPEG4 format. Try to reduce the key frame interval can improve

the frame rate for poor network performance, but the penalty is the increasing of

network traffic. If the server is running on the Internet, select the “improve efficiency

in the multi-user environment” will improve the efficiency in the multi-user

environment.

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 HTTP protocol in

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

may suffer a time delay due to a slower connection.

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Vivotek PZ6112 Installation Guide Page 24