Vivotek PT3122 - Manual (Page 21)

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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.
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.
Viewing Double size image
The Network Camera not only provide standard CIF/SIF format video, but also
provide 4CIF/4SIF format video. For selecting “Double” video size, the video from
the Network Camera can provide more details, but less frame-rate (up to 10