For Best Real-time Video Images

Introduction

Installation

Administrator's features (Cont.)

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 512 Kbps, 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.

How to Use

Deﬁnitions in Conﬁguration

Appendix

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