Abus DIGI-LAN TV7210 Installation Instructions Manual

Contents

Abus DIGI-LAN TV7210 Installation Instructions Manual Manual pdf 84 page image

21Administrator settingsConfiguration / videoBest performance is produced by the maximum frame rate with best video quality and minimum networkbandwidth. The six factors “Size”, “Maximum frame rate”, “Video codec type”, “Key frame interval”,“Fix bit rate” and “Fix quality” on the video configuration page are correlative to allow for achieving thebest performance that is possible.For high frame ratesTo obtain a good visual realtime effect (more than 20 frames/s), the network bandwidth must be sufficientlylarge. If the network bandwidth is higher than 1 Mbps, the value for the “Fix bit rate” must be set to1000Kbps or 1200Kbps and the “Fix quality” to the highest quality. In the PAL system, the maximum framerate is 25, and in the NTSC system, 30 frames per second. If your network bandwidth is more than 384Kbps,you can fix the bit rate according to your bandwidth and the maximum frame rate to 25 or 30 fps (frames persecond). If the pictures in your environment are changed drastically, you can reduce the maximum framerate to 20 frames per second to set the data transmission rate lower. This gives you a better video quality,and the human eye cannot distinguish between 20, 25 and 30 frames per second. If the network bandwidthis less than 384 Kbps, adjust the “Fix bit rate” according to the bandwidth and try to get the bestperformance by fine-tuning the “Maximum frame rate”. In a “slow” network, a high frame rate results inunclear, distorted images. Another way to improve quality is to select “Half” in the “Size” option, or “Half x2” for a larger view of the pictures. Video quality also depends on the number of users in the network.Performance can also be affected by a bad connection and by a restriction of the network burst.In multi-user environment, the user who has poor network performance will receive only the key frame inMPEG4 format. Try to reduce the key frame interval can improve the frame rate for poor networkperformance, but the penalty is the increasing of network traffic. If the server is running on the Internet,select “Improve efficiency in the multi-user environment” will improve the efficiency in the multi-userenvironment.