User Manual for COLOSSUS Series Embedded Net DVR
LJD Digital Security Ltd
Page
70
of
107
Copyright © 2005. All rights reserved.
Stream Type:
There are two options, one is “Audio&Video” stream and the other is “Video”
stream only. If you want to record video and audio, please select “Audio&Video” option,
otherwise you can select “Video” option to record only video. For COLOSSUS DVR, there is only
one “Video” option.
Note: If you change this option, please reboot DVR to make parameter into effective.
Resolution:
2CIF PAL is 704*288 and NTSC is 704*240.
Bit Rate Type:
There are two options: “Variable” and “Fixed”.
If you select variable bit rate, DVR will adjust the actual bit rate according to the video
movement. When there is not much movement, DVR will use low bit rate, while there is much
movement, DVR will use high bit rate. In this case, DVR can save HDD usage and network
bandwidth.
If you select fixed bit rate, DVR will use the fixed bit rate to compress iamge. The bit rate
size is defined in “Max Bit Rate” option. In this case, we can calculate the recorded file size and
network bandwidth that we need.
Max Bit Rate:
If you select variable bit rate, when the video input has great movement, we
need to limit the max bit rate. The max bit rate has following options (bps): 32K, 48K, 64K, 80K,
96K, 128K, 160K, 192K, 224K, 256K, 320K, 384K, 448K, 512K, 640K, 768K, 896K, 1M, 1.25M,
1.5M, 1.75M, 2M and “User define”.
The max bit rate selection has relations with resolution. If you select high resolution, you
must select high bit rate. For CIF resolution, the typical max bit rate is 384K-768Kbps. For
DCIF/2CIF resolution, the typical bit rate are 512K-1Mbps. For 4CIF resolution, the typical bit
rate are 768K-2Mbps. Of course, you will select the proper max bit rate based on the camera,
background and image quality requirement.
Bit rate:
You can select bit rate size for fixed bit rate type. It is the same as “Max Bit Rate”.
