User Manual of DS-8000HMFI Mobile DVR
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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.
Note: If you change this option, please reboot DVR to make parameter into effective.
Resolution: The higher resolution is, the clearer the image is. The resolution options from
low to high are: QCIF, CIF, 2CIF, DCIF, 4CIF.
Note: If you change this resolution option, please reboot DVR to make it into effective.
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 resolution, the typical bit rate is 512K-1Mbps. For 4CIF resolution, the typical bit rate is
1.25Mbps-1.75Mbps. 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”.
Image Quality: If you select variable bit rate type, you can define image quality. There are
6 options: Highest, Higher, High, Average, Low and Lowest. High image quality needs high bit
rate size.
Frame Rate: Frame per second. Options are: Full (PAL is 25 FPS and NTSC is 30FPS),
20, 16, 12, 10, 8, 6, 4, 2, 1, 1/2, 1/4, 1/8, 1/16. For low frame rate, you can select low bit rate
size.
PreRecord Time: When you enable motion detection recording or external alarm
recording, you can define prerecord time. The options are: No PreRecord, 5 Seconds (default
selection), 10 Seconds, 15 Seconds, 20 Seconds, 25 Seconds, 30 Seconds and Max
PreRecord.
MaxPreRecord is to save all data in PreRecord buffer. The PreRecord time is related with