Quaddrix QT-500-16, Руководство пользователя

Страница: 71 / 128

option to record only video. For QT-500-8 DVR, there is only one “Video”
option.
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.
QT-500-4 and QT-500-8 support QCIF and CIF. 100FPS (PAL) or 120FPS
(NTSC), QT-500-16 support QCIF and CIF.
First 8-ch has 100FPS and
second 8-ch has 100FPS (PAL) or first 8-ch has 120FPS and
second 8-ch has 120FPS (NTSC)
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
image. 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 1Mbps-1.5Mbps.
Of course, you will select the proper max bit rate based on the camera,
background and image quality requirement.