User guide

8: LDVR-3U Overview
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differencing under control. The intra frame rate is automatically determined by
the recorded frame rate.
The quality of recorded video is determined by the combination of the configured
compression level, configured frame rate, and amount of motion.
Video compression is software configurable through the System Administration
Application. The compression level ranges from 0 to 100%. The suggested
compression value is 75% for the DV-4UP-30F, and 50% for the DV-8UP-S.
Note: Reducing compression provides better image quality; however, it will result
in fewer days of storage and will increase bandwidth requirements for video
windows and archiving.
LDVR-3U Frame Rates
8-channel digital video capture board configurations
The standard 8-channel digital video boards can be configured to operate at 30
fps NTSC (25 fps PAL) per board.
The 8-channel digital video capture board multiplexes 30 fps across all
configured channels. If only one or two cameras are configured on the board, it
may record up to 15 fps (NTSC). As the number of cameras increases, the frame
rate decreases because the total frame rate for each board is distributed among all
the cameras connected to it.
Frame rates for each camera are software-configurable. If there is no setting
specified, by default the frame rate for NTSC cameras is 3.75 fps and the frame
rate for PAL cameras is 3.1 fps. You may choose one of five different frame rate
settings.
Frame rates available for NTSC video standard: 15.0, 7.5, 3.7, 1.8, and 0.9.
Frame rates available for PAL video standard: 12.5, 6.2, 3.1, 1.5, and 0.7.
Number of
cameras
NTSC maximum (per camera, per
8-channel digital video board)
PAL maximum (per camera, per 8-
channel digital video board)
1 15 frames per second 12.5 frames per second
2 15 frames per second 12.5 frames per second
3 7.5 frames per second 6.25 frames per second
4 7.5 frames per second 6.25 frames per second
Greater than 4 3.75 frames per second ~3.125 frames per second