User guide

SerVision MVG 400 System Guide
Configuring the MVG 400 113
When advanced settings are activated, you can choose to record larger VGA frames, or
smaller, QSIF frames, and you can select custom quality settings. Quality is defined by a
bitrate/framerate pair. The following table summarizes the recommended settings and the
approximate disk usage at each setting:
Window
Resolution
High
Quality
Medium
Quality
Low
Quality
QSIF
(small frame)
10 fps
32 kbps
320 MB/day
6 fps
16 kbps
160 MB/day
4 fps
8 kbps
80 MB/day
SIF
(medium-sized frame)
10 fps
128 kbps
1.4 GB/day
7 fps
48 kbps
480 MB/day
4 fps
24 kbps
240 MB/day
VGA
(large frame)
7 fps
256 kbps
2.65 GB/day
5 fps
128 kbps
133 GB/day
4 fps
64 kbps
670 MB/day
Table 1: Recommended video quality settings
NOTE: Bitrate is defined in kilobits per second (kbps), and framerate is defined in frames
per second (fps).
NOTE: At times, real-time demands on system resources may make it temporarily
impossible for the system to adhere to the specified quality settings. In this case,
the system automatically regulates itself to ensure the best use of available
resources. When necessary, it may temporarily lower the framerate of a stream
slightly in order to accommodate all of its immediate processing requirements. The
quality of individual frames in the stream is not reduced.
NOTE: VGA recording introduces extra load on the unit. Therefore, VGA recording
should be used sparingly.
By default, the recorders are allocated equal shares of the available disk space. If you wish,
you can allocate the disk space differently. For example, if three recorders are event triggered,
and the other records continuously, you may wish to allocate 20% of the disk space to the
event-triggered recorders, and 75% to the continuous recorder. (It is recommended to leave
approximately 5% of the disk space free for management overhead.) This allocation would
maximize the recording time available for continuous recording without significantly limiting
the disk space available for the recording of events.