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DIS-1/S
35
Dallmeier electronic
Meaning of the individual settings options
Input
Here you can select which encoder you would like to use for digitalization. Encoder 1 is the
default setting for the DIS and can not be changed.
Bitrate
The bit rate is a measure of the degree of compression of video data. It thus has a direct
impact on the image quality of the recording. A low bit rate stands for a high degree of
compression with a relatively small volume of data but poor image quality.
A high bit rate stands for a low degree of compression with a relatively large volume of data
and very good image quality. A bit rate of between 4 and 6 Mbps (megabit per second) is a
good compromise between data volume and image quality. Most requirements in surveillance
systems are met with the quality of image thus obtained.
Frames/Second
The image rate is set by default for a real-time recording with 25 images per second (or 30
per second for NTSC) and cannot be changed.
In special cases it is possible to order a software update that can be used to set lower image
rates.
NOTE
Please note that an audio recording (the setting for which is
configured in the Audiobitrate field) is only possible at a video
rate of 25 images per second (or 30 per seconds for NTSC).
Bitrate mode
The bit rate mode allows you to configure video recording to occur at a constant or a
variable bit rate. A variable bit rate makes better use of the available hard disk space.
The variable setting changes the bit rate in accordance with the activity (changes) in the
image. You can limit the fluctuation of the bit rate by making the appropriate setting, which
is done as a percent.
Example to bit rate mode
With a set bit rate of 4 Mbits and a bit rate mode „variable by 50 %“, the bit rate can
vary from 6 Mbits to 2 Mbits during recording.
In variable bit rate mode, settings are made in 10 % increments, from 10 % to 400 %.
IMPORTANT
When the bitrate is changed, all images recorded up to this
point are erased.
Audiobitrate
The audio bit rate setting allows you not only to control the audio quality, but also the
amount of required hard disk space to a certain extent. The higher the audio bit rate the
better the audio quality. A higher bit rate, however, requires more hard disk space than a
lower bit rate.
GOP-size
GOP (Group Of Images) is a variable for specifying how images are used to generate the
MPEG-2 data flow. A GOP value of 6 and 15 enables good image quality with high
compression. A GOP value of 1 denotes a low compression factor and should only be used
for special applications (e.g. multiplex mode).