DF3000IP(-DN) / DF3000IP(-DN) CasinoCam
®
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Dallmeier electronic
Resolution
The resolution enables you to influence the size of the images for the video signal. The
entries define width x height in pixels.
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 Mbit/s (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.
NOTE
Audio encoding is only available with a bit rate of 8 Mbit/s or
less.
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 Mbit/s and a bit rate mode „variable by 50%“, the bit rate can
vary from 6 Mbit/s to 2 Mbit/s during encoding.
In variable bit rate mode, settings are made in 10% increments, from 10% to 400%.
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 Pictures) 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).
GOP sizes greater than 15 belong to the Extended GOPs.
NOTE
Reverse playback has limited quality (frame drops) with
extended GOPs (> 15).
