User Manual
DW Spectrum 3.0
Rev. 072017 Page | 69
Adjusting Average Bitrate on Device
When the software tries to configure target bitrate on some camera models it can be set up incorrectly. This may
result in poor image quality.
To workaround this issue it is possible to adjust Average Bitrate on Device:
1. Open Camera Settings and go to Expert.
2. Check I have read the manual and understand the risks.
3. Choose Calculate Bitrate per GOP instead of bitrate per second.
4. Restart the camera.
IMPORTANT. If this option is set by mistake, this will significantly increase bitrate! Use it only if the picture quality
is noticeably poor.
This setting is ignored if DW Spectrum is configured to not change Camera Streaming Settings.
Disabling Recording of Primary/Secondary Stream
For some reasons it may be necessary to disable recording of primary or secondary streams. For instance:
Primary – to save space. Instead it is recommended to set "Motion + LQ" recording type
Secondary – if secondary stream's bitrate is too high. In this case DW Spectrum server will still do software motion
detection (by decoding a secondary stream for this purpose), but won't record it.
To disable recording of primary or secondary streams
1. Open Camera Settings and go to Expert.
2. Check I have read the manual and understand the risks.
3. Tick Do not archive primary stream or Do not archive primary stream.
Adjusting Secondary Stream Quality
DW Spectrum's architecture provides significant CPU and network bandwidth savings by acquiring multiple streams
from a single camera: High Resolution (regular) and Low Resolution (approximately x10 less bandwidth). The second
stream is always decoded by Server and is used for the following:
Software Motion Detection
CPU and Bandwidth Saving during Playback (RADASS)
The quality of the second stream is set automatically, however, it is possible for User to adjust the quality of the
stream.
IMPORTANT. Higher quality of the second stream provides for a much better look and feel (especially on larger
monitors), but can significantly increase CPU load on Server . It is not recommended to change these settings.
To adjust the quality of the second stream:
1. Open Camera Settings and go to Expert.
2. Check I have read the manual and understand the risks.