Revo REHVDPTZ22-1 INSTRUCTION MANUAL - Manual (Page 43)

- Bitrate control: Limiting the maximum bit rate helps control the bandwidth used by the
H.264 or MPEG-4 video stream. Leaving the Maximum bit rate as unlimited maintains
consistently good image quality but increases bandwidth usage when there is more
activity in the image. Limiting the bit rate to a defined value prevents excessive
bandwidth usage, but images are lost when the limit is exceeded.
Note that the maximum bit rate can be used for both variable and constant bit rates.
The bit rate can be set as Variable Bit Rate (VBR) or Constant Bit Rate (CBR). VBR
adjusts the bit rate according to the image complexity, using up bandwidth for increased
activity in the image, and less for lower activity in the monitored area.
CBR allows you to set a fixed target bitrate that consumes a predictable amount of
bandwidth. As the bit rate would usually need to increase for increased image activity,
but in this case cannot, the frame rate and image quality are affected negatively. To
partly compensate for this, it is possible to prioritize either the frame rate or the image
quality whenever the bit rate needs to be increased. Not setting a priority means the
frame rate and image quality are equally affected.
- Compression: When it is necessary to adjust a smooth transmission status according to
network situations, users can increase the compressibility to carry out the network
transmission stably. On the other hand, when it is necessary to maintain a detailed
monitoring screen by enhancing the image quality, users can do so by decreasing the
compressibility. In ease case, please adjust this function according to the network status
and monitoring purposes. The default is 2000(Kbps).
- Frame rate: Upon the real-time play, users should select a frame refresh rate per second.
If the rate is high, the image will become smooth. On the other hand, if the rate is low,
the image will not be natural but it can reduce a network load.
- GOP size: Select the GOP(Group of Picture) size. If users want to have a high quality of
fast image one by one, please decrease the value. For the purpose of general
monitoring, please do not change a basic value. Such act may cause a problem to the
system performance. For the details of GOP setting, please contact the service center.
• Image Setting: Sometimes the image size is large due to low light or complex scenery.
Adjusting the frame rate and quality helps to control the bandwidth and storage used by
the Motion JPEG video stream in these situations. Limiting the frame rate and quality
optimizes bandwidth and storage usage, but may give poor image quality. To prevent
increased bandwidth and storage usage, the Resolution, Frame rate, and Frame Quality
should be set to an optimal value.
- JPEG resolution: Same as the video settings.
- JPEG frame rate: Same as the video settings.
- JPEG quality: Select the picture quality. If users want to have a high quality of fast
image one by one, please decrease the value. For the purpose of general monitoring,
please do not change a basic value. Such act may cause a problem to the system
performance.
When satisfied with the settings, click Save, or click Reset to revert to previously saved
settings.
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