Digital Watchdog MEGApix DWC-MPTZ30X, Руководство пользователя, Страница: 27 / 96

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– Bitrate control: The bit rate can be set as Variable Bit Rate (VBR) or Constrained Variable Bit Rate
(CVBR). 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. Limiting the
maximum bit rate helps control the bandwidth used by the H.264 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 degraded when the limit is exceeded.
* VBR: unlimited maximum bitrate.
* CVBR: VBR with maximum bitrate which is set in Bitrate.
– Bitrate: Maximum bitrate for CVBR in the range of 100Kbps ~ 8Mbps. This is disabled if Bitrate
control is set to VBR.
– 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.
• Stream 2 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.
– MJPEG Resolution: Same as the stream 1 settings.
– MJPEG Frame rate: Same as the stream 1 settings.
– MJPEG 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.
• Stream 3 Setting: Same as the Stream 1 Setting.
When the settings are complete, click Save button to save the settings, or click Reset button to clear all of
the information you entered without saving it.