ATV NV237, Руководство пользователя

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704x576, 704x480, 640x480, 640x360 and 320x240. Users can change the se-
lected screen size anytime while monitoring the screen on a real-time basis.
– 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 except the largest resolution,
2048x1536.
– 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 3,4 Setting: Same as the Stream 1 Setting, except for the resolution and
bitrate which are confined by 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.