User guide

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* H.264 BP (Base Profile):
Originally intended as the mainstream consumer profile for broadcast and storage
applications, the importance of this profile faded when the High profile was developed for
those applications.
* MPEG4 SP (Simple Profile):
This profile is mostly aimed for use in situations where low bit rate and low resolution are
mandated by other conditions of the applications, like network bandwidth, device size, etc.
- Resolution:
Resolution enables users to determine a basic screen size when having access through the
Web Browser or PC program. The screen size control provides several modes, such as
1600x1200, 1280x1024, 1280x720, 704x480 (576), 640x480, 352x240 (288), and 320x240.
Users can reset the selected 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 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 the setting a fixed target bitrate that consumes a predictable amount of
bandwidth. The bit rate would usually need to increase for increased image activity, but in
this case it cannot; therefore, 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.
Bitrate:
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.
Alternatively, when it is necessary to maintain a detailed monitoring screen by enhancing the
image quality, users can do so by decreasing the compressibility. In each case, 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; 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 t general monitoring, do not change a basic
value; such act may cause a problem to the system performance. Vicon recommends that
GOP be the same as the fps.