- Profile:
There are 4 pre-programmed stream profiles available for quick set-up. Choose the form of
video encoding from the Codec drop-down list:
* H.264 HP (High Profile):
The primary profile for broadcast and disc storage applications, particularly for high-
definition television applications (for example, this is the profile adopted by the HD DVD and
Blu-Ray Disc).
* H.264 MP (Main Profile):
Primarily for low-cost applications that require additional error robustness, this profile is used
rarely in video-conferencing and mobile applications; it does add additional error resilience
tools to the Constrained Baseline Profile. The importance of this profile is fading after the
Constrained Baseline Profile has been defined.
* 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, 800x600, 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 and Bitrate control:
Limiting the bit rate helps control the bandwidth used by the H.264 or MPEG-4 video stream.
Leaving the maximum bit rate as 8000 Kbps 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 only be used for constant bit rate.
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.
- 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.
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