User manual

resilience tools to the Constrained Baseline Profile. The importance of this profile is
fading after the Constrained Baseline Profile has been def ined.
* 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) 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.
* MPEG4 ASP(Advanced Simple Profile)'s notable technical features relative to the Simple
Profile, which is roughly similar to H.263, including "MPEG"-style quantization,
interlaced video, B pictures (also known as B Frames), Quarter Pixel motion
compensation (Qpel), Global motion compensation (GMC).
-. Resolution
It enables users to determine a basic screen size when having an access through the Web
Browser or PC program. The screen size control comes in seven modes like
4CIF(704x480(576)), 2CIF(704x240(288)), CIF (352x240(288)), QCIF(176x120(144)),
VGA(640x480), QVGA(320x240), and QQVGA(160x120). Users can reset the selected
screen size anytime while monitoring the screen on a real-time basis.
-. Bit-rate 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 consta nt 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 negative ly. 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.