User`s manual

VPort 25 User’s Manual System Configuration
4-28
NOTE
Frame rate (frames per second) is determined by the resolution, image data size (bit rate), and
transmission traffic status. The Administrator and users can check the frame rate status in the
FPS Status on VPort’s web homepage.
NOTE
A large “Key frame interval” can reduce the bit rate, but will cause the image to be corrupted
longer if there is packet loss during transmission.
Video Quality Control
Video Quality Control is used to optimize the bandwidth of the video stream. There are 2 modes
for video quality control.
Setting Description Default
Fixed bit rate
(Only for MPEG4)
The administrator can fix the bandwidth
to tune the video quality and FPS (frames
per second) to the optimum combination.
You may choose from the following
bandwidths: 600 Kbps, 1200 Kbps, 1800
Kbps, 2400 Kbps, 3000 Kbps, 3600
Kbps, 4200 Kbps, 4800 Kbps, and 5400
Kbps to let the VPort determine the
quality and frame rate by itself. The
combination of image quality and FPS is
determined by the bandwidth.
Fixed bit rate of 600 Kbps
Fixed Quality
The administrator can set the image
quality to one of 5 standards: Medium,
Standard, Good, Detailed, or Excellent.
The VPort will tune the bandwidth and
FPS automatically to the optimum
combination.
Good
NOTE
The image quality, FPS, and bandwidth are influenced significantly by network throughput,
system network bandwidth management, applications the VPort runs (such as VMD), how
complicated the image is, and the performance of your PC or notebook when displaying images.
The administrator should take into consideration all of these variations when designing the video
over IP system, and when specifying the requirements for the video system.