Axis 213 PTZ User Manual page 18

AXIS 213 PTZ
18
Bit Rate Control
Limiting the maximum bit rate is a good way of controlling the bandwidth used by the MPEG-4 video
stream. Leaving the Maximum bit rate as unlimited provides consistently good image quality, but at the
expense of increased bandwith usage whenever 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 a maximum bit rate can be used for both variable and constant bit rates.
The bit rate type can be set as Variable Bit Rate (VBR) or Constant Bit Rate (CBR). VBR adjusts the bit rate
according to the images' complexity, thus using a lot of bandwidth for a lot of activity in the image and less
for lower activity in the monitored area.