User`s manual

AXIS 216FD/FD-V/MFD/MFD-V - Configuration - Video & Image settings

To instead prioritize frame rate, choose Prioritize frame rate from the Exposure priority

drop-down box and reduce the Max exposure time. The image darkens considerably, but

the frame rate is maintained. To increase image brightness increase Max gain, but this

increases image noise.

Please refer to the online help for more information .

MPEG-4

GOV Settings

The GOV structure describes the composition

of the MPEG-4 video stream. Setting the

GOV-length to a high value saves on bandwidth. The Cyclic refresh parameter gives a

smoother bit rate and can be useful if bandwidth is limited.

Bit Rate Control

Limiting the maximum bit rate helps control the bandwidth used

by the MPEG-4 video

stream. Leaving the Maximum bit rate as unlimited maintains 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 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 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 bit

rate 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 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.

MJPEG

Sometimes the image size is large due to low light or complex scenery. Adjusting the

maximum frame size helps to control the bandwidth and storage used by the MJPEG video

stream in these situations. Defining the frame size as Unlimited provides consistently good

image quality at the expense of increased bandwidth and storage usage during low light.

Limiting the frame size optimizes bandwidth and storage usage, but gives poor image

quality. To prevent increased bandwidth and storage usage, the maximum frame size

should be set to an optimal value.