15
AXIS Q6034-E - Video
H.264
GOV Settings
The GOV structure describes the composition of the video stream and setting the GOV-length to a higher value saves
considerably on bandwidth but may have an adverse effect on image quality.
Bit Rate Control
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 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. Not setting a
priority means the frame rate and image quality are equally affected.
Note:
To determine a reasonable bit rate, go to
Setup > Video > Video Stream > Image
. Under Overlay Settings, check the
Include
checkbox and enter the code
#b
in the
Include text
: field. The current bit rate will display as a text overlay on
the Live View page.
To preview the image stream while configuring the GOV settings and Bit rate control, select
Open
under
Preview.
MJPEG
Sometimes the image size is large due to low light or complex scenery. Adjusting the
Maximum frame size
helps control the
bandwidth and storage used by the Motion JPEG video stream in these situations. Defining the frame size as
Default
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 may give poor image quality. To prevent increased bandwidth and storage
usage, the maximum frame size should be set to an optimal value.
