Dahua XVR User Manual page 199

Please refer to the following sheet for detailed information.
Parameter Function
Channel Please select a channel from the dropdown list.
SVC is so called scaled video coding. Check the box to enable
SVC
this function. During the network transmission process, system
discards unimportant frames when the bandwidth is not
sufficient or the decode capability is low. It is to guarantee video
quality and transmission fluency.
Check the box here to enable extra stream video. This item is
Video enable
enabled by default.
Code stream It includes main stream, motion stream and alarm stream. You
type can select different encode frame rates form different recorded
events.
System supports active control frame function (ACF). It allows
you to record in different frame rates.
For example, you can use high frame rate to record important
events, record scheduled event in lower frame rate and it allows
you to set different frame rates for motion detection record and
alarm record.
Select Start from the dropdown list to enable smart codec
Smart Codec
function. The DVR can auto reduce the video bit stream of the
Figure 4-23
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