Dahua HDCVI series, User Manual

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Code stream
type It includes main stream, motion stream and alarm stream. You
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.
Smart Codec
Select Start from the dropdown list to enable smart codec
function. The DVR can auto reduce the video bit stream of the
non-important surveillance object to save the storage space.
Compression
Compression: System supports H.264H, H.264, H.264B, and
MJPEG.

H.264H: It is the High Profile compression algorithm. It has
the high encode compression rate. It can achieve high
quality encode at low bit stream. Usually we recommend
this type.

H.264 is the general compression algorithm.

H.264B is the Baseline algorithm. Its compression rate is
low. For the same video quality, it has high bit stream
requirements.
Resolution
For analog channel, system supports various resolutions, you
can select from the dropdown list. Please note the option may
vary due to different series. For digital channel, the resolution
here refers to the capability of the network camera.
Frame Rate
PAL
：
1
～
25f/s
；
NTSC
：
1
～
30f/s.
Bit Rate

Main stream: You can set bit rate here to change video
quality. The large the bit rate is , the better the quality is.
Please refer to recommend bit rate for the detailed
information.

Extra stream: In CBR, the bit rate here is the max value.
In dynamic video, system needs to low frame rate or
video quality to guarantee the value. The value is null in
VBR mode.
Reference bit
rate Recommended bit rate value according to the resolution and
frame rate you have set.
I Frame Here you can set the P frame amount between two I frames. The
value ranges from 1 to 150. Default value is 50.
Recommended value is frame rate *2.
Audio source
Please select from the dropdown list. There are two options:
Normal/HDCVI. In the normal mode, the audio signal comes
from the Audio In. In the HDCVI mode, the audio signal comes
from the coaxial cable of the camera.