IC Realtime 4/8 All Channel 720P Mini 1U HD-AVS DVR - Manual (Page 112)

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Please refer to the following sheet for detailed information.
Parameter Function
Channel Please select a channel from the dropdown list.
Video enable Check the box here to enable extra stream video. This item is
enabled by default.
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.
Compression The main bit stream supports H.264. The extra stream supports
H.264, MJPG.
Resolution System supports various resolutions, you can select from the
dropdown list. The main stream supports
720P/960H/D1/HD1/2CIF/CIF/QCIF and the extra stream
supports CIF/QCIF. Please note the option may vary due to
different series.
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/HD-AVS.In the normal mode, the audio signal comes
from the Audio In. In the HD-AVS mode, the audio signal comes
from the coaxial cable of the camera.
Watermark
enable
This function allows you to verify the video is tampered or not.
Here you can select watermark bit stream, watermark mode
and watermark character. Default character is DigitalCCTV. The
max length is 85-digit. The character can only include number,
character and underline.
7.8.1.2.2 Snapshot
The snapshot interface is shown as in Figure 7-18.