IC Realtime Max Series: 4/8/16 Channel D1 1.5U Standalone DVR - Manual (Page 129)

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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
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 z 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.
z 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.
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 7-20.
Figure 7-20
Please refer to the following sheet for detailed information.
Parameter Function
Snapshot type
There are two modes: Timing (schedule) and Event
(activation).
z
Timing snapshot is valid during the specified period you
set.
z Activation snapshot only is valid when motion detect alarm,