IC Realtime Flex Series: 8-CH High Performance H.264E 2U DVR with DVD-RW - Manual (Page 127)

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Figure 7-19
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
960H/D1/HD1/2CIF/CIF/QCIF and the extra stream supports
960H/D1/HD1/2CIF/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.