
Software User’s Manual Ver.A1D-502-V8.03.30-NB
67
Parameters
Description
Video Bit Rate
(available only in
CBR mode.)
Under CBR mode, when Video Max Bit Rate is chosen
“
Unlimited
”
,
the user can define the AVERAGE bit rate. For example, if the Video
Bit Rate is chosen 2M, then occasionally, the actual bit rate may go
below or beyond 2M, but in the long run, the average bit rate will be
very close to 2M. This mode allows the most accurate storage
estimations, however, while planning the bandwidth, please consider
the occasional peaks of bit rate.
Quality
(available only in
VBR mode.)
H.264 Compression:
Under VBR mode, the bit rate will be
floating while the video quality will be
stable and follows the quality
standard set by the user. The user can
choose either
“
High
”
,
“
Medium
”
or
“
Low
”
quality. The higher is the
quality level, the more bit rate the camera will use to achieve the
target quality.
MJPEG Compression:
The user can define the quality with the numeric scale from 1 to 100.
The default MJPEG quality is 60. The higher is the quality level, the
more bit rate the camera will use to achieve the target quality.
GOP 1 I-frame
(available only if the
Encoder type is
H.264. and in VBR
mode)
Under VBR mode it is possible to adjust the GOP length - that is the
occurrence rate of I-frames. By default, there is one I-frame per
second. For example, in case of 30fps, there will be 1 I-frame and
29 P-frames every second by default. When the GOP is changed to
“
1 I-frame per 5 seconds
”
, then there will be one I-frame, followed
by 149 P-frames. In case of the static scenes, long GOP can further
minimize the bandwidth and storage consumption.
Adaptive Stream
Dynamic GOP: If there is too much motion on the scene, the
firmware shortens the GOP length to provide more detail in the
video. Note that dynamic GOP may be incompatible when used
with video decoders.
Dynamic ROI: Normally, bitrate is higher when viewing motion
scenes including the regions without motion; therefore the
overall bitrate is high. For Dynamic ROI, the bitrate motion
areas are increased but decreased for non-motion regions.
After changing any of the items above, scroll down the screen and press Apply to save
the changes. The Reset button undoes the changes that had just been made but not
applied yet.