Manual

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Firmware User’s Manual V7.00.44
65
same video quality, you can select a higher bit rate with lower
compression; this is the same as having a lower bit rate with a High
Profile. For example, a video on High Profile with 2M bit rate will have
the same video quality as a video with Baseline Profile at 3.5M bit
rate.
VGA Aspect Ratio
It is used to define the aspect ratio of VGA stream – it can be either
4:3 ratio (640x480) or 16:9 ratio (640x360). When “Auto Detected” is
chosen, the VGA stream will follow the ratio of the higher resolution
stream, to ensure the identical view of stream 1 and stream 2.
Resolution
Depending on the camera model, the number of available resolutions
may be different. The default resolution setting of the camera may not
necessarily be the maximum resolution of the camera. If the user
wants to use the maximum resolution, it is possible to do it here. The
maximum possible resolution of the stream 2 will be smaller than
stream 1.
Frame Rate
Defines the amount of frames per second.
Video Bit Rate Mode
(only for H.264)
Under “Constant Bit Rate” mode (CBR), the camera keeps the stable
bitrate regardless of the complexity of the scene. Under this mode,
the video quality may vary if the bit rate value is set too low. It is easier
to do storage and network bandwidth consumption estimations under
this mode compared to Variable Bit Rate mode.
Under “Variable Bit Rate” mode (VBR), the camera will keep the video
quality stable while the bit rate may occasionally go up or down,
depending on the complexity of the scene.
Video Max Bit Rate
(only for H.264)
Defines the upper limit of the bitrate (only available under CBR
mode). The bitrate will be floating slightly under that limit. For
example, if the limit is set as 2M, the bitrate will be floating around
1.6~2.0 Mbps.
If the Video Max Bit Rate is chosen as
“Unlimited”, then the “Video Bit Rate”
selection box will appear that defines
the bit rate level.
Video Bit Rate
(only for H.264)
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
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