ACTi ECD-1000 - Manual (Page 63)

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ECD-1000 User Manual
63
Item Description
Bitrate Mode 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.
Max Bitrate
(only for H.264)
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 Max Bitrate is “Unlimited”, then the Bitrate
selection box will appear that defines the bit rate level.
Bitrate
(only for H.264)
When Max Bitrate is “Unlimited”, the user can define the
AVERAGE bit rate. For example, if the Bitrate is 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.
Video Quality
(only for MJPEG)
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. However, note that local Live View cannot display
streams other than H.264.
Quality
(only for H.264)
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.
GOP 1 I-Frame
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 c hanged to “1 I-frame per 5 seconds”, then there will be
one I-frame, followed by 149 P-frames. In case of the static