Digital Watchdog DWC-PV2M4T User Manual page 29

Setup -
Video Setup
6 GOP(Group of Pictures) Size
Set up the number of frames (P-frame) which contain only
changed information based on basic frame (I-frame) from
1 to 30. In videos with lots of movement, if you set GOP size
bigger, only the number of P-frames is bigger. As a result,
video resolution will be low but 'File size' and 'Bit-rate' will
decrease.
GOP(Group of Pictures) Size is..
I-frame and P-frame can be created for MPEG4 and H 264
video compression. I-frame(=key-frame) means the whole
image data for one specific scene of video. P-frame is image
data which has been changed information compared to
I-frame. GOP is made up of one I-frame and corresponding
several P-frames. To improve video quality, set the number
of P-frames smaller. To decrease image size, set the
number of P-frames bigger.
Bitrate Mode
7
Select the bit rate control scheme of video compression
from CBR (Constant Bit Rate) or VBR (Variable Bit Rate).
Quality
For VBR, The Target Quality of video can be setup. Set from
1 to 5(Highest). Default is 3.
CBR
To guarantee the designated constant bit rate, the quality
of video are controlled in this mode. The quality of video is
likely to be varying when network traffic is changing.
VBR
To guarantee the designated quality, the bit rate of video
stream is changed in this mode. The frame rate of video is
likely to varying when network traffic is changing.
This category will be disabled if you select the codec.
Target Bitrate
8
For CBR, you can set the Target Bitrate. Set the target
bitrate value from 500 to 8192 kbps. Default is 5478.
Image Transfer
When MJPEG codec is selected, it will be able to set whether
to use the relevant channel for image transfer. This option
is available only for Channel 2.
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