Digital Watchdog DWC-MB45iALPRTW User Manual page 18

Setup - Video & Audio Setup
Video Configuration
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GOP (Group of Pictures) Size - Set up the number of frames (P-frame) which contain only changed
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information based on the basic frame (I-frame). Regarding videos with lots of movement, if you set the GOP
size bigger, only the number of P-frames is bigger.
As a result, the video resolution will be low but 'File size' and 'Bit-rate can be decreased.
GOP (Group of Pictures) Size -
I-frame and P-frame creation for MPEG4, H.264, and H.265 (HEVC) video compression. 'I-frame', also known
as 'key-frame', refers to the complete image data for a specific video frame. 'P-frame' refers to the changes
in the image in comparison to the previous video frame. As a result, the GOP consists of one I-frame and
several P-frames. For improved video quality, use a lower number of P-frames for this setting.
Profile - The profile defines the subset of bitstream features in H.264, H.265 (HEVC) stream, including color
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reproduction and additional video compression.
H.264: Main, High / H.265 (HEVC): Main
Bitrate Mode - Select the bit rate control scheme of video compression from CBR (Constant Bit Rate) or VBR
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(Variable Bit Rate).
This category will not appear if you select the codec.
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