Digital Watchdog MEGApix DWC-MB45WiAT User Manual page 16

Setup - Video and audio setup
Video configuration
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GOP(Group of Pictures) size - Setup the number of frames (P-frame) which contain only changed information based on basic
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frame (I-frame). For areas with lots of movement, the bigger the GOP value is, only the number of P-frames is bigger. As a
result, video resolution will be low but 'file size' and bit-rate will decreased.
GOP(Group of Pictures) size is:
I-frame and P-frame can be created for H.265(HEVC), H.264 and MPEG4 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 and to decrease image size, set the number of P-frames bigger.
Profile - The profile defines the subset of bit stream features in H.265 (HEVC) or H.264 stream, including color reproduction and
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additional video compression.
H.264: Main, High / H.265 (HEVC): Main
Main - An intermediate profile with a medium compression ratio. The main profile supports I-frames, P-frames, and B-frames.
High - A complex profile with a high compression ratio. The high profile supports I-frames, P-frames, and B-frames.
Smart bitrate control
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Off - Smart bitrate control function is disabled.
CVBR (framerate priority) - This Mode is for cameras which do not want any frame drop, but still want to get a lower
bitrate. When the target bitrate is set to be very low, events with high motion may appear very noisy.
CVBR (quality priority) - When the target bitrate is set to be very low, and an event with high motion occurs, LBR will
try to drop frames, making the final fps lower, making the output frames to have better quality.
CBR - This mode is close to traditional security IPCAM, and it is not designed for LBR. It is provided as an option in LBR library to
help comparison.
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