AVer FC2020-P&PW user manual - Manual (Page 61)

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Advanced Mode
Click Apply to save the configuration.
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Resolution: There are 5 resolutions can be chosen – 1920x1080, 1280x720, 640x480,
320x240, 176x144.
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Rate Control: There are CBR (Constant Bit Rate) and VBR (Variable Bit Rate) to use.
CBR: 32Kbps~8Mbps (the higher the CBR is, the better the video quality is).
VBR: 1(Low) ~10(High) – Compression rate, the higher the compression rate, the better
the picture quality is; vise versa. The balance between VBR and network bandwidth will
affect picture quality. Please carefully select the VBR rate to avoid picture breaking up or
lagging.
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Video Frame Rate: The video refreshing rate per second.
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GOP Size: It means "Group of Pictures".
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Video Format: H.264 or JPEG
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RTSP Path: It’s a URL address