AVer SF2121H Series - Manual (Page 21)

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Name Function
VBR (Variable Bit Rate) by default use this setting if there is a
need to maintain the image quality whenever there is lot of
activities on the scene or no motion. This setting keeps the video
stream constant as possible which increases the bandwidth
requirement when there is high motion and decreases when
there is no motion. The bandwidth must be able to accommodate
high throughputs.
CBR (Constant Bit Rate) use this setting if there is bandwidth
concern. This setting is restricted to keep the bit rate setting. This
could affect the image quality and frame rate if there is high
activity that result in a bit rate that is higher than the set bit rate.
Sm a rt St re a m
(1)
(2)
Name Function
(1) Stream Select the streaming source. This option is only applied to
H.264.
(2) Quality High - video quality of selected area is better than that of
un-selected area.
Low - video quality of selected area is worse than that of
un-selected area