The difference between VBR& CBR encoding mode

CBR (Constant bit rate) & VBR (Variable bit rate) are supported by Haiwei video encoder, so what are differences between CBR and VBR? What is the best selection for different situation?

If enable CBR, it would taken less bandwidth when video bitrate is fluctuating, but the video quality would get effect. Imagine these extremes of bitrates for a 1080p video: 1 bps, and infinite bps. At 1 bps, you couldn’t build up a picture. A single bit per second would only be enough to signal a player to show one of two colors in the frame once a second. There would be some empty part when it lost, same as this

If enable VBR, it would be good video quality when video bitrate is fluctuating, Why? Here is the reason, if the video bit rate were get lost when enabling VBR, the encoder will grab the losing bit rate from the video source, it may cause large bit rate temporary. Internet Congestion would be occurred when fluctuationtakes place and it’s transmitting by WAN.

The bandwidth is the main element too, so do you get the idea in your situation?
Written& Edited By Shenzhen Haiwei Vision Technology

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