What does the bitrate in video conversion mean? What is the function of its size?

The fixed bit rate is constant bit rate (CBR. This is a term used to describe the quality of communication service (QoS, quality
Service. The bit rate is basically maintained at the average bit rate. The implementation is simple. For complex scenarios, mosaic may occur due to insufficient bit rates. For simple scenarios, the coding space cannot be fully utilized.

Variable Bit Rate (VBR. This is a term used to describe the quality of service (QoS for quality of service.

VBR, (2-Pass VBR ),
"Secondary Processing VBR ". The encoding efficiency is the highest through two processing operations on the entire video source: the first time to determine where is a complex scenario and a simple scenario, the second time Root
The upper and lower limits of Data bit rates are used to allocate more bit rates to complex scenarios. It can be seen in the experiment that tmpgenc indicates that the image is not previewed before 50% during this encoding, And the progress indicates that
The value is 0. This code stream control method should get the best quality under the given bit rate, but it should be allocated twiceAlgorithmThe relationship is huge. It takes the longest time at the same time. Some other encoders even have three bit rate optimizations.