What is variable rate encoding?

Answer: Variable bit rate encoding: From the perspective of ensuring video transmission quality and making full use of information, variable bit rate video encoding is the most reasonable. The reason is: the peak information volume of the video source itself is changing. If the bit rate of the output stream is to be fixed, the transmission system needs to be designed according to the peak information volume of the source, but most of the time it is not. When a peak amount of information occurs, in order to ensure a fixed bit rate, some padding codes are usually inserted, which wastes video resources. Using variable code rate coding, it can be allocated according to the amount of information of the source itself, thereby effectively utilizing information resources.