VBR
VBR is a compression coding method for audio and video data that changes the amount of data (bit rate) transferred per unit of time.
With VBR , it is possible to reproduce data while maintaining picture quality and sound quality by transferring at a high bit rate in places where the data changes drastically in the file to be transferred. On the contrary, if the bit rate is lowered in a monotonous place where there is little movement, the amount of transfer can be suppressed without waste and the transfer efficiency can be improved.
VBR can be used with MP3, WMA, AAC, etc. among the major file compression encoding methods and can be used with MPEG-2, etc. as video method.
Of the VBRs, the method that adjusts the amount of data to be transferred to be close to the average of the whole is called ABR (Average Bitrate). For VBR, the method where the bit rate is predetermined by a fixed value is called CBR (constant bit rate).
