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Advantages and Disadvantages of Variable bitrate (VBR)
The advantages of VBR are that it produces a better quality-to-space ratio compared to a CBR file of the same size. The bits available are used more flexibly to encode the sound or video data more accurately, with fewer bits used in less demanding passages and more bits used in difficult-to-encode passages.
The disadvantages are that it may take more time to encode, as the process is more complex, and that some hardware might not be compatible with VBR files.
Perhaps confusingly, a newer acronym for VBR is also becoming prevalent: CVBR. This means Constrained Variable Bit Rate. In CVBR encoding, the maximum allowed bit rate and (usually) the average bit rate are requested up front by the user of the encoding tool. Since this ability only exists upon encoding, CVBR and VBR are essentially the same thing once they have been implemented. Whilst CVBR introduces massive advantages in tweaking down file sizes, this tweaking can become a long process of trial and error. Specifying a higher maximum or average may simply make the file bigger with no discernable quality effect beyond the potential for stutter when streaming the file. However, reducing these criteria too low will eventually lead to quite drastic losses in quality.
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