Single-pass encoding is used when the encoding speed is most important - e.g. Single-pass encoding analyzes and encodes the data 'on the fly' and it is also used in constant bitrate encoding. VBR is created using so-called single-pass encoding or multi-pass encoding. Methods of VBR encoding Multi-pass encoding and single-pass encoding 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. 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 advantages of VBR are that it produces a better quality-to-space ratio compared to a CBR file of the same data. Additionally, variable rate encoding is inherent in lossless compression schemes such as FLAC and Apple Lossless. Variable bit rate encoding is also commonly used on MPEG-2 video, MPEG-4 Part 2 video ( Xvid, DivX, etc.), MPEG-4 Part 10/H.264 video, Theora, Dirac and other video compression formats.

MP3, WMA and AAC audio files can optionally be encoded in VBR, while Opus and Vorbis are encoded in VBR by default. The average of these rates can be calculated to produce an average bitrate for the file. VBR allows a higher bitrate (and therefore more storage space) to be allocated to the more complex segments of media files while less space is allocated to less complex segments. As opposed to constant bitrate (CBR), VBR files vary the amount of output data per time segment.

Variable bitrate ( VBR) is a term used in telecommunications and computing that relates to the bitrate used in sound or video encoding.

Files in which the rate of bit transmission is non-constant

What is vbr m3u file