Variable bitrate (VBR) is a term used in telecommunications and computing that relates to the bitrate used in sound or video encoding. As opposed to constant bitrate (CBR), VBR files vary the amount of output data per time segment. 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. The average of these rates can be calculated to produce an average bitrate for the file.
MP3, WMA, Vorbis, and AAC audio files can optionally be encoded in VBR. 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. Additionally, variable rate encoding is inherent in lossless compression schemes such as FLAC and Apple Lossless.
Other articles related to "bitrate, bitrates, variable bitrate":
... Average bitrate (ABR) refers to the average amount of data transferred per unit of time, usually measured per second, commonly for digital music or video ... It can have higher bitrate and lower bitrate parts, and the average bitrate for a certain timeframe is obtained by dividing the number of bits used during the timeframe by the number of ... Bitrate is not reliable as a standalone measure of audio/video quality, since more efficient compression methods use lower bitrates to encode material at a similar quality ...
... input file and automatically calculates possible bitrate range and/or average bitrate ...
Famous quotes containing the word variable:
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—Edmund Spenser (1552?1599)