Variable bit rate in the context of MPEG-2

Variable bit rate in the context of MPEG-2

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⭐ Core Definition: Variable bit rate

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 and AAC audio files can optionally be encoded in VBR, while Opus and Vorbis are encoded in VBR by default. 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.

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Variable bit rate in the context of Asynchronous communication

In telecommunications, asynchronous communication is transmission of data, generally without the use of an external clock signal, where data can be transmitted intermittently rather than in a steady stream. Any timing required to recover data from the communication symbols is encoded within the symbols.

The most significant aspect of asynchronous communications is that data is not transmitted at regular intervals, thus making possible variable bit rate, and that the transmitter and receiver clock generators do not have to be exactly synchronized all the time. In asynchronous transmission, data is sent one byte at a time and each byte is preceded by start and stop bits.

View the full Wikipedia page for Asynchronous communication
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Telecommunications → Computing → Bitrate → Constant bitrate → Data → Average bitrate → MP3 → Windows Media Audio → Advanced Audio Coding → Opus (audio format) → Vorbis → MPEG-2 → MPEG-4 Part 2 → Xvid → DivX → MPEG-4 Part 10 → Theora → Dirac (codec) → Lossless compression → FLAC → Apple Lossless →