Bit rate

From VideoLAN Wiki
(Redirected from Constant bitrate)
Jump to navigation Jump to search

The bit rate or bitrate of media measures the bits used to store the data per second (kilobits per second, kbit/s or kbps). It is formally defined as the product of (bits per sample) × (samples per second).

A constant bit rate or constant bitrate (CBR) is a bit rate that does not change.

A variable bit rate or variable bitrate (VBR) is a bit rate that varies depending upon the complexity of the data.

An average bit rate or average bitrate (ABR) may refer to either total bits ÷ time or a form of VBR.

Some common bit rates for mp3 files are 128 kbit/s (standard), 192 kbit/s (medium quality), 256 kbit/s (high quality) and 320 kbit/s (highest quality).
A low bit rate (below about 128 kbps) makes for poor audio quality.