Difference between revisions of "Bit rate"

From VideoLAN Wiki
Jump to navigation Jump to search
(Created page (as always, from my own words). This ought to be useful)
 
(Expand with information about average bitrate, a succinct (and copyright-ineligible) summary of the Wikipedia page (revision))
 
(4 intermediate revisions by the same user not shown)
Line 1: Line 1:
−
{{wikipedia|Bit rate|MP3#Bit rate}}
+
{{wikipedia|MP3#Bit rate|Bit rate|Average bitrate}}
  
−
A '''bit rate''' is a measure of bits transferred per unit of time.
+
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) × ([[sample rate|samples per second]]).
  
−
As it pertains to music, bit rates are measures of the samples in an electronic music rendition. The ''de facto'' unit is kilobit per second or kbit/s. Common bit rates with [[mp3]] files include 128 kbit/s (standard), 192 kbit/s (medium quality), 256 kbit/s (high quality) and 320 kbit/s (highest quality). A high bit rate does not necessarily make the sound better but a low bit rate (e.g. 32 kbit/s) sounds bad.
+
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 <code><var>total bits</var> &divide; <var>time</var></code> or [https://wiki.hydrogenaud.io/index.php?title=Average_Bitrate 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).<br>
 +
A low bit rate (below about 128 kbps) makes for poor audio quality.
  
 
[[Category:Glossary]]
 
[[Category:Glossary]]

Latest revision as of 02:26, 16 May 2019

Wikipedia has information on these entries:

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.

Retrieved from "https://wiki.videolan.org/index.php?title=Bit_rate&oldid=61381"