Difference between revisions of "Constant Bitrate"

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In CBR coding, the [[bitrate]] will be the same for the whole file. It means that each part of your file will be using the same number of bits (if [[bit reservoir]] is not considered). The musical passage being a difficult one to encode or an easy one, the encoder will use the same bitrate, so the quality of your file is variable. Complex parts will be of a lower quality than the easiest ones. The main advantage is that the final files size won't change and can be accurately predicted.
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In CBR (Constant Bitrate) coding, the [[bitrate]] will be the same for the whole file. It means that each part of your file will be using the same number of bits (if [[bit reservoir]] is not considered). The musical passage being a difficult one to encode or an easy one, the encoder will use the same bitrate, so the quality of your file is variable. Complex parts will be of a lower quality than the easiest ones. The main advantage is that the final files size won't change and can be accurately predicted.
  
 
Very often CBR doesn't still mean exactly constant bitrate. For example [[MP3]] uses so called bit reservoir to give small amount of additional bits for use when needed. Still CBR mode is very close to constant bitrate.
 
Very often CBR doesn't still mean exactly constant bitrate. For example [[MP3]] uses so called bit reservoir to give small amount of additional bits for use when needed. Still CBR mode is very close to constant bitrate.

Revision as of 16:19, 13 July 2005

In CBR (Constant Bitrate) coding, the bitrate will be the same for the whole file. It means that each part of your file will be using the same number of bits (if bit reservoir is not considered). The musical passage being a difficult one to encode or an easy one, the encoder will use the same bitrate, so the quality of your file is variable. Complex parts will be of a lower quality than the easiest ones. The main advantage is that the final files size won't change and can be accurately predicted.

Very often CBR doesn't still mean exactly constant bitrate. For example MP3 uses so called bit reservoir to give small amount of additional bits for use when needed. Still CBR mode is very close to constant bitrate.