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compression math question
post Nov 19 2011, 23:27
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Lossy music file, let's say a modern mp3 or aac, is A.

A is converted to pcm wav, which is now B.

B is compressed using a lossless format such as FLAC or WMAL or Wavpack, which is now C.

For file size, is the following true in all cases?

B >= C >= A
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post Jan 11 2012, 01:21
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Remember that we're starting with a lossy file A. MP3, for example, will tend to cut out high frequencies due to the psychoacoustic model used. If the compression algorithm used in the lossy format is less efficient than that used in the lossless format the lossless file could well end up smaller than the lossy file.
This is not the normal case, however it should be mentioned.
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