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Bit-perfect AAC/MP3/etc decoding?, Is it an issue?
post Jan 5 2013, 00:43
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Sorry if this is easily answered elsewhere.

My question is that in a comparison of lossy-format decoders between, let's say, iTunes and Foobar and Winamp, will the output (edit: of a single source file) vary between decoding implementations?

Or is it that once a decoder follows a specified format, all output is equal assuming there are no bugs?

This post has been edited by mavere: Jan 5 2013, 00:51
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post Jan 5 2013, 01:14
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Unlike encoding, I believe all decoders are supposed to be the same.
Within some aurally insignificant reference range. Beyond that, I donít think differences are uncommon, albeit slight.

Decodes can differ due to differences in rounding between CPUs, programming implementations, dither, etc.

Will the outputs be equal? Perhaps not. Does it matter? Not unless something is broken.
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