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Bit-perfect AAC/MP3/etc decoding?, Is it an issue?
mavere
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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mjb2006
post Jan 5 2013, 03:53
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In AAC there can be Perceptual Noise Substitution, so I'm not sure I could expect identical output even from the same decoder.

This post has been edited by mjb2006: Jan 5 2013, 03:54
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benski
post Jan 5 2013, 10:08
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QUOTE (mjb2006 @ Jan 4 2013, 22:53) *
In AAC there can be Perceptual Noise Substitution, so I'm not sure I could expect identical output even from the same decoder.


The random number generator is seeded at the start of the stream from a fixed value, so it is deterministic and repeatable. That being said, seeking or starting mid-stream will cause differences.

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