Re:FLAC – Format overview
by TonyTrapp on Monday September 05, 2022 @05:54PM
(#32729942)
Audiochecker (https://archive.org/details/Audiochecker.v2.0.Beta.Build.457) is amazingly good at detecting WAV/FLAC that is really just a re-encoded from MPEG. It's specific to MPEG though, so it wouldn't be able to detect e.g. Vorbis converted to FLAC.
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Looks like that uses aucdtect:
http://tausoft.org/wiki/aucdtect
I wonder if there is any open source implementation of the algorithm it uses.