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A comment on FLAC – Format overview. Parent comment

Re:FLAC – Format overview by dmitri_ignat on Monday September 05, 2022 @04:59PM (#32729407)
You can view it with a spectrogram, audio which has been lossily encoded will have a telltale cutoff in the high frequencies. The lossier the encoding, the lower the frequency ceiling will be.
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Re:FLAC – Format overview by sdenton4 on Monday September 05, 2022 @05:36PM (#32729779)
Another thing to look for is deleted or very flat energy between harmonics. Reducing bit rate in inter harmonic regions is most of what's meant by 'psychoacoustics.'

I imagine low pass filtering depends a bit on which compression you're using.

None of these tricks will work for detecting GAN compressed audio, though.

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