I think a look at the file in a spectrum analyzer will show a marked
cutoff at around 16kHz if it were ever crushed by an MP3 encoder. There
could be other causes for a cutoff, but if you see audio data above
that, you could reasonably assume that it was never compressed with
MP3.

I'm not sure if MP3 encoders universally inflict the same frequency
cutoff. Someone please correct me if I'm wrong.


-- 
obstreperousness
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