On Tue, 5 Feb 2008 21:01:32 +0000, Stimpy
wrote:

I've been sent some .mp3 files that claim to be 320 kbps but they sound
pretty ropey. Is there any way I can detect if they've been re-encoded from
a lower bitrate?

TIA

Do an FFT- the maximum frequency they contain will be a clue. If they
are native 320k, they should go all the way to 20kHz; if they have
been 128k at some point, they will probably stop somewhere around
16kHz.

d

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Pearce Consulting
http://www.pearce.uk.com