[FFmpeg-user] Compare quality of 2 audio files

[Rodney Baker]

On Sunday, 2 July 2017 0:31:03 ACST Rodolfo Medina wrote:

> > 
> > But suppose you have a song, or any piece of music...  a certain
> > particular
> > precise recording, just that one...  and that you find in internet two mp3
> > different files of that song, from two different web sites, both same size
> > in megabytes.  Suppose that the test with Audacity, which we have earlier
> > much spoken of, reveals a difference between them: this means that a
> > portion of the original WAV file during the MP3 conversion has been
> > discarded in more quantity in, say, file1.mp3 than in file2.mp3 (in fact
> > it can be heared).  Or also suppose that both files are in wav format but
> > still Audacity reveals a difference between them (because one of them
> > could be - as far as we know - the result of a previous unknown
> > conversion).  Then I expect if would be technically possible that we
> > could give an algebraic plus or minus sign to that discarded portion and
> > tell - objectively and not by a simple personal listening feeling - which
> > of the two is the one that contains more information and which less -
> > that's what I would reasonably expect.
> It's as if in Algebra we can do |a - b| but don't know wether it's a < b or
> b < a...
> 
> Rodolfo

What about an FFT analysis?


-- 
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Rodney Baker VK5ZTV
rodney.baker at iinet.net.au
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