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? -- ============================================================== Rodney Baker VK5ZTV [email protected] ============================================================== _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
