Re: mp3encoder Digest, Vol 34, Issue 6

Doesn't work that way man - when binary lossy compression is performed (esp with filesize reduction), a binary comparison of any kind/algorithm is simply just impossible. What Rich might have meant was an audiophil-istic comparison, but as this is more subjective and varying from ear-to-ear, person-to-person, environment-to-environment etc etc, cannot automate a computer to do that for you.

hence the creation of such websites such as Hydrogenaudio Forums (http://www.hydrogenaudio.org/forums/index.php), for which mass listening tests/discussions are done to average out listening profiles to determine better encoders, sounds, profiles etc.

cheers!
Edmund



> ------------------------------
> 
> Message: 3
> Date: Tue, 9 May 2006 17:26:22 -0400
> From: "Paul Dejean" <[email protected]>
> Subject: Re: [mp3encoder] mp3 checker ??
> To: "MP3 encoders development list" <[email protected]>
> Message-ID:
> 	<716c0caa0605091426w4606d626icaceeb17a9105681-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> 
> >This is impossible. Only your ears can tell you which sounds closest,
> >and other measures of "closeness" are useless for any purpose.
> I disagree.
> 
> It is possible to see how different two files are from each other.
> For example if you have a 3 byte file (in hex):
> 0F 8E 46
> 
> It would be permissible to say that:
> 0F 8C 45
> 
> Was more similar to the first file than:
> 0F 82 45
> Because the values are closer.
> 
> Maybe it might be possible to convert wav -> mp3 -> wav twice (using
> different encoding settings) and compare the two wav outputs with each
> other and with the original and seeing which one more closely
> resembled the original in a similar method. I don't know of any
> program that could do this though, although writing one doesn't seem
> to be that hard if the two wavs your comparing are the exact same
> number of bytes.
> The program could go byte by byte and compare the value of the new wav
> with the original wav, get the absolute value of the difference and
> add all the values for the different bytes together. This would give
> you a "score" in a way.
> 
> However Alexander is right when he says that it wouldn't give the
> actual difference between the two files, only the technical
> difference. Music is much more then mere data.
> 
> Finally my lurking finished :D
> ~= sciwzard =~

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