zooropa320 wrote:
Keep in mind that these are different discs (potentially) mastered at
different times but they have been ripped and encoded with the same
settings.
Its actually worse than that. Not easier as others have implied.
Back when I was ripping 40,000 CDs we had a fair number
ordering mistakes that got us two or more copies of the same
CD. Same artist, album, songs, etc. Same UPC code, two or more
physical CDs.
Sometimes the songs had different bits.
We didn't listen to them all, but most of the time
the sound was the same. But a MD5 or SHA1 of the
data was different.
Potential editing differences aside (to fit 40 tracks onto 2
cds) I believe they will sound different even though they were ripped
the same way.
This is, or course, a far more serious difference. I expect them
to sound different. Differing masters, "remastering" etc
are supposed to sound different.
My source discs are original releases, remasters, various artist
compilations and soundtracks. I have identified over 2,500 duplicates
and would like to know if there's an objective way to determine the
best versions (sonically speaking) without having to listen to them all
individually.
I don't know of any, and can't imagine how you could do it.
If the remastered version has more of the room reverb, or
is compressed so that the vocals are more forward, how
can you analyze it without listening and 'seeing' which
one you think is better?
You could tell simple things, say one is 3dB down relative
to the other that has lots of 0dBfs. But how can you
tell if the difference is just caused by multiplying the
values, and thus just has the same signal and the same signal/noise
ratio? or something else?
I'm not sure you can reliably separate a few. Your ears
are going to fatigue long before you can listen to 2000 tunes.
Pat
--
Pat
http://www.pfarrell.com/music/slimserver/slimsoftware.html
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