[mb-users] Re: Re: Clean vs. Explicit versions

[Frederic Da Vitoria]

2007/10/28, Brian Schweitzer <brian.brianschweitzer at gmail.com>:
>
>
> > Brian, Chad said explicitly "same PUIDs and same durations". So
> > admitting
> > whole releases such as these exist (all tracks are identical in length
> > and
> > PUIDs but differ in the audible content), what should we do?
> >
>
> Yes, but that's my point...  If we really had 2 releases, one explicit,
> one clean, and we had
>   * identical tracklists, and
>   * each track had an identical length, and
>   * verifiably correct puids, and
>   * each puid is attached the respective matching track-pair was
> identical, but
>   * the clean and explicit tracks are audibly different
> Then I would agree.
>
> However, that premise is, as I see it, possible in a theoretical sense
> only.  The point where it breaks is in the puids.  If there is an audible
> distinction of the degree that a clean vs explicit version would entail,
> then it is theoretically impossible that each of the 2 tracks would have the
> same puid.  That's why I'd asked earlier if anyone had an example where this
> wasn't the case - there cannot be such a case.  The puid for each version
> would be different.
>
> That said, then, if we're talking the theoretical case above, then sure,
> merge them.  But as that's an impossible case to actually happen, if we're
> talking about the real world case where we have:
>
>   * identical tracklists, and
>   * each track had an identical length, and
>   * verifiably correct puids, and
>   * the clean and explicit tracks are audibly different, and
>   * each puid is attached to the respective matching track, BUT
>   * the puid for the clean version does not match the puid for the
> explicit version.
>
> Then I say no, the two ought not to be merged.


It seems all of us agree, except for the possibility of the problem.
Actually, if Chad is right, we should maybe remove the "U" from PUID, since
it would mean the IDs are not Unique!

Brian, do you actually KNOW it is impossible, or do you only believe it can
not happen? AFAIK, the PUIDs could be calculated by taking samples at
regular intervals (say at 5 seconds intervals), which could miss the bleeps
sometimes. (I did not say they are calculated this way, just that I never
saw any indication this was not the case). Here
http://blog.musicbrainz.org/archives/2006/03/finger_fingerpr.html , it is
explicitly said: "It should have a lot fewer duplicates and collisions than
TRM." "less" at least means collisions can happen :-(

Chad (or someone else), do you have or can you put your hands on such an
occurrence (same track lengths, same PUIDs but different audible content)?
So that we stop using "if"s! And we can start discussing what we should do
WHEN it happens.

-- 
Frederic Da Vitoria
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