[X4U] importing audio CD as AIFF

[Steve Martin]

Yes, CDDB actually uses very "fuzzy" matching.  You can do all kinds of 
minor changes to track length, etc. and it will still be recognized.

I've taken an audio file captured from the digital output of a CD 
player, broken it into tracks manually (obviously resulting in 
different track lengths throughout), burned a CD and had CDDB find it 
just fine.

On Apr 28, 2005, at 7:38 AM, John Lyon wrote:

> I believe CDDB uses the number of tracks and total time to make a 
> match.
> I've burnt CDs from MP3s, and CDDB has recognized the CD.
>
> If your scenario was true, you wouldn't see the track info from CDs 
> you've
> burnt from iTunes album purchases.
>
> And there's this:
>
> <http://www.gracenote.com/cddb2info/using.html>
>
>> # Why do I sometimes get a list of matches (sometimes one) to choose 
>> from?
>>
>> This means that the service did not find an exact match to your disc, 
>> but has
>> found one or more 'close' matches.   Choose the one that looks best, 
>> or if
>> none of the candidates is even close, choose New and submit the new 
>> disc.
>>
>> Here's why this happens:   When record companies reprint a CD that is 
>> already
>> on the market, they often make a new CD master instead of using the 
>> original.
>> As a result, different pressings of the same CD may have slightly 
>> different
>> TOCs. (The TOC is the "table of contents", the list of track lengths 
>> stored on
>> the disc itself.) If you insert your copy of a disc and it's not 
>> found in the
>> database, the server uses a "fuzzy match" algorithm to find one or 
>> more
>> 'close' matches to your copy. The resulting list of matches from the 
>> search
>> will include all candidates for you to choose from.
>>
>> # I put in an AC/DC disc, but the service says it's ABBA!  Why?
>>
>> This should be extremely rare. This would mean that the disc in your 
>> CD-ROM
>> drive just happens to have the exact same TOC as another disc in the 
>> database.
>> The TOC is the "table of contents", the list of song lengths stored 
>> in the
>> disc itself. Because of how the TOC is calculated it is extremely 
>> unlikely
>> that two unrelated CDs would have exactly the same TOC. It does happen
>> sometimes for discs with only one track, but the odds of this 
>> occurring go
>> down with more tracks. If this does occur, just enter the information 
>> for your
>> disc and submit it as a new disc.
>
> On 4/28/05 5:09 AM, "Eugene" <list-themacintoshguy at fsck.net> either 
> wrote,
> forwarded or quoted:
>
>> That's not what I mean.  I'm talking about duplicating an Audio CD so
>> that any computer reading the duplicate Audio CD will query the 
>> correct
>> CDDB information.  AFAIK, recording an Audio CD as individual tracks
>> (regardless of the codec) will cause Audio CDs re-burned from ripped
>> tracks to be unrecognized by CDDB-aware apps.
>
> -- 
> JEL
>
>
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--
Steve Martin
steve at planomartins.com