[paranoia-dev] grip/cdparanoia/freedb disagree on track length

[Chris Ross]

   This may not be very helpful in the end, so I'm not CC'ing the list.
But I thought I'd describe what I do know about this sort of thing.

   Multimedia CD's are different than audio-only CD's.  Generally,
this is most noticable by a gap in the data between the audio
data, and the data data.  I have seen differences like this come about
before, on other similarly constructed CD's.  I think the difference
is how you look at the CD.  I'm not actually sure how cdparanoia
(and grip?  I'm not sure what grip uses to get that.  I assume it uses
something external to generate that info.  Perhaps cdparanoia.)
generates that number, tho.  In my experiences with multimedia
commands (CD audio commands to the CD-ROM device), I know
only of how to get the start position of each track out of the TOC.
This is the reason for the difference you see.  The start position
of "track 7" is beyond the change-of-format gap, and if it were all
audio, with no such gap, then it would mean that track 6 was
9+ minutes in length.  It must be that there is some other method,
rather than just a simple TOC inquiry, that's being used to determine
the length of audio data actually available in track 6.

   Again, it's sortof half an answer, but hopefully it will answer some
questions, and wasn't just a repeat of things you already knew.

                                                     - Chris


--
Chris Ross
cross at distal.com

<p>On Thursday, January 23, 2003, at 09:24 PM, Jamie Zawinski wrote:

> I have a CD where cdparanoia and Grip / FreeDB disagree on the length
> of the last audio track.  Grip and cdparanoia think the track is of
> length 7:06, but the FreeDB data seems to say the track is 9:38.
>
> The CD in question is "Phi in the Sky" by Kidneythieves.
> It has 6 tracks, and tracks 1-5 are fine / consistent.

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