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List:       kde-multimedia
Subject:    Re: Bug#37185: Tracknr missing in ID3 Editor
From:       Scott Wheeler <scott () slackorama ! net>
Date:       2002-01-21 21:58:00
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Well, like many things this depends on the implementation.  In id3lib and in 
most id3v2 implementations when a tag is written it is also padded with blank 
space (up to 2k) to leave room for further revisions without having to move 
the file around.

So, no, if you change one letter, or add one frame or even add five frames it 
probably won't need to move the rest of the file around.  

The reason that it's organized this way is for streaming.  If you want to be 
able to identify an mp3 stream the content description should be at the 
beginning of the file.  

Make sense?

-Scott

On Monday 21 January 2002 06:55 am, Rolf Magnus wrote:
> On Sunday 20 January 2002 19:51, Scott Wheeler wrote:
> > Yes, but only for id3v1--that's what this thread been discussing.  I'm
> > one of the pseudo-developers for id3lib, which supports id3v2.  id3v2 in
> > addition to offering a lot more frame types doesn't have length limits on
> > length for the frame and other types of goodness.
>
> How does id3v2 behave wrt. to writing time? since v1 is at the end of the
> file and has a fixed length, you never need to rewrite the whole file if
> you want to change one letter of a tag field. ogg/vorbis OTOH requires you
> to copy the whole file for such changes. If you have a 120MB Mp3 on an NFS
> server (yes, I have those), this would be very expensive.
> OTOH, I didn't finish KFileMetaInfo completely, and when I add support for
> groups of items, one could have both i3v1 and v2 by putting them in
> different groups.
>
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