Bug #2103 for MP3-Info: bug reading id3v2 fields ending in null

Thu Feb 13 17:07:40 2003 cnandor [...] cpan.org - Ticket created

Date:	Thu, 13 Feb 2003 17:03:06 -0500
To:	bug-mp3-info [...] rt.cpan.org
From:	Chris Nandor <cnandor [...] cpan.org>
Subject:	bug reading id3v2 fields ending in null

From SF.net: Some encoders (EAC - www.exactaudiocopy.de) write to the id3v2 fields with null-terminated strings. I've noticed that mp3s with such fields appear with no data fields when read as $tag = get_mp3tag($file) but successfully retrieve the id3v1s when read as $tag = get_mp3tag($file, 1) I've never used perl before (having learned all I know today pickin through globecom jukebox (www.globecom.se)'s addmp3id3.pl, so it may be that data is being returned, but addmp3id3 isn't dealing with it right. I got these mp3s to read by changing read $fh, my($bytes), $size - $hlen; if (exists $h->{$id}) { to read $fh, my($bytes), $size - $hlen; if (( (length ($bytes)) > 1 ) &&(substr ($bytes, -1, 1) eq "\x00" )) {chop ($bytes);} if (exists $h->{$id}) { around line 487. I suspect there's probably a much more elegent solution though...

Thu Feb 13 18:58:59 2003 cnandor [...] cpan.org - Taken

Fri Feb 14 16:42:03 2003 cnandor [...] cpan.org - Correspondence added

[CNANDOR - Thu Feb 13 17:07:40 2003]: Show quoted text

> Some encoders (EAC - www.exactaudiocopy.de) write to > the id3v2 fields with null-terminated strings. I've > noticed that mp3s with such fields appear with no data > fields when read as > > $tag = get_mp3tag($file) > > but successfully retrieve the id3v1s when read as > > $tag = get_mp3tag($file, 1)

I can't tell what is going on here. I cannot get EAC to read ANY ID3v2 tags (I tried getting it to edit ID3v2.2.0/2.3.0/2.4.0), and it only appears to write ID3v1 (not even ID3v1.1). I couldn't duplicate any of the problems. I'm closing the bug; if the problem persists, please submit the bug again and make one of the problem MP3s available for me to look at. Show quoted text

> I've never used perl before (having learned all I know > today pickin through globecom jukebox > (www.globecom.se)'s addmp3id3.pl, so it may be that > data is being returned, but addmp3id3 isn't dealing > with it right. I got these mp3s to read by changing

Also, I don't know what addmp3id3 is.

Fri Feb 14 16:42:04 2003 cnandor [...] cpan.org - Status changed from 'new' to 'stalled'

Tue Mar 11 20:01:28 2003 Guest - Correspondence added

From:

lj [...] dcs.ed.ac.uk

[CNANDOR - Fri Feb 14 16:42:03 2003]: Show quoted text

> [CNANDOR - Thu Feb 13 17:07:40 2003]: >

> > Some encoders (EAC - www.exactaudiocopy.de) write to > > the id3v2 fields with null-terminated strings. I've > > noticed that mp3s with such fields appear with no data > > fields when read as > > > > $tag = get_mp3tag($file) > > > > but successfully retrieve the id3v1s when read as > > > > $tag = get_mp3tag($file, 1)

> > I can't tell what is going on here. I cannot get EAC to read ANY ID3v2 > tags (I tried getting it to edit ID3v2.2.0/2.3.0/2.4.0), and it only > appears to write ID3v1 (not even ID3v1.1). I couldn't duplicate any of > the problems. I'm closing the bug; if the problem persists, please > submit the bug again and make one of the problem MP3s available for me > to look at.

I lost this bug :) You probably have to rip a CD to get it to write ID3V2, also, the 'stable' version does not support ID3V2 at all. This would seem to have been a problem with 1.00's new 'strip until the last null' behaviour, as I have made an mp3 that works with 1.02, 0.91, but not 1.00 unless my patch is applied. As it is fixed with 1.02's new null-handling behaviour, you can probably mark this bug fixed and ignore the patch.

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Tue Mar 11 20:01:29 2003 The RT System itself - Status changed from 'stalled' to 'open'

Thu May 22 23:19:16 2003 cnandor [...] cpan.org - Status changed from 'open' to 'resolved'

Thu May 22 23:19:16 2003 cnandor [...] cpan.org - Broken in 1.00 added

Thu May 22 23:19:16 2003 cnandor [...] cpan.org - Severity Normal added

Thu May 22 23:19:17 2003 cnandor [...] cpan.org - Fixed in 1.02 added