Data appended to some MP3 track titles

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phule
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Data appended to some MP3 track titles

Post by phule » Fri Jul 06, 2007 7:56 pm

Why, after ripping/encoding a 21-track CD with Max 0.7.1 and adding it to
iTunes 7.2, are 3 of the tracks missing track numbers plus additional data
from Max is appended to each of the 3 track titles?

I ripped and encoded a CD, creating 21 mp3s at 128 cbps. I
dragged-n-dropped the resulting folder onto the iTunes 7.2 icon. When I
selected the album title, i saw the 3-track titles had no track number
which was easily fixed manualy. But on further investigation I discovered
that these track titles were permantly appended with data created by Max
0.7.1. This data cannot be copied to the clipboard nor can it be
permanently erased. Following is just one of the appendages to one of the
track titles.

TRCK 8/21TPOS 1/1TLN 438000TENC LAME 3.97 (Max 0.7.1)TDEN
2007-07-06T00:46:TDTG
Bob

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sbooth
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Post by sbooth » Fri Jul 06, 2007 8:12 pm

That looks like ID3 data, but why iTunes would be appending it to the track's title I can't say. In the past, iTunes has suffered from notoriously bad ID3 handling. If you open the file in another application that handles MP3s (for example QuickTime Player) does the data appear correctly?

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phule
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Post by phule » Sat Jul 07, 2007 12:15 am

sbooth wrote:That looks like ID3 data, but why iTunes would be appending it to the track's title I can't say. In the past, iTunes has suffered from notoriously bad ID3 handling. If you open the file in another application that handles MP3s (for example QuickTime Player) does the data appear correctly?
Yes, it does look correct in Quicktime. I just finished encoding the CD with iTunes 7.2 and no track title appending. However I did notice that about half the tracks are "said" (by the summary page) by iTunes that it can't locate them but it can find & play them just fine.
Bob

maxlover
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Post by maxlover » Sat Jul 07, 2007 11:50 am

Why, after ripping/encoding a 21-track CD with Max 0.7.1 and adding it to iTunes 7.2, are 3 of the tracks missing track numbers plus additional data from Max is appended to each of the 3 track titles?
Are those titles especially long ? I mean longer than, say, 128 characters ?

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phule
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Post by phule » Sat Jul 07, 2007 8:08 pm

maxlover wrote:
Why, after ripping/encoding a 21-track CD with Max 0.7.1 and adding it to iTunes 7.2, are 3 of the tracks missing track numbers plus additional data from Max is appended to each of the 3 track titles?
Are those titles especially long ? I mean longer than, say, 128 characters ?
The shortest title is 56 characters and the longest is 110 characters.
Bob

maxlover
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Location: Belgium

Post by maxlover » Sat Jul 21, 2007 8:22 pm

phule wrote:
maxlover wrote: Are those titles especially long ? I mean longer than, say, 128 characters ?
The shortest title is 56 characters and the longest is 110 characters.
Strange. I have seen this happening, but only with tracks whose tiltle was longer than 128 bytes. 128 bytes, not 128 characters : if you use characters outside of the small latin-1 repertoire, each character is encoded by LAME using several bytes (this is called UTF-8 ). The problem with titles, or with any ID3 frame, longer than 128 bytes, is that iTunes does NOT handle the 'synchsafe integers' correctly.The binary representation of 'synchsafe integers' become different from that of regular unsigned integers when the value exceed 128, and the length of the frames is encoded with thoses 'synchsafe integers'.

Problem in Apple's garden, thus.

Best regards.

maxlover
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Re: Data appended to some MP3 track titles

Post by maxlover » Thu Aug 02, 2007 7:31 pm

I checked again using the latest iTunes version (7.3.1). It seems that the bug has been corrected.

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