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Topic: Advanced ID3V2 Info, Multiple instances of <comm>< Next Oldest | Next Newest >
Skeezix
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Posted: July 02 2007,03:44
Sorry for posting so many questions all at once... I'm trying to normalize (i.e. DB "normalize") mp3 files that were tagged using Musicmatch JB version 7.5 without blowing away all the tag data...

Using a small mp3 file, and MMJB, I typed "<field>TEST" (where "field" is the name of the MMJB user-editable field and "TEST" is the word I placed into that field) into every user-editable field that MMJB provided.

Then I examined my TEST file with MP3TS Browse/Edit Tags & Flags window and looked in the ID3v2 Tag Info box to see the results.

In the Comment box of the Some Additional Useful Fields pane I found "Notes TEST" so I know that this Comment field comes from the MMJB Notes field.

In the Advanced ID3v2 Info window, I found the following in the Additional Frames in Tag list (showing tagname and contents of the Frame Contents field) in the following order:

USLT = Unsupported binary data
COMM = Bios TEST
WOAF = audio file url TEST
WOAR = artist url TEST
WCOM = buy cd url TEST
COMM = Mood TEST
COMM = Situation TEST
COMM = Tempo TEST
*TLEN = a 6-digit number
COMM = Pref TEST
*TPUB = Ohr
*TPE2 = Ash Ra Tempel

The * indicates the data was inserted by MMJB.

Question 1: Why didn't mp3ts identify the other ID3v2 frames and show <blank> in the Frame Contents field?

Question 2: If mp3ts only identifies tags (frames??) that contain data, is there some way to force it to list empty frames?

Question 3: What determines the order in which the tags (frames??) and various COMM fields are listed?

Question 4: If there is a specified order, can I rely on that order when setting up an Excel list for importing tag data back into the mp3 files?

Question 5: Some COMM fields had data in the Content Description line, other COMM fields did not. Where did the displayed data come from?

Question 6: Is there a maximum length to the ID3v2 tag area and if so, what is it?

Again, sorry for all the questions but I just don't want to screw up several years of manual data entry.
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Magnus Brading
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Posted: July 02 2007,12:39
1.
What do you mean "didn't identify the other ID3v2 frames and show <blank> in the Frame Contents field". Which other ones?

2.
It shows empty frames too.

3.
The order in which they are stored inside the tag.

4.
It depends on the program writing the tags, if it always uses the same order.

5.
I'm not sure what you mean by "where did it come from"? It was written by MMJB?

6.
No, unlimited (at least up to 4 GB).

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Skeezix
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Posted: July 03 2007,00:47
Thank you for your replies. I'm off the ground again!

About #1 and #2: I was thinking that a tag contained all frames whether they contained something or not. I haven't looked at the ID3v2 spec yet (thanks for the link to that) but I will during my nightly insomnia attack...

Meanwhile I will assume a tag only contains the frames that were inserted by something, even of those frames were empty.

#3: Therefore if using MP3TS, the order is determined by the template string in the File Row Format line in the Create Custome Lists tool.

#4: Sounds good to me.

#5: The bottom-most field in the Advanced ID3v2 window - this is usually greyed out, but sometimes it contains text. I was curious where this came from. Obviously from MMJB when it edited the MP3 file, so it should be defined somewhere in the ID3v2 spec. I'll look it up.

#6: The reason I asked if the tag is limited in size comes from the upper left pane of the Advanced ID3v2 Window. It displays a value for Tag Size and a Used Space.

Which brings me to an off/topic question about the message board GUI - When writing this message, a line below the box states the maximum message length (76800) but nowhere does it tell me how much of that I have used....

You have an extremely comprehensive application with excellent support. I'll be registering it today!
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2 replies since July 02 2007,03:44 < Next Oldest | Next Newest >

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