My iTunes library and metadata/ID3 tags issue

Since 2010, iTunes is the only media player I use to play music. My library consists of music purchased from the iTunes Store, CD rips and stuff many artists these days release as freebies on the internet to promote a new album. Also, M4A and MP3 are the only formats I use so far.
Since iTunes, I really got into editing my library's metadata tags by hand, in order to create a custom archive which serves my preferences best. I should mention that besides iTunes being the only software I use to play my music library, it's also the only software I use to edit their metadata. Also, before iTunes – when my library was on different media players – I never bothered with editing them.
A few days ago, I found how a lot of people in forums complain about the way iTunes edits and stores metadata. So, I experimented and moved a few of my songs to other media players after editing their tags within iTunes. And indeed the tags and/or artwork were often displayed messed up and/or incorrect, some times partially and some times completely.
Some people were referring to the version of the ID3 tags being the issue, while others suggested using the "convert ID3 tags" feature. I myself am a little bit confused. "Converting the ID3 tags" wasn't available for my M4A files and once I performed it for my MP3's I didn't know which setting I should apply or what version to choose. I chose one version randomly but I'm not sure what happened.
My goal is to make my music library able to play and display my custom metadata on the majority of the popular media players. I hope that firstly this is possible and that secondly it won't be a solution which requires me going through every single song individually.
I really hope that all those years work on my library wasn't for nothing.
I'm using a MacBook running Snow Leopard 10.6.8 and my iTunes version is 10.7
While my music library is more important that my iTunes version, I do like iTunes 10 more than 11.
I apologize for any grammar mistakes, since English is not my first language. Thank you all for your time and any suggestion is welcome.

itsjamesd wrote:
Hello turingtest2 and thank you for your reply.
In response to "a possible cause of problems is multiple embedded tags", what exactly does that mean and how can I avoid doing it in the future?
Anything ripped with iTunes should get a single tag. If multiple tags in some of your older mp3 rips are the cause of the problems when you try to access the files elsewhere then you should apply the suggested remedy selectively, not to the whole library indiscriminately. Once fixed you shouldn't have the problem again unless you use different ripping software. If so check the options to ensure you generate a single ID3v2.3 tag. Downloads from elsewhere are pot luck.
If I use Convert ID3 Tags>None before converting to v2.3 as you suggested, how many times is "several times" and why do I have to do it more than once? Also, what are your thoughts on 'v2.3 vs. v2.4'?
Several is at least two, but more could be needed if a file has both v1 and v2 tags in multiple languages. If there are two tags, the first conversion to none should remove the first one, and the second conversion the second. Experiment, And stick to v2.3.
In response to "the process removes any embedded art but otherwise preserves the data that iTunes knows". All fields excluding cover art remain the same? Does that mean that I will have to start from scratch and apply new cover art individually for each album? That would be too time consuming given the fact that I embed custom art.
Yes, everything but artwork is held in the iTunes database and is restored with the final Convert ID3 Tags... v2.3. Use Doug's scripts SaveAlbumArtJpeg before you start and RestoreArtworkFromAlbumFolder afterwards to save and the restore your existing artwork.
Also, what happens with my M4A files' metadata? ID3 tags are only used for MP3's, right?
Yes, m4a/aac files have a different tag mechanism. Multiple ID3 tags is just one possible issue that you might have. You said:
So, I experimented and moved a few of my songs to other media players after editing their tags within iTunes. And indeed the tags and/or artwork were often displayed messed up and/or incorrect, some times partially and some times completely.
It might be worth going into some more detail about exactly what differences you noticed. iTunes can automatically associate (instead of embedding) artwork when it can match the album in the store which could be why some tracks didn't get artwork.
tt2

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