I just add this free little online tool for all the people interested what the DJ-Software "Traktor" saves inside his proprietary binary chunk inside a PRIV id3 tag.
If you save the few available metadata tags for a mp3 file in Traktor, it looks like this:
Especially the fields Comment 2 and Cat. No. can't be found as standard ID3 tag and are therefore not readable by Mp3tag.
If you analyze such a track with the help of this online tool:
you can see what Traktor copies from the original standard id3 tags and save inside his own proprietary binary chunk in a PRIV tag:
The above tool does NOT UPLOAD your track to any website. Everything is processed in the own local browser.
I would be interested to know why Traktor doesn't use the standard fields and mix it in it's own not that easy readable format.