There are many tags not listed in placeholders used in Mp3tag (for example SOURCE). Before removing I want to look at them. Is there any way?
I mean something like this:
Export tags of all files with $loop(). Here I need some function like $get_tag_name(x), where x is the number of tag within all tags in that file. So I could get all tags with $get_tag_name(1), $get_tag_name(2), $get_tag_name(3)..., then I put the tagname, when it founded first, to the end of a constant, with $puts(). As a result, I can do a list of the names of all founded tags in all files.
Then, to show (and sort by) founded tags in columns: may I use any (not listed) tagname as placeholder in format %tag_name% in columns and filters?
Advanced Tags dialog's "Metadata" shows two unlabelled items, the first of which is a name, which may be the name that the MP3tag UI uses to refer to the property e.g. BAND, or if there is none, a name actually used in the file tag e.g. ALBUM ARTIST - not necessarily the same thing. Which name appears depends on Mp3tag's default mapping - see Help "Names and mapping of ID3v2/WMA/MP4 tag fields" - and user mapping - see Options Mapping.