Hi, Florian, I'd like to request placeholders %_cover_height% and %_cover_width%, to obtain the dimensions of the first cover in the file. Both would return an empty string if the file has no covers, just like the empty string returned by %_covers% when there are no covers in the file.
Why would I want this? I've got around 5000 ripped albums in my music server (from personally owned CDs), which is over 64000 tracks. I've been collecting them for a number of years and I when I started I would put any old cover art into the FLAC or MP3 files just because I was too lazy to scan when I couldn't find good cover art on Amazon or elsewhere. Now I'd like to go back and scan good covers for CDs that have small or poor quality cover art.
With the above new placeholders I could use MP3tag to export a CSV listing of all the albums with the cover height and width shown, sort that list in a spreadsheet, and extract a listing of all albums missing cover art or with cover art smaller than 500x500.
Happy New Year!