Hey, I was trying to achieve this a couple of years back and wonder if there has been any progress.
I have a large library of unsorted music, and another very large library of beets sorted music. I’d like to merge the two by importing the unsorted list however there are a large number of unsorted albums in mp3 which are in my sorted library in FLAC, so obviously I don’t want to replace those.
Basically something like:
do upgrade mp3 to FLAC
do import mp3 if none exist
do import FLAC
don’t import mp3 if FLAC exists
Currently my beets config will replace whatever is in my sorted library with anything in the import folder. I only add FLAC so it’s ok to replace blindly.