Use beets for re-encoding of FLAC library (i.e. for re-compression of files)

[knuurr]

Case: I have an extensive music (mostly FLAC) collection already managed through beets. Most are in FLAC, but small minority is in other lossless format i.e M4A.

Even among FLAC there are differencess in how much simmilar files take space on disk. As example, I have some albums in original and remastered form, and same songs from each album can take 20MB and 100MB.

I suspect compression levels are different among those files.

Question: is it possible, through beets to:

• re-encode (re-compress) all files already in library managed through beets, preferably to best compresison possible?
• bonus points if files inported in lossless format which isn;t FLAC at input would be converted to FLAC (but only lossless, as sometimes I have only lossy source)
• bonus point if it all could be done on the fly - say, if input is album with max compressed FLAC - import, if compression is not max - re-compress and import, and if not FLAC - convert + max compress.

Plugins are ok for me to use if necessary.

I also assume it can also be done through CLI i.e find -exec or simmilar, but won't operation of files circumventing beets interface result in some out of sync scenario between files and DB.