I need to convert approximately 15000 FLAC files to MP3 as a one time job.
It is a large audio archive containing 50 years worth of interviews, talks-shows, radio-speeches and monologues belonging to the radio-station I do volunteer work for.
As of 2017 all new stuff is recorded straight in MP3, but we have a huge library of older analog material that got digitized to FLAC in 2018.
(I only got involved later. If I had been there I would have saved everything in both formats from the start.)
I'm looking for a MacOS batch-convert utility (command-line only would be ok too) that is free (this is a short on cash non-profit volunteer organization) and that can do the conversion including the ID3 tags in the FLAC files.
The ID3 metadata is very important to keep: loosing that during the conversion is NOT acceptable.
Typical batch-size would be ideally be 300-400 files in a single run.
Performance (or lack there of) is not a consideration. We have plenty of time.
This is a Mac only outfit, but I'm willing to consider Windows or Linux software if there is nothing available for MacOS. I can setup a VM with Windows or Linux if needed, but I like to avoid that if possible: Our available Macs are aging and not blessed with a lot of RAM.
I've been Googling around but most software seems to be limited use trail-ware that needs payment before it can be used properly. And there is a lot of downloads from dubious sources. Other software seems old and not working on MacOS Catalina at all.
Anybody knows of a good converter?