From this now-solved issue we can garner a useful piece of information on locating corrupt files.
Even mp3 files are generally quite large. There shouldn’t be any “tiny” (ie under 10kB or so) mp3 files.
In my case, the problem with ingestion of my library was that some corrupt mp3 files were stalling the process. Probably they failed to copy from their original source and I was left with a tiny garbage file with the right name and extension.
If you are getting the ingestion process sticking, do a search for mp3 files of under 10kB in size. You can safely trash them as virtually no audio file will be that tiny.
With the help of Support I found the first two. Having determined what to look for, I found three more. Removing them allowed my library to be ingested successfully.
Same problem here. Did clean clean install on fresh mac mini. Deleted my libraries and reinstalled Roon and reimported. 57k files are imported, but 0 identified. Rebooted computer and app, but still 0 identified. Using iTunes Media library and ALAC file format from Drobo 5N NAS which hasn’t given me this issue before. I should add that I was able to manually identity and album.
I am on a Macintosh. If you have the library Finder window open you can hit Command-F to search and it will bring up a set of options at the top allowing you to add a whole bunch of criteria including file size and extension to search for.
If you’re running Windows or Linux I’m afraid I don’t know the answer off the top of my head but hopefully someone else will.