Problem Photo (Mac) OCLP

Hi everyone, I have a late 2012 27-inch iMac running Ventura via OCLP.

The Photos app is starting to have problems: it won't recognize some photos, videos only have audio, and previews for photos and especially videos are missing.

I've already rebuilt the library, but to no avail.

How can I best index the 20,000 photos and 759 videos in my library?

Thanks.