There are several post-installation steps required to actually get a working instance of MediaInfo up and running locally. These include:
- Create a local "Depicts" property with type: item at Special:NewProperty. I kept setting the data type to "property" instead, which causes errors.
- Optional but useful: add the WikibaseImport extension and use it to import entities from Wikidata
It would be good to document these steps in enough detail that a developer who is not super familiar with this project could follow along.