I work with small film collections: amateur reels, wedding films from the seventies, a travelling cinema projectionist's diary. Everybody has a shelf of boxes and nobody has the metadata.
Proposal: a simple, open record format for a film item: title as written on the box, language, approximate year, place, who is visible (only with consent), and an honest condition note. Records are signed by the archivist, and can be corrected in public with a visible history.
We do not collect the films here, only the knowledge about them. Interested? Also, anyone who has a projector, please say so, mine overheats.