A recent topic appeared on Extension talk:CirrusSearch. The suggestion is to expose file metadata already available via the API to the search engine.
- Video or audio of a certain "playtime"
- Looped images
- Frame rate,
- creation date
The example use case given: "The usecases are numerous, for instance for writing an article about world war one, one may want to filter images from that period. When looking for videos to add to a page one may want short animations to showcase the concept, e.g. a moving hurricane , and not be interested in very long videos. The same applies to animated images because in some cases they illustrate the concept better than others, and in some cases they don't, so it might be good to filter those either way."
Also mentioned were fields from the Commons Metadata API
- GPSLatitude - latitude
- GPSLongitude - longitude
- LicenseShortName - short human-readable license name