Trying to figure out why I can't upload #webp images to #Mastodon (it just returns 'status=422' and no further logs).

https://github.com/mastodon/mastodon/blob/befbac3f1c54fd850256711327cbd4d24cd8390a/app/controllers/api/v1/media_controller.rb#L13 points to an issue with Paperclip.

Then a bit of search, https://github.com/thoughtbot/paperclip/blob/c769382c9b7078f3d1620b50ec2a70e91ba62ec4/lib/paperclip/geometry_detector_factory.rb#L21 tells me the command that gets run.

Finally trying it out on a sample image:

$ identify -format '%wx%h,%[exif:orientation]' image.webp
identify-im6.q16: unknown image property "%[exif:orientation]" @ warning/property.c/InterpretImageProperties/4011.