In most habitats where fritillaries are present, there are multiple look-alike species.

So that makes them hard to identify to species level.

Your late-season, worn individual makes ID even harder.

https://bugguide.net/node/view/23126

^ scroll to "Identification"

Note that the butterfly in your video has inward-pointing chevrons on the margins of the wing.

This is contrary to one of the bugguide key ID points.

You may want to make a list of all the medium-sized fritillaries common to that location and see if there is a more precise match, or just refer to your butterfly as a fritillary.

possibly an Aphrodite Fritillary