I've been looking for a FOSS desktop agnostic universal file previewer or thumbnail generator for a while now; if anybody has suggestions I'd love to hear them. Ffmpegthumbnailer for video thumbnails or imagemagick for image thumbnails are fine, but what about previews for things like ebooks or PDFs? Something that provides a one-stop-shop for as many common filetypes as possible is what I'm looking for.

My current solution is controlling a floating mpv window to open image, video or audio files as they are selected. This works well for A/V but not so well with other sorts of documents.