Does anyone know of a decent ffmpeg front-end for pulling thumbnails from a video, preferably something with a picker? I googled around and was ultimately unsuccessful.

I have previously used mpv's screenshot command (S) combined with seeking and per frame movements, but it does not correctly handle the video portrait orientation not to mention the interface itself is fairly clumsy.

Ideally I would want to see something that creates a strip a-la Pixel's photo frame extractor where one can select a section of the video and make it extract all the frame or every N'th frame from that section.

I could probably spend a weekend and hack some basic monstrosity in a from of a NodeJS wrapper but that would probably be me trying to invent the wheel, making it square in the process.