

I feel sick saying it, but I think this is a project you could complete with AI. It sucks ass at understanding complex problems, but it’s good at cranking out small scripts to integrate tools together.
You basically just want a wrapper around ffmpeg with a light web interface to handle upload, script execution, and download.
LLMs are pretty good at spitting out a simple web interface that runs in a barebones server like Express or nginx.
If you don’t need to worry about security or accessibility or any “not on the critical path” concerns, this could probably work after a few iterations.
As for anything already out there - I’ve never come across anything. The closest app I can think of is TDARR which is intended to automatically transcode your media library to h265. That wraps up some of the ffmpeg stuff you want, but doesn’t address the upload/download half of the workflow.
It’s reasonable to have a store provide a service where an employee processes the customer’s items to check for damage, verify prices, and bag them intelligently.
But it’s not worth the risk of getting the wrong chatty cashier.
No, I’ll roll the dice and scan them myself. If I hit an “unexpected item in bagging area” error that requires someone to come over and help me, I can always burn down the store and run away and try again somewhere else.