allenk/VeoWatermarkRemover — reverse-engineered prompt

Build me a small offline command line app that removes Google Veo and Gemini video watermarks from local video files. It should automatically detect whether the clip has the small Veo text in the bottom right or the Gemini diamond watermark, and clean the right one without me having to set it up. I want the actual removal to use precise reverse alpha blending math, not generative fill or made up pixels, so the result stays natural and does not blur the whole frame.

Please make it work on common desktop systems, with the current demo focused on a simple command line flow. It should handle landscape and portrait videos, try to pick the right removal intensity on its own for each clip, stay fully local with no uploads, and keep the output video timing and general quality intact. If auto detection fails on some harder 720p clips, give me a simple manual override. Add clear messages for skipped or unsupported files, and a short help screen with examples. You can look up current docs online if you need to.