Zero GPU Cost and 4-Minute Daily Runs — Making Real Rain Fall on a Still Image with ffmpeg displace

A 30-minute ASMR rain video costs me nothing but electricity, and the daily job that builds it dropped from 7–8 minutes to a little over 4. No video-generation model, no GPU rental, no editing. One still image, a physics simulation of raindrops written in Python, and ffmpeg's displace filter.

Source: [Dev.to](https://dev.to/bokuwalily/zero-gpu-cost-and-4-minute-daily-runs-making-real-rain-fall-on-a-still-image-with-ffmpeg-displace-b5b)