How I Used GPT-4o to Score Video Clips for Virality (With Prompt Engineering)

Picking which 60 seconds of a 30-minute YouTube video will go viral is a hard problem. Human editors spend years developing the intuition for it. I spent a few weeks trying to compress that intuition into a GPT-4o prompt — and it actually works well enough for production use. This article walks through the exact prompt engineering approach, the scoring schema, and the Node.js implementation I use in the pipeline behind ClipSpeedAI. The Problem With Naive Clip Selection The obvious a