PRFL: Train 14B Video Generation Models in 67GB VRAM with 56% Smoother Motion

Video-Generation Models Can Also Be the Judge: How PRFL Finetunes a 14 B Model in 67 GB VRAM and Makes Motion 56 % Smoother Train on every frame (720 P × 81) without blowing memory, speed the loop 1.4×, and push motion scores from 25 → 81. All done in latent space—no VAE decoding required. 1. Why a “Judge” Is Missing in Current Video Models People type these questions into search boxes every day: “AI video motion looks fake—how to fix?” “Finetune large video model with limited GPU memory?” “Which method checks physics consistency during generation?” Classic pipelines give a …