How Text-to-Image and Video Diffusion Models Work
3Blue1Brown · Explainer · 37 min · 2025 · YouTube title: But how do AI images and videos actually work? | Guest video by Welch Labs
Why it's here
HN uses it as a clear explainer for diffusion mechanics, such as negative prompts and faster sampling, and for joint text-image encoders.
What it covers
A guest video by Welch Labs on 3Blue1Brown explaining how text-to-image and video models work. It covers CLIP, shared embedding spaces, diffusion models (DDPM, DDIM), conditioning, guidance and negative prompts.