Every clip below was authored as a JSON scene, checked for pixel collisions by the validator, then rendered to MP4. They autoplay and loop. Click a clip to replay or scrub.
All built free, on this machine, no editor.
1. A scene is described as JSON (every element has an exact pixel box). 2. The validator guarantees nothing collides and arrows point true - it blocks a broken layout. 3. Python computes every animation frame and ffmpeg stitches them into MP4. Deterministic: same input, same video.
To make a clip from your own content: send one screenshot + a hook line, and I build a validated scene from it.
If a video doesn't autoplay, click it. Files live in the out/ folder next to this page.