Over the weekend, for the fal × Sequoia 72h Video Hackathon, I built a short AI film set to Edvard Grieg's In the Hall of the Mountain King.
Story
A trespasser enters a living mineral hall. As the theme repeats and speeds up, the cave wakes: walls breathe, stone ripples, crystal corridors rearrange. In the climax, he is pulled into the rock itself — and the mountain was the creature all along.
Process
- Analyzed the music (tempo, onsets, bars, percussion hits, and accelerando), then built an adaptive beat grid so every cut and transition is locked to the music.
- Style lock with stills first (realistic materials + one impossible twist per shot).
- Keyframes in Seedream 5.0 Pro.
- Animation in Seedance 2.0.
- Continuity via handoff frames (last frame of one shot → first frame of the next).
- Character workaround for likeness blocks: bake identity into a single still, then animate only that image.