Deterministic Frame-Based Video Rendering
A workflow description for generating videos with Claude Opus 5.5 by treating each frame as a pure function of its index. It uses a fixed canvas, a windowless render engine, and ffmpeg encoding to ensure reproducibility without clock dependencies.
The creative result
Reference prompt
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“Animate an X-ray-style butterfly using a fixed 1000×1080 canvas and frame-number-driven drawing. Build a 720-frame, 12-second loop in which draw(f) gives the same image whenever that frame is requested. Avoid clocks, timers, and unseeded randomness, and bake in the fonts. Render through a headless engine, then encode H.264 with ffmpeg and an explicit pixel aspect ratio. Run the smoke and defect checks, including script errors and text overlap, and compare frame 0 with frame 720 to check the loop seam.”
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