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motion-design-video-analysis

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Reverse-engineer a short motion-design / product-update video (animation technique, timing and easing, composition, transitions, likely tooling, vibe, audio) and produce a rebuild spec someone can build from. Default path is one call to google/gemini-3.8-flash over sampled frames, then a mandatory by-eye check of every claim. Use when asked how a marketing or product video was made, what its vibe is, or before replicating one (then continue with motion-design-replication).

templates/community/open-prompt-showreel/skills/motion-design-video-analysis/SKILL.md

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Nov 12, 2026
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# Motion-design video analysis

Turns a short (under ~1 min) motion-design clip into two things: an **analysis** (how it was made and how it feels) and a **rebuild spec** (numbers someone can build from without reopening the video). Validated on a 28.6 s product-update clip (Linear's "Loops updates") and reused as the judge on a replica of it.

The model is a fast first reader. You are the ground truth. Both models tested on the Linear clip confidently described a "flat 2D view that becomes 3D at 7.5s"; the frames show a 3D scene from t=0. Plan for that class of error.

## Prerequisites

- `ffmpeg` on PATH. Worker images have a full static build at `/usr/local/bin/ffmpeg` (has `fps`, `tile`, `scale`, `crop`, `hstack`; no `drawtext`, no `ffprobe`: read `ffmpeg -i` stderr, or run the community template's `setup.sh` to add ffprobe). The Remotion-bundled ffmpeg under `node_modules/@remotion/compositor-*` is stripped (no `fps`, `tile` or `hstack`); don't use it for analysis.
- Pixel maths: `python3 -m venv /tmp/venv && /tmp/venv/bin/pip install numpy pillow` (system pip is blocked by PEP 668; this venv install was run and works).
[Credential-related source omitted]
- Getting bytes off agent-fs: `agent-fs download <path> -o <file>`. Viewer URLs serve an SPA shell, not the file; use `agent-fs signed-url <path> --json` when a script needs to fetch it. Upload binaries with `agent-fs write <path> --file <local>` (binary-safe).

## Step 1 — probe the file
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