{
  "version": 0,
  "output": { "width": 1280, "height": 720, "fps": 30 },
  "source": { "path": "sample.mp4", "proxy": null },
  "cuts": [{ "in": 0.0, "out": 60.0 }],
  "overlays": [],
  "beats": [
    { "id": "b-0001", "t": 3.5, "strength": 0.9, "basis": "kind が無い不正な beat" }
  ]
}