{
  "version": 0,
  "output": { "width": 1280, "height": 720, "fps": 30 },
  "source": { "path": "sample.mp4", "proxy": null },
  "cuts": [{ "in": 0, "out": 5 }],
  "overlays": [],
  "timeline": {
    "tracks": [
      { "id": "t1", "kind": "cuts", "ref": -1 },
      { "id": "t2", "kind": "layers", "ref": 1.5 }
    ]
  }
}