{
  "version": 1,
  "output": { "width": 1920, "height": 1080, "fps": 30 },
  "sources": [{ "id": "s1", "path": "sample.mp4", "proxy": null }],
  "cuts": [
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  ],
  "overlays": [],
  "layers": [
    { "id": "l1", "t": 0, "duration": 2, "kind": "baked", "src": "layer.mov", "track": 0 },
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  ],
  "timeline": {
    "tracks": [
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      { "id": "t2", "kind": "layers", "ref": 0 },
      { "id": "t3", "kind": "cuts", "ref": 1 },
      { "id": "t4", "kind": "layers", "ref": 1 }
    ]
  }
}