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  "output": { "width": 1920, "height": 1080, "fps": 30 },
  "sources": [{ "id": "s1", "path": "sample.mp4", "proxy": null }],
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  ],
  "overlays": [],
  "layers": [
    { "id": "l1", "t": 0, "duration": 3, "kind": "baked", "src": "layer.mov", "track": 1 }
  ],
  "audio": { "sfx": [{ "path": "sfx.wav", "t": 1, "track": 2 }] },
  "tracks": {
    "cuts": [{ "muted": false, "hidden": false }, { "hidden": true }],
    "layers": [{}, { "muted": true }],
    "audio": [{}, {}, { "muted": true }]
  }
}