{
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  "output": { "width": 1920, "height": 1080, "fps": 30 },
  "sources": [],
  "tracks": [
    {
      "id": "captions",
      "lane": "visual",
      "items": [
        {
          "id": "captions",
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          "duration": 60,
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              "amount": { "y": 24, "opacity": -1 } }
          ],
          "keyframes": [
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          "items": []
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  ]
}