{
  "version": 0,
  "output": { "width": 1280, "height": 720, "fps": 30 },
  "source": { "path": "sample.mp4", "proxy": null },
  "cuts": [{ "in": 0, "out": 5 }],
  "overlays": [],
  "audio": {
    "bgm": {
      "path": "music.wav",
      "gain_db": -12,
      "keyframes": [
        { "t": 0, "gain_db": 0 },
        { "t": 2, "gain_db": -12, "easing": "in-out-cubic" },
        { "t": 4, "gain_db": 0, "easing": "linear" }
      ]
    },
    "duck_keys": ["narration", "speech"]
  }
}