{
  "source": "课堂4.mp4",
  "evidence": {
    "430": "camera target position",
    "450": "camera position,target distance969.106,FOV45,film36,f8",
    "780": "distance725/875 black/white linear curve"
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  "stages": [
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      "reopened": true,
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      "target": [
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        "far": 200.0,
        "extrapolate": false
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  ],
  "pending": [
    "camera exposure not shown: native default retained",
    "lighting temporal state",
    "early shadow-light experiment",
    "object curve temporal match",
    "continuous full video review"
  ]
}