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      "width": 405,
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      "source_height": 1280,
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  "screen_observation": {
    "time": 109.0,
    "source_frame_index": 3270,
    "raw_ocr": "",
    "raw_caption": "",
    "raw_title": "",
    "screen_caption": "",
    "screen_title": "",
    "reviewed_changes": [],
    "verification": "automatic OCR; not independently verified",
    "timing": "observed frame time; onset/offset not known to subsecond precision",
    "is_confirmed_speech": false
  },
  "raw_ASR_at_estimated_time": [],
  "content_section": {
    "index": 8,
    "start": 105.533333,
    "end": 111.433333,
    "title": "锅中肉块与地板",
    "visual_observation": "锅中有肉块，镜头从灶台转向冰箱与地板，地板上出现肉块；后续锅中再次有肉块并回到灶台。",
    "camera": "第一视角抖锅、下俯与转回，过程较快。",
    "uncertainty": "落地和回锅的具体手法需要连续预览；不把不同位置静帧误当独立场景。",
    "provenance": "assistant visual review of source-frame sheets; not an independent human or automatic semantic-model benchmark"
  },
  "unknowns": [
    "ASR not a verified listening transcript",
    "Caption display time can differ from speech time",
    "Assistant observation must be cross-checked by actually opening image"
  ]
}