{
  "requested_second": 163,
  "exact_baseline_frame": {
    "id": "f4890",
    "source_frame_index": 4890,
    "timestamp_seconds": 163.0,
    "source_pts_seconds": 163.0,
    "timestamp": "163.000000",
    "reasons": [
      "baseline_1fps",
      "motion_dense",
      "scene_context"
    ],
    "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004890.webp",
    "width": 405,
    "height": 720,
    "selection_reasons": [
      "baseline_1fps_or_last"
    ],
    "source_width": 720,
    "source_height": 1280,
    "image_url": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004890.webp"
  },
  "nearby_frames": [
    {
      "id": "f4881",
      "source_frame_index": 4881,
      "timestamp_seconds": 162.7,
      "source_pts_seconds": 162.7,
      "timestamp": "162.700000",
      "reasons": [
        "scene_change",
        "scene_context"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004881.webp",
      "width": 405,
      "height": 720,
      "selection_reasons": [
        "interval_first",
        "local_motion_4fps"
      ],
      "source_width": 720,
      "source_height": 1280,
      "image_url": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004881.webp"
    },
    {
      "id": "f4888",
      "source_frame_index": 4888,
      "timestamp_seconds": 162.93333333333334,
      "source_pts_seconds": 162.93333333333334,
      "timestamp": "162.933333",
      "reasons": [
        "scene_change",
        "scene_context"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004888.webp",
      "width": 405,
      "height": 720,
      "selection_reasons": [
        "interval_middle",
        "local_motion_4fps"
      ],
      "source_width": 720,
      "source_height": 1280,
      "image_url": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004888.webp"
    },
    {
      "id": "f4890",
      "source_frame_index": 4890,
      "timestamp_seconds": 163.0,
      "source_pts_seconds": 163.0,
      "timestamp": "163.000000",
      "reasons": [
        "baseline_1fps",
        "motion_dense",
        "scene_context"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004890.webp",
      "width": 405,
      "height": 720,
      "selection_reasons": [
        "baseline_1fps_or_last"
      ],
      "source_width": 720,
      "source_height": 1280,
      "image_url": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004890.webp"
    },
    {
      "id": "f4895",
      "source_frame_index": 4895,
      "timestamp_seconds": 163.16666666666666,
      "source_pts_seconds": 163.16666666666666,
      "timestamp": "163.166667",
      "reasons": [
        "scene_context"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004895.webp",
      "width": 405,
      "height": 720,
      "selection_reasons": [
        "interval_last"
      ],
      "source_width": 720,
      "source_height": 1280,
      "image_url": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004895.webp"
    },
    {
      "id": "f4896",
      "source_frame_index": 4896,
      "timestamp_seconds": 163.2,
      "source_pts_seconds": 163.2,
      "timestamp": "163.200000",
      "reasons": [
        "scene_change",
        "scene_context"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004896.webp",
      "width": 405,
      "height": 720,
      "selection_reasons": [
        "interval_first",
        "local_motion_4fps"
      ],
      "source_width": 720,
      "source_height": 1280,
      "image_url": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004896.webp"
    }
  ],
  "screen_observation": {
    "time": 163.0,
    "source_frame_index": 4890,
    "raw_ocr": "再见吧朋友，我就要远航",
    "raw_caption": "再见吧朋友，我就要远航",
    "raw_title": "",
    "screen_caption": "再见吧朋友，我就要远航",
    "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": 21,
    "start": 154.066667,
    "end": 170.4,
    "title": "同一电梯面板的明暗闪烁",
    "visual_observation": "镜头对着电梯控制面板和显示屏，亮暗与彩色灯光反复变化；同一面板位置可对应。画面持续覆盖“再见吧朋友，我就要远航”。",
    "camera": "同一场景内有机位移动及曝光变化。",
    "uncertainty": "覆盖文字不能直接认定为现场人物口述；当前10个残留问题是镜头误报。",
    "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"
  ]
}