{
  "requested_second": 165,
  "exact_baseline_frame": {
    "id": "f4950",
    "source_frame_index": 4950,
    "timestamp_seconds": 165.0,
    "source_pts_seconds": 165.0,
    "timestamp": "165.000000",
    "reasons": [
      "baseline_1fps",
      "motion_dense"
    ],
    "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004950.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-00004950.webp"
  },
  "nearby_frames": [
    {
      "id": "f4939",
      "source_frame_index": 4939,
      "timestamp_seconds": 164.63333333333333,
      "source_pts_seconds": 164.63333333333333,
      "timestamp": "164.633333",
      "reasons": [
        "scene_context"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004939.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-00004939.webp"
    },
    {
      "id": "f4945",
      "source_frame_index": 4945,
      "timestamp_seconds": 164.83333333333334,
      "source_pts_seconds": 164.83333333333334,
      "timestamp": "164.833333",
      "reasons": [
        "scene_change",
        "scene_context"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004945.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-00004945.webp"
    },
    {
      "id": "f4946",
      "source_frame_index": 4946,
      "timestamp_seconds": 164.86666666666667,
      "source_pts_seconds": 164.86666666666667,
      "timestamp": "164.866667",
      "reasons": [
        "motion_dense",
        "scene_context"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004946.webp",
      "width": 405,
      "height": 720,
      "selection_reasons": [
        "interval_first"
      ],
      "source_width": 720,
      "source_height": 1280,
      "image_url": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004946.webp"
    },
    {
      "id": "f4950",
      "source_frame_index": 4950,
      "timestamp_seconds": 165.0,
      "source_pts_seconds": 165.0,
      "timestamp": "165.000000",
      "reasons": [
        "baseline_1fps",
        "motion_dense"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004950.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-00004950.webp"
    },
    {
      "id": "f4961",
      "source_frame_index": 4961,
      "timestamp_seconds": 165.36666666666667,
      "source_pts_seconds": 165.36666666666667,
      "timestamp": "165.366667",
      "reasons": [
        "scene_change",
        "scene_context"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004961.webp",
      "width": 405,
      "height": 720,
      "selection_reasons": [
        "uncertain_change_evidence"
      ],
      "source_width": 720,
      "source_height": 1280,
      "image_url": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004961.webp"
    }
  ],
  "screen_observation": {
    "time": 165.0,
    "source_frame_index": 4950,
    "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"
  ]
}