{
  "requested_second": 116,
  "exact_baseline_frame": {
    "id": "f3480",
    "source_frame_index": 3480,
    "timestamp_seconds": 116.0,
    "source_pts_seconds": 116.0,
    "timestamp": "116.000000",
    "reasons": [
      "baseline_1fps"
    ],
    "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00003480.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-00003480.webp"
  },
  "nearby_frames": [
    {
      "id": "f3458",
      "source_frame_index": 3458,
      "timestamp_seconds": 115.26666666666667,
      "source_pts_seconds": 115.26666666666667,
      "timestamp": "115.266667",
      "reasons": [
        "motion_dense"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00003458.webp",
      "width": 405,
      "height": 720,
      "selection_reasons": [
        "interval_middle"
      ],
      "source_width": 720,
      "source_height": 1280,
      "image_url": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00003458.webp"
    },
    {
      "id": "f3480",
      "source_frame_index": 3480,
      "timestamp_seconds": 116.0,
      "source_pts_seconds": 116.0,
      "timestamp": "116.000000",
      "reasons": [
        "baseline_1fps"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00003480.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-00003480.webp"
    },
    {
      "id": "f3490",
      "source_frame_index": 3490,
      "timestamp_seconds": 116.33333333333333,
      "source_pts_seconds": 116.33333333333333,
      "timestamp": "116.333333",
      "reasons": [
        "motion_dense"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00003490.webp",
      "width": 405,
      "height": 720,
      "selection_reasons": [
        "local_motion_4fps"
      ],
      "source_width": 720,
      "source_height": 1280,
      "image_url": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00003490.webp"
    },
    {
      "id": "f3498",
      "source_frame_index": 3498,
      "timestamp_seconds": 116.6,
      "source_pts_seconds": 116.6,
      "timestamp": "116.600000",
      "reasons": [
        "motion_dense"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00003498.webp",
      "width": 405,
      "height": 720,
      "selection_reasons": [
        "local_motion_4fps"
      ],
      "source_width": 720,
      "source_height": 1280,
      "image_url": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00003498.webp"
    },
    {
      "id": "f3506",
      "source_frame_index": 3506,
      "timestamp_seconds": 116.86666666666666,
      "source_pts_seconds": 116.86666666666666,
      "timestamp": "116.866667",
      "reasons": [
        "motion_dense"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00003506.webp",
      "width": 405,
      "height": 720,
      "selection_reasons": [
        "local_motion_4fps"
      ],
      "source_width": 720,
      "source_height": 1280,
      "image_url": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00003506.webp"
    }
  ],
  "screen_observation": {
    "time": 116.0,
    "source_frame_index": 3480,
    "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": 10,
    "start": 112.166667,
    "end": 118.3,
    "title": "推子与长发人物后脑",
    "visual_observation": "手持推子靠近长发人物头部，人物朝前坐着；后段头部与头发位置变化。",
    "camera": "近距离手持拍摄。",
    "uncertainty": "随后切至另一长发背影画面，不能保证是同一人物。",
    "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"
  ]
}