{
  "requested_second": 126,
  "exact_baseline_frame": {
    "id": "f3780",
    "source_frame_index": 3780,
    "timestamp_seconds": 126.0,
    "source_pts_seconds": 126.0,
    "timestamp": "126.000000",
    "reasons": [
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    ],
    "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00003780.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-00003780.webp"
  },
  "nearby_frames": [
    {
      "id": "f3778",
      "source_frame_index": 3778,
      "timestamp_seconds": 125.93333333333334,
      "source_pts_seconds": 125.93333333333334,
      "timestamp": "125.933333",
      "reasons": [
        "motion_dense"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00003778.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-00003778.webp"
    },
    {
      "id": "f3780",
      "source_frame_index": 3780,
      "timestamp_seconds": 126.0,
      "source_pts_seconds": 126.0,
      "timestamp": "126.000000",
      "reasons": [
        "baseline_1fps"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00003780.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-00003780.webp"
    },
    {
      "id": "f3782",
      "source_frame_index": 3782,
      "timestamp_seconds": 126.06666666666666,
      "source_pts_seconds": 126.06666666666666,
      "timestamp": "126.066667",
      "reasons": [
        "motion_dense"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00003782.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-00003782.webp"
    },
    {
      "id": "f3790",
      "source_frame_index": 3790,
      "timestamp_seconds": 126.33333333333333,
      "source_pts_seconds": 126.33333333333333,
      "timestamp": "126.333333",
      "reasons": [
        "motion_dense"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00003790.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-00003790.webp"
    },
    {
      "id": "f3798",
      "source_frame_index": 3798,
      "timestamp_seconds": 126.6,
      "source_pts_seconds": 126.6,
      "timestamp": "126.600000",
      "reasons": [
        "motion_dense"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00003798.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-00003798.webp"
    }
  ],
  "screen_observation": {
    "time": 126.0,
    "source_frame_index": 3780,
    "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": 13,
    "start": 121.8,
    "end": 126.933333,
    "title": "黑色门把手与手指操作",
    "visual_observation": "手指在黑色门把手附近按动小部件，随后把手角度改变。",
    "camera": "手持近景。",
    "uncertainty": "不根据外观推断锁具品牌、故障或用途。",
    "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"
  ]
}