{
  "requested_second": 141,
  "exact_baseline_frame": {
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    "source_frame_index": 4230,
    "timestamp_seconds": 141.0,
    "source_pts_seconds": 141.0,
    "timestamp": "141.000000",
    "reasons": [
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    "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004230.webp",
    "width": 405,
    "height": 720,
    "selection_reasons": [
      "baseline_1fps_or_last",
      "local_motion_4fps"
    ],
    "source_width": 720,
    "source_height": 1280,
    "image_url": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004230.webp"
  },
  "nearby_frames": [
    {
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      "source_frame_index": 4217,
      "timestamp_seconds": 140.56666666666666,
      "source_pts_seconds": 140.56666666666666,
      "timestamp": "140.566667",
      "reasons": [
        "motion_dense"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004217.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-00004217.webp"
    },
    {
      "id": "f4225",
      "source_frame_index": 4225,
      "timestamp_seconds": 140.83333333333334,
      "source_pts_seconds": 140.83333333333334,
      "timestamp": "140.833333",
      "reasons": [
        "motion_dense"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004225.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-00004225.webp"
    },
    {
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      "source_frame_index": 4230,
      "timestamp_seconds": 141.0,
      "source_pts_seconds": 141.0,
      "timestamp": "141.000000",
      "reasons": [
        "baseline_1fps"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004230.webp",
      "width": 405,
      "height": 720,
      "selection_reasons": [
        "baseline_1fps_or_last",
        "local_motion_4fps"
      ],
      "source_width": 720,
      "source_height": 1280,
      "image_url": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004230.webp"
    },
    {
      "id": "f4237",
      "source_frame_index": 4237,
      "timestamp_seconds": 141.23333333333332,
      "source_pts_seconds": 141.23333333333332,
      "timestamp": "141.233333",
      "reasons": [
        "motion_dense"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004237.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-00004237.webp"
    },
    {
      "id": "f4245",
      "source_frame_index": 4245,
      "timestamp_seconds": 141.5,
      "source_pts_seconds": 141.5,
      "timestamp": "141.500000",
      "reasons": [
        "motion_dense"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004245.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-00004245.webp"
    }
  ],
  "screen_observation": {
    "time": 141.0,
    "source_frame_index": 4230,
    "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": 17,
    "start": 138.233333,
    "end": 145.3,
    "title": "炒锅内浅色食物与抖锅",
    "visual_observation": "手握炒锅柄抖动锅体；浅色食物先在锅内可见，后段锅内为空。",
    "camera": "手腕与锅体连续运动，机位接近灶台。",
    "uncertainty": "食物最终落点未从现有代表图确认，不凭空补写。",
    "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"
  ]
}