{
  "requested_second": 145,
  "exact_baseline_frame": {
    "id": "f4350",
    "source_frame_index": 4350,
    "timestamp_seconds": 145.0,
    "source_pts_seconds": 145.0,
    "timestamp": "145.000000",
    "reasons": [
      "baseline_1fps"
    ],
    "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004350.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-00004350.webp"
  },
  "nearby_frames": [
    {
      "id": "f4333",
      "source_frame_index": 4333,
      "timestamp_seconds": 144.43333333333334,
      "source_pts_seconds": 144.43333333333334,
      "timestamp": "144.433333",
      "reasons": [
        "motion_dense"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004333.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-00004333.webp"
    },
    {
      "id": "f4350",
      "source_frame_index": 4350,
      "timestamp_seconds": 145.0,
      "source_pts_seconds": 145.0,
      "timestamp": "145.000000",
      "reasons": [
        "baseline_1fps"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004350.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-00004350.webp"
    },
    {
      "id": "f4358",
      "source_frame_index": 4358,
      "timestamp_seconds": 145.26666666666668,
      "source_pts_seconds": 145.26666666666668,
      "timestamp": "145.266667",
      "reasons": [
        "scene_context"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004358.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-00004358.webp"
    },
    {
      "id": "f4359",
      "source_frame_index": 4359,
      "timestamp_seconds": 145.3,
      "source_pts_seconds": 145.3,
      "timestamp": "145.300000",
      "reasons": [
        "scene_change",
        "scene_context"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004359.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-00004359.webp"
    },
    {
      "id": "f4369",
      "source_frame_index": 4369,
      "timestamp_seconds": 145.63333333333333,
      "source_pts_seconds": 145.63333333333333,
      "timestamp": "145.633333",
      "reasons": [
        "motion_dense"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004369.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-00004369.webp"
    }
  ],
  "screen_observation": {
    "time": 145.0,
    "source_frame_index": 4350,
    "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"
  ]
}