{
  "requested_second": 152,
  "exact_baseline_frame": {
    "id": "f4560",
    "source_frame_index": 4560,
    "timestamp_seconds": 152.0,
    "source_pts_seconds": 152.0,
    "timestamp": "152.000000",
    "reasons": [
      "baseline_1fps"
    ],
    "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004560.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-00004560.webp"
  },
  "nearby_frames": [
    {
      "id": "f4553",
      "source_frame_index": 4553,
      "timestamp_seconds": 151.76666666666668,
      "source_pts_seconds": 151.76666666666668,
      "timestamp": "151.766667",
      "reasons": [
        "motion_dense"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004553.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-00004553.webp"
    },
    {
      "id": "f4560",
      "source_frame_index": 4560,
      "timestamp_seconds": 152.0,
      "source_pts_seconds": 152.0,
      "timestamp": "152.000000",
      "reasons": [
        "baseline_1fps"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004560.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-00004560.webp"
    },
    {
      "id": "f4565",
      "source_frame_index": 4565,
      "timestamp_seconds": 152.16666666666666,
      "source_pts_seconds": 152.16666666666666,
      "timestamp": "152.166667",
      "reasons": [
        "motion_dense"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004565.webp",
      "width": 405,
      "height": 720,
      "selection_reasons": [
        "interval_last",
        "local_motion_4fps"
      ],
      "source_width": 720,
      "source_height": 1280,
      "image_url": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004565.webp"
    },
    {
      "id": "f4569",
      "source_frame_index": 4569,
      "timestamp_seconds": 152.3,
      "source_pts_seconds": 152.3,
      "timestamp": "152.300000",
      "reasons": [
        "motion_dense"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004569.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-00004569.webp"
    },
    {
      "id": "f4573",
      "source_frame_index": 4573,
      "timestamp_seconds": 152.43333333333334,
      "source_pts_seconds": 152.43333333333334,
      "timestamp": "152.433333",
      "reasons": [
        "motion_dense"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004573.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-00004573.webp"
    }
  ],
  "screen_observation": {
    "time": 152.0,
    "source_frame_index": 4560,
    "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": 19,
    "start": 146.033333,
    "end": 153.3,
    "title": "猫咪从桌下靠近镜头",
    "visual_observation": "148秒主要见桌底；149秒猫在较远处出现，150秒靠近，151秒脸变大，152秒面部和胡须已很近。两侧有浅色胳膊状装饰。",
    "camera": "低机位，猫朝镜头运动；原有148–152秒全部采样不变。",
    "uncertainty": "胳膊状装饰不是猫的真实身体结构。",
    "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"
  ]
}