{
  "requested_second": 174,
  "exact_baseline_frame": {
    "id": "f5220",
    "source_frame_index": 5220,
    "timestamp_seconds": 174.0,
    "source_pts_seconds": 174.0,
    "timestamp": "174.000000",
    "reasons": [
      "baseline_1fps",
      "motion_dense",
      "scene_context"
    ],
    "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00005220.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-00005220.webp"
  },
  "nearby_frames": [
    {
      "id": "f5196",
      "source_frame_index": 5196,
      "timestamp_seconds": 173.2,
      "source_pts_seconds": 173.2,
      "timestamp": "173.200000",
      "reasons": [
        "motion_dense",
        "scene_change",
        "scene_context"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00005196.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-00005196.webp"
    },
    {
      "id": "f5208",
      "source_frame_index": 5208,
      "timestamp_seconds": 173.6,
      "source_pts_seconds": 173.6,
      "timestamp": "173.600000",
      "reasons": [
        "motion_dense"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00005208.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-00005208.webp"
    },
    {
      "id": "f5216",
      "source_frame_index": 5216,
      "timestamp_seconds": 173.86666666666667,
      "source_pts_seconds": 173.86666666666667,
      "timestamp": "173.866667",
      "reasons": [
        "motion_dense",
        "scene_context"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00005216.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-00005216.webp"
    },
    {
      "id": "f5217",
      "source_frame_index": 5217,
      "timestamp_seconds": 173.9,
      "source_pts_seconds": 173.9,
      "timestamp": "173.900000",
      "reasons": [
        "scene_change",
        "scene_context"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00005217.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-00005217.webp"
    },
    {
      "id": "f5220",
      "source_frame_index": 5220,
      "timestamp_seconds": 174.0,
      "source_pts_seconds": 174.0,
      "timestamp": "174.000000",
      "reasons": [
        "baseline_1fps",
        "motion_dense",
        "scene_context"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00005220.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-00005220.webp"
    }
  ],
  "screen_observation": {
    "time": 174.0,
    "source_frame_index": 5220,
    "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": [
    {
      "start": 173.08,
      "end": 174.5,
      "text": "Woo",
      "confidence": {
        "no_speech_prob": 7.860118111935321e-11,
        "avg_logprob": -0.45995079387318005
      }
    }
  ],
  "content_section": {
    "index": 25,
    "start": 173.9,
    "end": 177.7,
    "title": "人物静态肖像",
    "visual_observation": "男子正面肖像，深色外套，背景较纯。",
    "camera": "静态图片。",
    "uncertainty": "不能因背景声轨有人声就认定肖像人物正在讲话。",
    "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"
  ]
}