{
  "version": 1,
  "size": 2010887,
  "mtime_ns": 1788920191029677867,
  "duration": 4.4,
  "note": "No clear motion in 2.0s probes — stills every 2.0s. A short train can sit between them; watch the clip if it looks empty.",
  "suggest": null,
  "frames": [
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      "file": "000_00000.jpg",
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    {
      "t": 4.0,
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