{
  "provenance": "Original authored SVG motion and timeline frames encoded conventionally with FFmpeg; not AI output",
  "scope": "Measured media metadata and decoded boundary fixtures; no perceptual quality or model benchmark",
  "clips": {
    "action-match-comparison": {
      "duration": 6.0,
      "width": 1300,
      "height": 500,
      "frames": 144,
      "frameRate": "24/1",
      "audioTracks": 0
    },
    "split-edit-audio-comparison": {
      "duration": 9.0,
      "width": 960,
      "height": 540,
      "frames": 216,
      "frameRate": "24/1",
      "audioTracks": 1
    }
  },
  "actionBoundary": {
    "outgoingFrame": 71,
    "cutFrame": 72,
    "timeSeconds": 3,
    "matchedIncomingMotionFrame": 72,
    "replayedIncomingMotionFrame": 60
  },
  "splitEditBoundaries": [
    {
      "kind": "sync",
      "picture": 1.5,
      "audio": 1.5
    },
    {
      "kind": "J",
      "picture": 4.5,
      "audio": 4
    },
    {
      "kind": "L",
      "picture": 7.5,
      "audio": 8
    }
  ],
  "decodedActionBoundary": {
    "centroids": {
      "matched-71": {
        "screenX": 321.1819064573556,
        "worldX": 321.1819064573556
      },
      "replayed-71": {
        "screenX": 321.20179085385354,
        "worldX": 321.20179085385354
      },
      "matched-72": {
        "screenX": 283.3151643345265,
        "worldX": 323.79654595323325
      },
      "replayed-72": {
        "screenX": 237.8392009169805,
        "worldX": 291.3137149407004
      }
    },
    "matchedWorldStep": 2.614639495877668,
    "replayedWorldStep": -29.88807591315316,
    "meaning": "The fixture continues forward on the left and repeats earlier motion on the right; it does not prove perceptual seamlessness"
  },
  "decodedAudioChecks": [
    {
      "timeSeconds": 1.25,
      "dominantHz": 220,
      "powerRatio": 10932.3
    },
    {
      "timeSeconds": 1.75,
      "dominantHz": 660,
      "powerRatio": 10862.9
    },
    {
      "timeSeconds": 3.75,
      "dominantHz": 220,
      "powerRatio": 10932.1
    },
    {
      "timeSeconds": 4.25,
      "dominantHz": 660,
      "powerRatio": 10873.9
    },
    {
      "timeSeconds": 7.75,
      "dominantHz": 220,
      "powerRatio": 10964.2
    },
    {
      "timeSeconds": 8.25,
      "dominantHz": 660,
      "powerRatio": 11623.0
    }
  ]
}