{
  "date": "2026-11-08 Asia/Tokyo",
  "status": "INPUT VERIFICATION ONLY; actual browser repair NOT RUN",
  "question": "Does video watermark repair keep a second selectable audio track?",
  "method": "Two new files containing two separate AAC mono streams, not one stereo stream; each explicitly decoded without downmix. Only default disposition changes between controls. All72 video counters verified.",
  "inputs": [
    {
      "file": "default-A.mp4",
      "bytes": 102646,
      "sha256": "6278f9a19d3abc33cb3be4f93c9d0b4dc272999eb9b22cf6e28d14769faaac2a",
      "dimensions": [
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      "decodedVideoFrames": 72,
      "frameCounters": [
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      "defaultTrack": "A",
      "separateAudioStreams": [
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          "sourceStreamIndex": 1,
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          "channels": 1,
          "sampleRate": 48000,
          "decodedSamples": 144384,
          "decodedSeconds": 3.008,
          "durationFormula": "decodedSamples/sampleRate",
          "windowSamples": [
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          ],
          "windowRMS": 0.17683297077472884,
          "rmsFormula": "sqrt(sum(x^2)/N)",
          "dominantHz": 440.0,
          "dominantMethod": "largest magnitude of Hann-windowed FFT, N48000, sampleRate48000 =>1Hz bins",
          "languageTag": "eng",
          "languageNote": "Fixture metadata only; generated tones, no speech",
          "default": true
        },
        {
          "audioIndex": 1,
          "sourceStreamIndex": 2,
          "metadataLine": "Stream #0:2[0x3](zho): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 96 kb/s",
          "channels": 1,
          "sampleRate": 48000,
          "decodedSamples": 144384,
          "decodedSeconds": 3.008,
          "durationFormula": "decodedSamples/sampleRate",
          "windowSamples": [
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          "windowRMS": 0.17739503524552894,
          "rmsFormula": "sqrt(sum(x^2)/N)",
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          "dominantMethod": "largest magnitude of Hann-windowed FFT, N48000, sampleRate48000 =>1Hz bins",
          "languageTag": "zho",
          "languageNote": "Fixture metadata only; generated tones, no speech",
          "default": false
        }
      ],
      "fullDecodeExit": 0
    },
    {
      "file": "default-B.mp4",
      "bytes": 102646,
      "sha256": "91b72fa7257a6efe93a872c739e8467edfd72dfe6fafd4fbf747b838f3a3cb7e",
      "dimensions": [
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      ],
      "decodedVideoFrames": 72,
      "frameCounters": [
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      "defaultTrack": "B",
      "separateAudioStreams": [
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          "audioIndex": 0,
          "sourceStreamIndex": 1,
          "metadataLine": "Stream #0:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 96 kb/s",
          "channels": 1,
          "sampleRate": 48000,
          "decodedSamples": 144384,
          "decodedSeconds": 3.008,
          "durationFormula": "decodedSamples/sampleRate",
          "windowSamples": [
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          ],
          "windowRMS": 0.17683297077472884,
          "rmsFormula": "sqrt(sum(x^2)/N)",
          "dominantHz": 440.0,
          "dominantMethod": "largest magnitude of Hann-windowed FFT, N48000, sampleRate48000 =>1Hz bins",
          "languageTag": "eng",
          "languageNote": "Fixture metadata only; generated tones, no speech",
          "default": false
        },
        {
          "audioIndex": 1,
          "sourceStreamIndex": 2,
          "metadataLine": "Stream #0:2[0x3](zho): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 96 kb/s (default)",
          "channels": 1,
          "sampleRate": 48000,
          "decodedSamples": 144384,
          "decodedSeconds": 3.008,
          "durationFormula": "decodedSamples/sampleRate",
          "windowSamples": [
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          "windowRMS": 0.17739503524552894,
          "rmsFormula": "sqrt(sum(x^2)/N)",
          "dominantHz": 880.0,
          "dominantMethod": "largest magnitude of Hann-windowed FFT, N48000, sampleRate48000 =>1Hz bins",
          "languageTag": "zho",
          "languageNote": "Fixture metadata only; generated tones, no speech",
          "default": true
        }
      ],
      "fullDecodeExit": 0
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  ],
  "plannedBox": {
    "x": 318,
    "y": 105,
    "width": 91,
    "height": 38,
    "start": 0,
    "end": 3,
    "zone2": false
  },
  "note": "A default flag/stream label does not establish actual browser selection or exported preservation. No saved output exists."
}