[Bug]: Export fails to export audio

[barnaclebarnes]

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Describe the bug

1. I record a video with mic audio and webcam video, also creen audio
2. I check the recording in there UI, audio plays
3. I export the video to mp4
4. The exported file has no audio

Expected behavior

It should export with audio.

To Reproduce

1. I record a video with mic audio and webcam video, also creen audio
2. I check the recording in there UI, audio plays
3. I export the video to mp4
4. The exported file has no audio

Screenshots

{
  "timestamp": "2026-07-17T03:03:38.225Z",
  "appVersion": "1.6.0-rc.1",
  "platform": "darwin",
  "arch": "arm64",
  "osRelease": "25.5.0",
  "osVersion": "Darwin Kernel Version 25.5.0: Mon Apr 27 20:41:26 PDT 2026; root:xnu-12377.121.6~2/RELEASE_ARM64_T8132",
  "totalMemoryMB": 32768,
  "nodeVersion": "24.14.1",
  "electronVersion": "41.2.1",
  "chromeVersion": "146.0.7680.188",
  "error": "Manual diagnostic export",
  "projectState": {
    "zoomRegions": [
      {
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      {
        "id": "zoom-7",
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        "depth": 3,
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          "cy": 0.5829749103942652
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      {
        "id": "zoom-9",
        "startMs": 85231,
        "endMs": 91878,
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        "customScale": 1.8,
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      {
        "id": "zoom-10",
        "startMs": 35474,
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    ],
    "autoZoomEnabled": true,
    "autoFocusAll": false,
    "trimRegions": [],
    "speedRegions": [],
    "annotationRegions": [],
    "cropRegion": {
      "x": 0,
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    "wallpaper": "#24125f",
    "shadowIntensity": 0,
    "showBlur": false,
    "showTrimWaveform": true,
    "motionBlurAmount": 0,
    "borderRadius": 0,
    "padding": 50,
    "aspectRatio": "16:9",
    "webcamLayoutPreset": "picture-in-picture",
    "webcamMaskShape": "rectangle",
    "webcamMirrored": false,
    "webcamReactiveZoom": true,
    "webcamSizePreset": 25,
    "webcamPosition": null
  },
  "recentLogs": [],
  "helperOutput": {
    "windows": "",
    "mac": "{\"schemaVersion\":1,\"event\":\"ready\"}\n{\"event\":\"recording-started\",\"timestampMs\":1784256425942,\"captureBounds\":{\"width\":1920,\"y\":0,\"height\":1080,\"x\":0},\"height\":1080,\"width\":1920}\n{\"event\":\"recording-stopped\",\"screenPath\":\"\\/Users\\/barnaclebarnes\\/Library\\/Application Support\\/openscreen\\/recordings\\/recording-1784256424964.mp4\"}\n"
  },
  "mainProcessLogs": []
}

OS

macOS

OS Version

26.5.1

Other OS

No response

Browser

None

Browser Version

No response

Other Browser

No response

Device Type

Desktop

Other Device

No response

Additional context

No response

[github-actions]

Fixed by #109 and merged into main.

This change is assigned to the Next Release release milestone and is not necessarily available in the latest downloadable desktop release yet. It is currently marked as status: pending release until a packaged release containing it is published.

[EtienneLescot]

Moved into v1.7.0 as part of the pre-release cut.