[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": {
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    "wallpaper": "#24125f",
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    "aspectRatio": "16:9",
    "webcamLayoutPreset": "picture-in-picture",
    "webcamMaskShape": "rectangle",
    "webcamMirrored": false,
    "webcamReactiveZoom": true,
    "webcamSizePreset": 25,
    "webcamPosition": null
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  "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"
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}

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