[Bug]: No Sound on export

[Plexusgel]

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Describe the bug

I have a quicktime video (macOS system capture) with sound recorded in and when exporting to mp4 the output video has no sound in it

Expected behavior

The video should contain sound. There is sound when playing back the video inside the editor

To Reproduce

Be on macOS
open a Quicktime video with OpenScreen, that has sound in it
export it
get no sound

Screenshots

No response

OS

macOS

OS Version

Tahoe 26.4.1

Other OS

No response

Browser

Other

Browser Version

Zen 1.19.11b (Firefox 150.0.1)

Other Browser

Zen

Device Type

Desktop

Other Device

No response

Additional context

No response

[siddharthvaddem]

https://github.com/siddharthvaddem/openscreen/actions/runs/24947370830

could you try using this pre-release version and checking if the issue still persists? This should be a signed app so you will not need to run the quarantine command

[RaunakKochar]

@siddharthvaddem
It looks like MP4 export is using Opus audio, which causes no-audio playback in some MP4 players. I think the app should switch MP4 audio export from Opus to AAC in the exporter path (src/lib/exporter/muxer.ts and src/lib/exporter/audioEncoder.ts), or use a different container when keeping Opus.

[Plexusgel]

It now works as expected using this pre-release version, thank you