Audio issue with multiple inputs on the same source (OBS 30.1.2, Flatpak, PipeWire)

[guilhem]

When using multiple audio inputs on the same audio source in OBS, the sound quality becomes extremely poor and choppy. This issue occurs with my main "mic" input muted and another "audio input capture (pulseaudio)" on the same default audio source. When the "mic" input is redirected to another arbitrary source, the audio quality significantly improves. This issue is observed on OBS version 30.1.2 installed via Flatpak, using PipeWire for audio management.

Operating System Info

Other

Other OS

Ubuntu 24.04

OBS Studio Version

30.1.2

OBS Studio Version (Other)

No response

OBS Studio Log URL

https://obsproject.com/logs/FEDqOVF67OAVZP9I

OBS Studio Crash Log URL

No response

Expected Behavior

The audio quality should remain consistent and clear regardless of the number of inputs on the same audio source.

Current Behavior

The audio becomes extremely poor and choppy when multiple inputs are added to the same audio source. Redirecting the "mic" input to another source resolves the issue and the audio quality improves.

Steps to Reproduce

1. Install OBS version 30.1.2 via Flatpak.
2. Configure PipeWire as the audio backend.
3. Add a "mic" input and an "audio input capture (pulseaudio)" to the same audio source (default).
4. Mute the "mic" input.
5. Observe the audio quality.

Anything else we should know?

sound example https://github.com/obsproject/obs-studio/assets/486876/d22fa1e6-8ab6-4d5d-9968-7af279d26fd5