https://bugs.kde.org/show_bug.cgi?id=520590
Bug ID: 520590
Summary: [plasma-camera] No audio devices found for recording
on Wayland/PipeWire with Qt 6.10
Classification: Applications
Product: Kamera
Version First unspecified
Reported In:
Platform: Ubuntu
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: General
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
---
Version: plasma-camera 2.1.1-2build1
System: Ubuntu 26.04, KDE Plasma, Wayland, PipeWire
Qt: 6.10.2
---
I published this bug here since I couldn't find the category for the
plasma-camera application anywhere
Bug:
plasma-camera reports "No audio devices found for recording" even though
PipeWire correctly exposes audio input devices via Qt Multimedia.
Steps to reproduce:
simply open plasma-camera, register a video and open the generated video file.
There will be no audio.
Root cause in `plasmacameramanager.cpp`, `findAndSetDefaultRecordingDevice()`:
```cpp
for (const QAudioDevice &device : QMediaDevices::audioInputs()) {
if (device.isDefault() && device.mode() == QAudioDevice::Input) {
audioDevice = device;
}
}
```
Qt Multimedia lists the devices correctly (confirmed via QT_LOGGING_RULES),
but device.isDefault() returns false for all devices under Qt 6.10 + PipeWire,
so audioDevice remains null and recording fails.
Additionally: the .desktop file is missing from the package, causing portal
registration to fail ("App info not found for 'org.kde.plasma-camera'").
Workaround: plasma-camera --desktop-file-name=org.kde.plasma-camera
Fix for the audio bug:
```cpp
for (const QAudioDevice &device : QMediaDevices::audioInputs()) {
if (device.isDefault()) {
audioDevice = device;
break;
}
}
if (audioDevice.isNull() && !QMediaDevices::audioInputs().isEmpty()) {
audioDevice = QMediaDevices::audioInputs().first();
}
```
With this fix applied and recompiled, audio recording works correctly.
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