Qt6 linux: no audio output via QAudioSink

Audetto

Hi, I am porting my app to Qt6 and struggling to make QAudioSink produce any sound.
I am on Ubuntu 24.04, using Qt 6.4.2

After various checks I think the issue is in the default choice of the audio device.

Qt5's default is: alsa_output.pci-0000_00_1b.0.analog-stereo

On Qt6 I can only get one of these

Built-in Audio Analog Stereo
Built-in Audio Digital Stereo (HDMI)

These are the real hardware devices which are already managed by alsa / pulse / pipewire, and cannot be used directly.
Qt5 plays a virtual alsa device which is mixed by the audio system.

How do I do the same in Qt6? I've read about QT_MEDIA_BACKEND=gstreamer or ffmpeg but it makes no difference.

Andrea

SGaist

Hi,

How did you set that environment variable ?