QAudioDeviceInfo finds no default audio device on Ubuntu

Question

I am trying to run the basic example from the QAudioDeviceInfo class reference, but Qt is not finding a default audio device.

Running this code shows no output:

foreach (const QAudioDeviceInfo &deviceInfo,  QAudioDeviceInfo::availableDevices(QAudio::AudioOutput))
    qDebug() << "Device name: " << deviceInfo.deviceName();

I'm running Qt Creator 2.7.1 with Qt 5.0.2 on Ubuntu 13.10. Qt Multimedia was installed via apt-get. My pro file has QT += multimedia. My header file includes:

#include <QAudio>
#include <QAudioOutput>
#include <QAudioDeviceInfo>

Any ideas as to what I might be doing wrong?

I found the fix for my answer, although apparently I can't answer my own question until tomorrow. I just had to run: `sudo apt-get install libqt5multimedia5-plugins` — maxmcmahon, Feb 21 '14 at 19:46

score 18 · Answer 1 · answered Feb 26 '14 at 16:08

18

It was fixed with a simple command:

sudo apt-get install libqt5multimedia5-plugins

Qt Multimedia requires this plugin package for audio backend support.

answered Feb 26 '14 at 16:08

maxmcmahon

445
3
8

1

For OS X deployment, this is the `plugins/audio/libqtaudio_coreaudio.dylib` file. – njahnke Jun 05 '14 at 00:14
This is also true for Ubuntu 14.04 – JoErNanO Sep 18 '14 at 08:30
Solved also my problem with PyQt5 on Ubuntu 14.04 :) – iacopo Dec 07 '14 at 22:58

score 3 · Answer 2 · answered Jun 12 '14 at 11:29

3

Had same issue in windows. Fixed it by replacing Qt5Multimedia.dll in \Python34\Lib\site-packages\PyQt* with one from \Qt\Tools\QtCreator\bin.

Spend some time finding solution so decided to leave it here.

answered Jun 12 '14 at 11:29

user3733855

31
1

QAudioDeviceInfo finds no default audio device on Ubuntu

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