No Sound Output with QSoundEffect in Qt5.0.2

Question

I want to play a wav file if a singal is emitted. For testing i created a pushButton and filled its slot with

QSoundEffect alarm;
alarm.setSource(QUrl::fromLocalFile("001.wav"));
alarm.setLoopCount(QSoundEffect::Infinite);
alarm.setVolume(1.0f);
alarm.play();

But there is no sound if i click on the pushButton. After searching i found people having the same problem with Qt5 but no solution.

Whats the best and simplest solution with Qt5 to just play an uncompressed sound file (wav) and change its volume?

EDIT: I just found out that it works if i add e.g. a QMessageBox (while this message box is open):

QSoundEffect alarm;
alarm.setSource(QUrl::fromLocalFile("001.wav"));
alarm.setLoopCount(2);
alarm.setVolume(0.5f);
alarm.play();

QMessageBox::information(this, "test", "it works");

Has anybody an explanation for this behaviour?

sudo apt-get install libqt5multimedia5-plugins http://stackoverflow.com/questions/21939759/qaudiodeviceinfo-finds-no-default-audio-device-on-ubuntu — , Jun 02 '16 at 01:49

score 1 · Answer 1 · answered Apr 29 '16 at 12:08

1

for sound need to write event loop, e.g.:

void MainWindow::on_pushButton_4_clicked()
{
    QSoundEffect beep;
    beep.setSource(QUrl("qrc:/sound/beep-02.wav"));
    beep.setVolume(1.0f);
    beep.play();
    QEventLoop loop;
    loop.exec();
}

answered Apr 29 '16 at 12:08

Edward

149
7

score 0 · Answer 2 · edited May 23 '17 at 12:31

0

If you are under Mac OS X you could try this : QT5 QSound does not play all wave files

But the bug has been reported and should be fixed in Qt 5.1.1, so be patient.

edited May 23 '17 at 12:31

Community

1
1

answered Jul 15 '13 at 09:06

Armand

726
11
29

score 0 · Answer 3 · edited Oct 23 '13 at 19:09

0

yea, it's buggie.

I recommend to you to use another Audio Converter.

I used this website and it worked afterwards.

http://www.online-convert.com

edited Oct 23 '13 at 19:09

Josh Crozier

233,099
56
391
304

answered Oct 23 '13 at 18:51

Tower Jimmy

567
1
4
15

Also consider using Audacity for quick conversion. Import all audio files and use "export multiple" feature to generate a set of Wave files that are played flawlessly by `QSoundEffect`. – f4lco Jan 09 '14 at 16:55

score 0 · Answer 4 · answered Nov 15 '14 at 21:55

0

Your QSoundEffect needs a parent to work correctly, actually it works only when you open the messagebox because it will take it as a parent.

answered Nov 15 '14 at 21:55

Boudabiee

1

No Sound Output with QSoundEffect in Qt5.0.2

4 Answers4