QAudioProbe not working anymore

tintin.milou

Hi

I have a problem with QAudioProbe. It doesn't work under Windows 10. I have 4 kits:

Desktop Qt 5.11.1 MinGW 32bit
Desktop Qt 5.11.1 MSVC2015 32bit
Desktop Qt 5.11.1 MSVC2015 64bit
Desktop Qt 5.11.1 MSVC2017 64bit

    m_mediaPlayer = new QMediaPlayer(this);
    m_audioProbe = new QAudioProbe(this);
    connect(m_audioProbe, SIGNAL(audioBufferProbed(QAudioBuffer)), this, SLOT(audioSlot(QAudioBuffer)));
    m_audioProbe->setSource(m_mediaPlayer);
    m_videoWidget = new QVideoWidget;
    m_mediaPlayer->setVideoOutput(m_videoWidget);
    m_videoWidget->show();

    setCentralWidget(m_videoWidget);

    m_mediaPlayer->setMedia(QMediaContent(QUrl::fromLocalFile("C:/blabla/video.avi")));
    m_mediaPlayer->play();

This code gives me this error : "qt.multimedia.plugins.directshow: Failed to connect the audio sample grabber", and the signal is never sent.

QAudioProbe used to work in previous versions of Qt. Is it a bug? How can I fix this problem?

I apologize for my bad English. It is not my mother tongue.

SGaist

Hi and welcome to devnet,

You should start both version of your application with the QT_DEBUG_PLUGINS environment variable set to one to see which plugin is used in both. If it's the same then you may have found a regression.