Diagnosing audio problems
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Did you check that you have all QtMultimedia plugins installed ?
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Oh, on Unix that would be
PulseAudio (Unix)
Alsa (Unix)That may be the case: FreeBSD comes with OSS and Alsa is optional. I did not have Alsa installed, that may be it. I will install, re-test and reply back.
But I do not understand why Gstreamer is not sufficient if it is Qt's back end for Unix.
And how could KDE sound work if Qt could not detect any audio devices. This simply does not make any sense. -
Depending on your version of KDE, it's phonon that's used.
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Start your application with QT_DEBUG_PLUGINS=1 to see what's going on when your application starts.
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These lines have something to do with audio:
QFactoryLoader::QFactoryLoader() checking directory path "/usr/local/lib/qt5/plugins/audio" ... // there is no audio directory QFactoryLoader::QFactoryLoader() checking directory path "/usr/home/leo/NetBeansProjects/OscilloscopeQT/dist/Debug/GNU-Generic/audio" ... QFactoryLoader::QFactoryLoader() checking directory path "/usr/home/leo/.kde4/lib/kde4/plugins/audio" ... // there is no .kde4/lib QFactoryLoader::QFactoryLoader() checking directory path "/usr/local/lib/kde4/plugins/audio" ... // also no audio directory
Is there a manual on installing the Qt audio plugins under Unix?
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That looks strange, you should check with the FreeBSD guys.
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According to https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208987 multimedia audio plugins cannot be installed from the packages under FreeBSD.
They have to be compiled from the ports tree and select the options to build audio plugins and use ALSA or PA:cd /usr/ports/multimedia/qt5-multimedia make config make deinstall install clean
But still there are no devices recognized after reinstalling with the compiled audio plugins:
QFactoryLoader::QFactoryLoader() checking directory path "/usr/local/lib/qt5/plugins/audio" ... QFactoryLoader::QFactoryLoader() looking at "/usr/local/lib/qt5/plugins/audio/libqtaudio_alsa.so" Found metadata in lib /usr/local/lib/qt5/plugins/audio/libqtaudio_alsa.so, metadata= { "IID": "org.qt-project.qt.audiosystemfactory/5.0", "MetaData": { "Keys": [ "alsa" ] }, "className": "QAlsaPlugin", "debug": false, "version": 328961 } Got keys from plugin meta data ("alsa") QFactoryLoader::QFactoryLoader() checking directory path "/usr/local/lib/kde4/plugins/audio" ... loaded library "/usr/local/lib/qt5/plugins/audio/libqtaudio_alsa.so" Device count: 0 Device count: 0
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What about PA ?