QTextToSpeech fails sporadically

ollax452

Hi!
I have compiled the hello_speak example from Qt on my Rpi3 with qt5.15.2. The available languages/voices seem not be loaded correctly (sporadically). I don't get any lanugages, voices sometimes, and sometimes it works. Please, can someone look at this, I have done fault finding a long time now :)

I have enabled the QT_DEBUG_PLUGINS and its seems like only one plugin is loaded: libqttexttospeech_flite or libqtexttospeech_speechd. And it changes between those two every run. Why is not both loaded every time?

My pro file looks as following (the rest of the code is the same as for the hello_speak
example):

QT       += core gui
QT       += multimedia
QT       += texttospeech

SOURCES = main.cpp \
          mainwindow.cpp
HEADERS = mainwindow.h

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TEMPLATE = app

FORMS = mainwindow.ui

I have added the QT_DEBUG_PLUGINS and the only difference between a 'good' start and a 'bad' start is the following:
loaded library "/opt/Qt/5.15.2/plugins/texttospeech/libqtexttospeech_speechd.so"
vs
loaded library "/opt/Qt/5.15.2/plugins/texttospeech/libqttexttospeech_flite.so"

Why is not both plugins loaded? Here is the total output from the QT_DEBUG_PLUGINS when libqtexttospeech_speechd is loaded:

10:21:10: Debugging starts
QFactoryLoader::QFactoryLoader() checking directory path "/opt/Qt/5.15.2/plugins/platforms" ...
QFactoryLoader::QFactoryLoader() looking at "/opt/Qt/5.15.2/plugins/platforms/libqeglfs.so"
Found metadata in lib /opt/Qt/5.15.2/plugins/platforms/libqeglfs.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "eglfs"
        ]
    },
    "archreq": 0,
    "className": "QEglFSIntegrationPlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("eglfs")
QFactoryLoader::QFactoryLoader() looking at "/opt/Qt/5.15.2/plugins/platforms/libqlinuxfb.so"
Found metadata in lib /opt/Qt/5.15.2/plugins/platforms/libqlinuxfb.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "linuxfb"
        ]
    },
    "archreq": 0,
    "className": "QLinuxFbIntegrationPlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("linuxfb")
QFactoryLoader::QFactoryLoader() looking at "/opt/Qt/5.15.2/plugins/platforms/libqminimal.so"
Found metadata in lib /opt/Qt/5.15.2/plugins/platforms/libqminimal.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "minimal"
        ]
    },
    "archreq": 0,
    "className": "QMinimalIntegrationPlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("minimal")
QFactoryLoader::QFactoryLoader() looking at "/opt/Qt/5.15.2/plugins/platforms/libqminimalegl.so"
Found metadata in lib /opt/Qt/5.15.2/plugins/platforms/libqminimalegl.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "minimalegl"
        ]
    },
    "archreq": 0,
    "className": "QMinimalEglIntegrationPlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("minimalegl")
QFactoryLoader::QFactoryLoader() looking at "/opt/Qt/5.15.2/plugins/platforms/libqoffscreen.so"
Found metadata in lib /opt/Qt/5.15.2/plugins/platforms/libqoffscreen.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "offscreen"
        ]
    },
    "archreq": 0,
    "className": "QOffscreenIntegrationPlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("offscreen")
QFactoryLoader::QFactoryLoader() looking at "/opt/Qt/5.15.2/plugins/platforms/libqvnc.so"
Found metadata in lib /opt/Qt/5.15.2/plugins/platforms/libqvnc.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "vnc"
        ]
    },
    "archreq": 0,
    "className": "QVncIntegrationPlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("vnc")
QFactoryLoader::QFactoryLoader() looking at "/opt/Qt/5.15.2/plugins/platforms/libqwebgl.so"
Found metadata in lib /opt/Qt/5.15.2/plugins/platforms/libqwebgl.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "webgl"
        ]
    },
    "archreq": 0,
    "className": "QWebGLIntegrationPlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("webgl")
QFactoryLoader::QFactoryLoader() looking at "/opt/Qt/5.15.2/plugins/platforms/libqxcb.so"
Found metadata in lib /opt/Qt/5.15.2/plugins/platforms/libqxcb.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "xcb"
        ]
    },
    "archreq": 0,
    "className": "QXcbIntegrationPlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("xcb")
QFactoryLoader::QFactoryLoader() checking directory path "/home/pi/Downloads/build-hello_speak-Qt_5_15_2_5_15_2-Debug/platforms" ...
loaded library "/opt/Qt/5.15.2/plugins/platforms/libqxcb.so"
loaded library "Xcursor"
QFactoryLoader::QFactoryLoader() checking directory path "/opt/Qt/5.15.2/plugins/platformthemes" ...
QFactoryLoader::QFactoryLoader() looking at "/opt/Qt/5.15.2/plugins/platformthemes/libqxdgdesktopportal.so"
Found metadata in lib /opt/Qt/5.15.2/plugins/platformthemes/libqxdgdesktopportal.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformThemeFactoryInterface.5.1",
    "MetaData": {
        "Keys": [
            "xdgdesktopportal",
            "flatpak",
            "snap"
        ]
    },
    "archreq": 0,
    "className": "QXdgDesktopPortalThemePlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("xdgdesktopportal", "flatpak", "snap")
QFactoryLoader::QFactoryLoader() checking directory path "/home/pi/Downloads/build-hello_speak-Qt_5_15_2_5_15_2-Debug/platformthemes" ...
QFactoryLoader::QFactoryLoader() checking directory path "/opt/Qt/5.15.2/plugins/platforminputcontexts" ...
QFactoryLoader::QFactoryLoader() looking at "/opt/Qt/5.15.2/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so"
Found metadata in lib /opt/Qt/5.15.2/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so, metadata=
{
    "IID": "org.qt-project.Qt.QPlatformInputContextFactoryInterface.5.1",
    "MetaData": {
        "Keys": [
            "compose",
            "xim"
        ]
    },
    "archreq": 0,
    "className": "QComposePlatformInputContextPlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("compose", "xim")
QFactoryLoader::QFactoryLoader() looking at "/opt/Qt/5.15.2/plugins/platforminputcontexts/libibusplatforminputcontextplugin.so"
Found metadata in lib /opt/Qt/5.15.2/plugins/platforminputcontexts/libibusplatforminputcontextplugin.so, metadata=
{
    "IID": "org.qt-project.Qt.QPlatformInputContextFactoryInterface.5.1",
    "MetaData": {
        "Keys": [
            "ibus"
        ]
    },
    "archreq": 0,
    "className": "QIbusPlatformInputContextPlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("ibus")
QFactoryLoader::QFactoryLoader() looking at "/opt/Qt/5.15.2/plugins/platforminputcontexts/libqtvirtualkeyboardplugin.so"
Found metadata in lib /opt/Qt/5.15.2/plugins/platforminputcontexts/libqtvirtualkeyboardplugin.so, metadata=
{
    "IID": "org.qt-project.Qt.QPlatformInputContextFactoryInterface.5.1",
    "MetaData": {
        "Keys": [
            "qtvirtualkeyboard"
        ]
    },
    "archreq": 0,
    "className": "QVirtualKeyboardPlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("qtvirtualkeyboard")
QFactoryLoader::QFactoryLoader() checking directory path "/home/pi/Downloads/build-hello_speak-Qt_5_15_2_5_15_2-Debug/platforminputcontexts" ...
loaded library "/opt/Qt/5.15.2/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so"
QFactoryLoader::QFactoryLoader() checking directory path "/opt/Qt/5.15.2/plugins/styles" ...
QFactoryLoader::QFactoryLoader() checking directory path "/home/pi/Downloads/build-hello_speak-Qt_5_15_2_5_15_2-Debug/styles" ...
QFactoryLoader::QFactoryLoader() checking directory path "/opt/Qt/5.15.2/plugins/texttospeech" ...
QFactoryLoader::QFactoryLoader() looking at "/opt/Qt/5.15.2/plugins/texttospeech/libqtexttospeech_speechd.so"
Found metadata in lib /opt/Qt/5.15.2/plugins/texttospeech/libqtexttospeech_speechd.so, metadata=
{
    "IID": "org.qt-project.qt.speech.tts.plugin/5.0",
    "MetaData": {
        "Features": [
        ],
        "Keys": [
            "speechd"
        ],
        "Provider": "speechd",
        "Version": 100
    },
    "archreq": 0,
    "className": "QTextToSpeechPluginSpeechd",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("speechd")
QFactoryLoader::QFactoryLoader() looking at "/opt/Qt/5.15.2/plugins/texttospeech/libqttexttospeech_flite.so"
Found metadata in lib /opt/Qt/5.15.2/plugins/texttospeech/libqttexttospeech_flite.so, metadata=
{
    "IID": "org.qt-project.qt.speech.tts.plugin/5.0",
    "MetaData": {
        "Features": [
        ],
        "Keys": [
            "flite"
        ],
        "Provider": "flite",
        "Version": 100
    },
    "archreq": 0,
    "className": "QTextToSpeechPluginFlite",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("flite")
QFactoryLoader::QFactoryLoader() checking directory path "/home/pi/Downloads/build-hello_speak-Qt_5_15_2_5_15_2-Debug/texttospeech" ...
loaded library "/opt/Qt/5.15.2/plugins/texttospeech/libqtexttospeech_speechd.so"
QFactoryLoader::QFactoryLoader() checking directory path "/opt/Qt/5.15.2/plugins/xcbglintegrations" ...
QFactoryLoader::QFactoryLoader() checking directory path "/home/pi/Downloads/build-hello_speak-Qt_5_15_2_5_15_2-Debug/xcbglintegrations" ...
QFactoryLoader::QFactoryLoader() checking directory path "/opt/Qt/5.15.2/plugins/accessible" ...
QFactoryLoader::QFactoryLoader() checking directory path "/home/pi/Downloads/build-hello_speak-Qt_5_15_2_5_15_2-Debug/accessible" ...
10:21:48: Debugging has finished

I have also tried to add libs in my pro file and manually load the plugin in mainwindow.cpp (but I got Unknown error from loader.errorString()):

In .pro file:
INCLUDEPATH += /home/pi/Downloads/build/qtspeech/include/QtTextToSpeech
INCLUDEPATH += /home/pi/Downloads/build/qtspeech/include/
LIBS += -L/home/pi/Downloads/build/qtspeech/lib -lQt5TextToSpeech

In mainwindow.cpp:
QPluginLoader loader;
loader.setFileName("/opt/Qt/5.15.2/plugins/texttospeech/libqtexttospeech_speechd.so");
qDebug()<<loader.load();
qDebug()<<loader.errorString();

SGaist

Hi,

Which is the plugin that works properly ?

ollax452

@SGaist I think I have identifyed the problem: it's seems like the default plugin, during start, is not loaded in a deterministic way, sometimes libqtexttospeech_speechd.so is loaded and sometimes the libqttexttospeech_flite is loaded. I managed to fix it by manually load the desired engine at start:

new QTextToSpeech(_engineName, this)

I don't know if its a Qt bug, but it seems like

new QTextToSpeech(this)

will not load the default plugin in a deterministic way.

SGaist

That is a bit strange indeed.

Something to investigate.