Qt Forum
    • Login
    • Search
    • Categories
    • Recent
    • Tags
    • Popular
    • Users
    • Groups
    • Search
    • Unsolved

    Unsolved Plugin cannot be loaded for module “QtMultimedia”. Cannot load library declarative_multimedia.dll

    General and Desktop
    3
    3
    908
    Loading More Posts
    • Oldest to Newest
    • Newest to Oldest
    • Most Votes
    Reply
    • Reply as topic
    Log in to reply
    This topic has been deleted. Only users with topic management privileges can see it.
    • R
      RoboDoig last edited by

      I'm creating a PyQt5 + qml application. Windows 10, PyQt5 5.13.2, Python 3.6. Everything works fine until I try and import QtMultimedia, which results in the error message:

      QQmlApplicationEngine failed to load component
file:///C:/Users/user/PycharmProjects/Project/project/pyqt-gui/pyqt-gui/main.qml:9
plugin cannot be loaded for module "QtMultimedia": Cannot load library C:\Users\user\PycharmProjects\Project\venv\lib\site-packages\PyQt5\Qt\qml\QtMultimedia\declarative_multimedia.dll: The specified module could not be found.

      This seems to persist across different virtual environments and versions of PyQt and QtMultimedia. I've also confirmed that the .dll file is present in the environment.

      main.qml:

      import QtQuick 2.12
import QtQuick.Window 2.12
import QtQuick.Layouts 1.3
import QtQuick.Controls 2.13
import QtQuick.Shapes 1.11
import QtQuick.Dialogs 1.1
import QtQuick.Controls.Styles 1.4
import QtCharts 2.3
import QtMultimedia 5.10

ApplicationWindow {
    id: appWindow
    visible: true
    width: 1920
    height: 1080
    color: "#313131"
    title: qsTr("Project PyQt")
}

      main.py:

      import sys

from PyQt5.QtQml import QQmlApplicationEngine
from PyQt5.QtWidgets import QApplication
from PyQt5.QtCore import QUrl

from interface import Interface

if __name__ == '__main__':
    app = QApplication(sys.argv)

    appEngine = QQmlApplicationEngine()

    context = appEngine.rootContext()

    appEngine.load(QUrl('pyqt-gui/main.qml'))

    win = appEngine.rootObjects()[0]

    # Register Python classes with qml
    interface = Interface(app, context, win)

    context.setContextProperty('iface', interface)

    win.show()
    try:
        apcode = app.exec_()
    except:
        print('there was an issue')
    finally:
        sys.exit(apcode)

      Installation of pyqt is from a fresh venv or conda env + pip install pyqt5

      On adding os.environ["QT_DEBUG_PLUGINS"] = "1" the console output is:

      QFactoryLoader::QFactoryLoader() checking directory path "C:/Users/shires/PycharmProjects/DeepLabCut/venv/lib/site-packages/PyQt5/Qt/plugins/platforms" ...
QFactoryLoader::QFactoryLoader() looking at "C:/Users/shires/PycharmProjects/DeepLabCut/venv/lib/site-packages/PyQt5/Qt/plugins/platforms/qminimal.dll"
Found metadata in lib C:/Users/shires/PycharmProjects/DeepLabCut/venv/lib/site-packages/PyQt5/Qt/plugins/platforms/qminimal.dll, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "minimal"
        ]
    },
    "archreq": 0,
    "className": "QMinimalIntegrationPlugin",
    "debug": false,
    "version": 331008
}


Got keys from plugin meta data ("minimal")
QFactoryLoader::QFactoryLoader() looking at "C:/Users/shires/PycharmProjects/DeepLabCut/venv/lib/site-packages/PyQt5/Qt/plugins/platforms/qoffscreen.dll"
Found metadata in lib C:/Users/shires/PycharmProjects/DeepLabCut/venv/lib/site-packages/PyQt5/Qt/plugins/platforms/qoffscreen.dll, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "offscreen"
        ]
    },
    "archreq": 0,
    "className": "QOffscreenIntegrationPlugin",
    "debug": false,
    "version": 331008
}


Got keys from plugin meta data ("offscreen")
QFactoryLoader::QFactoryLoader() looking at "C:/Users/shires/PycharmProjects/DeepLabCut/venv/lib/site-packages/PyQt5/Qt/plugins/platforms/qwebgl.dll"
Found metadata in lib C:/Users/shires/PycharmProjects/DeepLabCut/venv/lib/site-packages/PyQt5/Qt/plugins/platforms/qwebgl.dll, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "webgl"
        ]
    },
    "archreq": 0,
    "className": "QWebGLIntegrationPlugin",
    "debug": false,
    "version": 331008
}


Got keys from plugin meta data ("webgl")
QFactoryLoader::QFactoryLoader() looking at "C:/Users/shires/PycharmProjects/DeepLabCut/venv/lib/site-packages/PyQt5/Qt/plugins/platforms/qwindows.dll"
Found metadata in lib C:/Users/shires/PycharmProjects/DeepLabCut/venv/lib/site-packages/PyQt5/Qt/plugins/platforms/qwindows.dll, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "windows"
        ]
    },
    "archreq": 0,
    "className": "QWindowsIntegrationPlugin",
    "debug": false,
    "version": 331008
}


Got keys from plugin meta data ("windows")
QFactoryLoader::QFactoryLoader() checking directory path "C:/Users/shires/PycharmProjects/DeepLabCut/venv/Scripts/platforms" ...
loaded library "C:/Users/shires/PycharmProjects/DeepLabCut/venv/lib/site-packages/PyQt5/Qt/plugins/platforms/qwindows.dll"
QFactoryLoader::QFactoryLoader() checking directory path "C:/Users/shires/PycharmProjects/DeepLabCut/venv/lib/site-packages/PyQt5/Qt/plugins/platformthemes" ...
QFactoryLoader::QFactoryLoader() looking at "C:/Users/shires/PycharmProjects/DeepLabCut/venv/lib/site-packages/PyQt5/Qt/plugins/platformthemes/qxdgdesktopportal.dll"
Found metadata in lib C:/Users/shires/PycharmProjects/DeepLabCut/venv/lib/site-packages/PyQt5/Qt/plugins/platformthemes/qxdgdesktopportal.dll, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformThemeFactoryInterface.5.1",
    "MetaData": {
        "Keys": [
            "xdgdesktopportal",
            "flatpak",
            "snap"
        ]
    },
    "archreq": 0,
    "className": "QXdgDesktopPortalThemePlugin",
    "debug": false,
    "version": 331008
}


Got keys from plugin meta data ("xdgdesktopportal", "flatpak", "snap")
QFactoryLoader::QFactoryLoader() checking directory path "C:/Users/shires/PycharmProjects/DeepLabCut/venv/Scripts/platformthemes" ...
QFactoryLoader::QFactoryLoader() checking directory path "C:/Users/shires/PycharmProjects/DeepLabCut/venv/lib/site-packages/PyQt5/Qt/plugins/styles" ...
QFactoryLoader::QFactoryLoader() looking at "C:/Users/shires/PycharmProjects/DeepLabCut/venv/lib/site-packages/PyQt5/Qt/plugins/styles/qwindowsvistastyle.dll"
Found metadata in lib C:/Users/shires/PycharmProjects/DeepLabCut/venv/lib/site-packages/PyQt5/Qt/plugins/styles/qwindowsvistastyle.dll, metadata=
{
    "IID": "org.qt-project.Qt.QStyleFactoryInterface",
    "MetaData": {
        "Keys": [
            "windowsvista"
        ]
    },
    "archreq": 0,
    "className": "QWindowsVistaStylePlugin",
    "debug": false,
    "version": 331008
}


Got keys from plugin meta data ("windowsvista")
QFactoryLoader::QFactoryLoader() checking directory path "C:/Users/shires/PycharmProjects/DeepLabCut/venv/Scripts/styles" ...
loaded library "C:/Users/shires/PycharmProjects/DeepLabCut/venv/lib/site-packages/PyQt5/Qt/plugins/styles/qwindowsvistastyle.dll"
Found metadata in lib C:/Users/shires/PycharmProjects/DeepLabCut/venv/lib/site-packages/PyQt5/Qt/qml/QtQuick.2/qtquick2plugin.dll, metadata=
{
    "IID": "org.qt-project.Qt.QQmlExtensionInterface/1.0",
    "archreq": 0,
    "className": "QtQuick2Plugin",
    "debug": false,
    "uri": [
        "QtQuick.2"
    ],
    "version": 331008
}


loaded library "C:/Users/shires/PycharmProjects/DeepLabCut/venv/lib/site-packages/PyQt5/Qt/qml/QtQuick.2/qtquick2plugin.dll"
Found metadata in lib C:/Users/shires/PycharmProjects/DeepLabCut/venv/lib/site-packages/PyQt5/Qt/qml/QtQuick/Window.2/windowplugin.dll, metadata=
{
    "IID": "org.qt-project.Qt.QQmlExtensionInterface/1.0",
    "archreq": 0,
    "className": "QtQuick2WindowPlugin",
    "debug": false,
    "uri": [
        "QtQuick.Window.2"
    ],
    "version": 331008
}


loaded library "C:/Users/shires/PycharmProjects/DeepLabCut/venv/lib/site-packages/PyQt5/Qt/qml/QtQuick/Window.2/windowplugin.dll"
Found metadata in lib C:/Users/shires/PycharmProjects/DeepLabCut/venv/lib/site-packages/PyQt5/Qt/qml/QtQuick/Layouts/qquicklayoutsplugin.dll, metadata=
{
    "IID": "org.qt-project.Qt.QQmlExtensionInterface/1.0",
    "archreq": 0,
    "className": "QtQuickLayoutsPlugin",
    "debug": false,
    "uri": [
        "QtQuick.Layouts"
    ],
    "version": 331008
}


loaded library "C:/Users/shires/PycharmProjects/DeepLabCut/venv/lib/site-packages/PyQt5/Qt/qml/QtQuick/Layouts/qquicklayoutsplugin.dll"
Found metadata in lib C:/Users/shires/PycharmProjects/DeepLabCut/venv/lib/site-packages/PyQt5/Qt/qml/QtQuick/Controls.2/qtquickcontrols2plugin.dll, metadata=
{
    "IID": "org.qt-project.Qt.QQmlExtensionInterface/1.0",
    "archreq": 0,
    "className": "QtQuickControls2Plugin",
    "debug": false,
    "uri": [
        "QtQuick.Controls.2"
    ],
    "version": 331008
}


loaded library "C:/Users/shires/PycharmProjects/DeepLabCut/venv/lib/site-packages/PyQt5/Qt/qml/QtQuick/Controls.2/qtquickcontrols2plugin.dll"
Found metadata in lib C:/Users/shires/PycharmProjects/DeepLabCut/venv/lib/site-packages/PyQt5/Qt/qml/QtQuick/Shapes/qmlshapesplugin.dll, metadata=
{
    "IID": "org.qt-project.Qt.QQmlExtensionInterface/1.0",
    "archreq": 0,
    "className": "QmlShapesPlugin",
    "debug": false,
    "uri": [
        "QtQuick.Shapes"
    ],
    "version": 331008
}


loaded library "C:/Users/shires/PycharmProjects/DeepLabCut/venv/lib/site-packages/PyQt5/Qt/qml/QtQuick/Shapes/qmlshapesplugin.dll"
Found metadata in lib C:/Users/shires/PycharmProjects/DeepLabCut/venv/lib/site-packages/PyQt5/Qt/qml/QtQuick/Dialogs/dialogplugin.dll, metadata=
{
    "IID": "org.qt-project.Qt.QQmlExtensionInterface/1.0",
    "archreq": 0,
    "className": "QtQuick2DialogsPlugin",
    "debug": false,
    "uri": [
        "QtQuick.Dialogs"
    ],
    "version": 331008
}


loaded library "C:/Users/shires/PycharmProjects/DeepLabCut/venv/lib/site-packages/PyQt5/Qt/qml/QtQuick/Dialogs/dialogplugin.dll"
Found metadata in lib C:/Users/shires/PycharmProjects/DeepLabCut/venv/lib/site-packages/PyQt5/Qt/qml/QtCharts/qtchartsqml2.dll, metadata=
{
    "IID": "org.qt-project.Qt.QQmlExtensionInterface/1.0",
    "archreq": 0,
    "className": "QtChartsQml2Plugin",
    "debug": false,
    "uri": [
        "QtCharts"
    ],
    "version": 331008
}


loaded library "C:/Users/shires/PycharmProjects/DeepLabCut/venv/lib/site-packages/PyQt5/Qt/qml/QtCharts/qtchartsqml2.dll"
Found metadata in lib C:/Users/shires/PycharmProjects/DeepLabCut/venv/lib/site-packages/PyQt5/Qt/qml/QtMultimedia/declarative_multimedia.dll, metadata=
{
    "IID": "org.qt-project.Qt.QQmlExtensionInterface/1.0",
    "archreq": 0,
    "className": "QMultimediaDeclarativeModule",
    "debug": false,
    "uri": [
        "QtMultimedia"
    ],
    "version": 331008
}


Cannot load library C:\Users\shires\PycharmProjects\DeepLabCut\venv\lib\site-packages\PyQt5\Qt\qml\QtMultimedia\declarative_multimedia.dll: The specified module could not be found.
QLibraryPrivate::loadPlugin failed on "C:/Users/shires/PycharmProjects/DeepLabCut/venv/lib/site-packages/PyQt5/Qt/qml/QtMultimedia/declarative_multimedia.dll" : "Cannot load library C:\\Users\\shires\\PycharmProjects\\DeepLabCut\\venv\\lib\\site-packages\\PyQt5\\Qt\\qml\\QtMultimedia\\declarative_multimedia.dll: The specified module could not be found."
QQmlApplicationEngine failed to load component
file:///C:/Users/shires/PycharmProjects/DeepLabCut/deeplabcut/pyqt-gui/pyqt-gui/main.qml:9 plugin cannot be loaded for module "QtMultimedia": Cannot load library C:\Users\shires\PycharmProjects\DeepLabCut\venv\lib\site-packages\PyQt5\Qt\qml\QtMultimedia\declarative_multimedia.dll: The specified module could not be found.

Traceback (most recent call last):
  File "C:/Users/shires/PycharmProjects/DeepLabCut/deeplabcut/pyqt-gui/main.py", line 20, in <module>
    win = appEngine.rootObjects()[0]
IndexError: list index out of range
QLibraryPrivate::unload succeeded on "C:/Users/shires/PycharmProjects/DeepLabCut/venv/lib/site-packages/PyQt5/Qt/plugins/styles/qwindowsvistastyle.dll" 
QLibraryPrivate::unload succeeded on "C:/Users/shires/PycharmProjects/DeepLabCut/venv/lib/site-packages/PyQt5/Qt/plugins/platforms/qwindows.dll" 
On QtCore unload, "C:/Users/shires/PycharmProjects/DeepLabCut/venv/lib/site-packages/PyQt5/Qt/qml/QtCharts/qtchartsqml2.dll" was leaked, with 2 users
On QtCore unload, "C:/Users/shires/PycharmProjects/DeepLabCut/venv/lib/site-packages/PyQt5/Qt/qml/QtQuick.2/qtquick2plugin.dll" was leaked, with 2 users
On QtCore unload, "C:/Users/shires/PycharmProjects/DeepLabCut/venv/lib/site-packages/PyQt5/Qt/qml/QtQuick/Controls.2/qtquickcontrols2plugin.dll" was leaked, with 2 users
On QtCore unload, "C:/Users/shires/PycharmProjects/DeepLabCut/venv/lib/site-packages/PyQt5/Qt/qml/QtQuick/Dialogs/dialogplugin.dll" was leaked, with 2 users
On QtCore unload, "C:/Users/shires/PycharmProjects/DeepLabCut/venv/lib/site-packages/PyQt5/Qt/qml/QtQuick/Layouts/qquicklayoutsplugin.dll" was leaked, with 2 users
On QtCore unload, "C:/Users/shires/PycharmProjects/DeepLabCut/venv/lib/site-packages/PyQt5/Qt/qml/QtQuick/Shapes/qmlshapesplugin.dll" was leaked, with 2 users
On QtCore unload, "C:/Users/shires/PycharmProjects/DeepLabCut/venv/lib/site-packages/PyQt5/Qt/qml/QtQuick/Window.2/windowplugin.dll" was leaked, with 2 users

Process finished with exit code 1
      1 Reply Last reply Reply Quote 0
      • A
        alrevuelta last edited by

        Same issue here, also using PyQt5 + QML but in macOS, with Python 3.6 and QtMultimedia 5.11. Did you manage to fix it?
        I'm running the program in the terminal python3 mygui.py in case it matters.

        1 Reply Last reply Reply Quote 0
        • SGaist
          SGaist Lifetime Qt Champion last edited by

          Hi,

          From the looks of it, the deployment of PyQt5 is wrong in that respect. You should check with their author.

          You might also want to try PySide2.

          Interested in AI ? www.idiap.ch
          Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

          1 Reply Last reply Reply Quote 0
          • First post
            Last post