title: Plugin cannot be loaded for module "QtMultimedia". Cannot load library declarative_multimedia.dll
body: <p>I'm creating a PyQt5 + qml application. <strong>Windows 10, PyQt5 5.13.2, Python 3.6</strong>. Everything works fine until I try and import QtMultimedia, which results in the error message:</p>
  
  <pre><code>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.
  </code></pre>
  
  <p>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. </p>
  
  <p><strong>main.qml:</strong></p>
  
  <pre><code>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")
  }
  </code></pre>
  
  <p><strong>main.py:</strong></p>
  
  <pre><code>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)
  </code></pre>
  
  <p>Any advice on where I'm going wrong much appreciated, I'm very stuck!</p>
  
  <p>Installation of pyqt is from a fresh venv or conda env + <code>pip install pyqt5</code></p>
  
  <p><strong>Edit 1:</strong> On adding <code>os.environ["QT_DEBUG_PLUGINS"] = "1"</code> the console output is:</p>
  
  <pre><code>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 &lt;module&gt;
      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
  </code></pre>
  
  <p><strong>Edit 2:</strong> Using dependency walker on the 'missing' .dll:</p>
  
  <p><a href="https://i.stack.imgur.com/SKNNU.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/SKNNU.jpg" alt="Dependency walker"></a></p>