qt.qpa.plugin : Impossible de charger le plugin de la plate-forme Qt "xcb" dans "" bien qu'il ait été trouvé."

Question

J'ai installé gqcnn , Pyrep y autolab_core . Après cela, j'ai exécuté le code que mon collègue a écrit et il a bien fonctionné sur son ordinateur.

Cependant, je ne peux pas exécuter le code. L'erreur survenue est la suivante

python3.7/site-packages/cv2/qt/plugins/platforms" ...
QFactoryLoader::QFactoryLoader() looking at "/home/bak/anaconda3/envs/pyrep/lib/python3.7/site-packages/cv2/qt/plugins/platforms/libqxcb.so"
Found metadata in lib /home/bak/anaconda3/envs/pyrep/lib/python3.7/site-packages/cv2/qt/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
}

In /home/bak/anaconda3/envs/pyrep/lib/python3.7/site-packages/cv2/qt/plugins/platforms/libqxcb.so:
  Plugin uses incompatible Qt library (5.15.0) [release]
"The plugin '/home/bak/anaconda3/envs/pyrep/lib/python3.7/site-packages/cv2/qt/plugins/platforms/libqxcb.so' uses incompatible Qt library. (5.15.0) [release]" 
         not a plugin
QFactoryLoader::QFactoryLoader() checking directory path "/home/bak/anaconda3/envs/pyrep/plugins/platforms" ...
QFactoryLoader::QFactoryLoader() looking at "/home/bak/anaconda3/envs/pyrep/plugins/platforms/libqeglfs.so"
Found metadata in lib /home/bak/anaconda3/envs/pyrep/plugins/platforms/libqeglfs.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "eglfs"
        ]
    },
    "className": "QEglFSIntegrationPlugin",
    "debug": false,
    "version": 329991
}

Got keys from plugin meta data ("eglfs")
QFactoryLoader::QFactoryLoader() looking at "/home/bak/anaconda3/envs/pyrep/plugins/platforms/libqminimal.so"
Found metadata in lib /home/bak/anaconda3/envs/pyrep/plugins/platforms/libqminimal.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "minimal"
        ]
    },
    "className": "QMinimalIntegrationPlugin",
    "debug": false,
    "version": 329991
}

Got keys from plugin meta data ("minimal")
QFactoryLoader::QFactoryLoader() looking at "/home/bak/anaconda3/envs/pyrep/plugins/platforms/libqminimalegl.so"
Found metadata in lib /home/bak/anaconda3/envs/pyrep/plugins/platforms/libqminimalegl.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "minimalegl"
        ]
    },
    "className": "QMinimalEglIntegrationPlugin",
    "debug": false,
    "version": 329991
}

Got keys from plugin meta data ("minimalegl")
QFactoryLoader::QFactoryLoader() looking at "/home/bak/anaconda3/envs/pyrep/plugins/platforms/libqoffscreen.so"
Found metadata in lib /home/bak/anaconda3/envs/pyrep/plugins/platforms/libqoffscreen.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "offscreen"
        ]
    },
    "className": "QOffscreenIntegrationPlugin",
    "debug": false,
    "version": 329991
}

Got keys from plugin meta data ("offscreen")
QFactoryLoader::QFactoryLoader() looking at "/home/bak/anaconda3/envs/pyrep/plugins/platforms/libqvnc.so"
Found metadata in lib /home/bak/anaconda3/envs/pyrep/plugins/platforms/libqvnc.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "vnc"
        ]
    },
    "className": "QVncIntegrationPlugin",
    "debug": false,
    "version": 329991
}

Got keys from plugin meta data ("vnc")
QFactoryLoader::QFactoryLoader() looking at "/home/bak/anaconda3/envs/pyrep/plugins/platforms/libqxcb.so"
Found metadata in lib /home/bak/anaconda3/envs/pyrep/plugins/platforms/libqxcb.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "xcb"
        ]
    },
    "className": "QXcbIntegrationPlugin",
    "debug": false,
    "version": 329991
}

Got keys from plugin meta data ("xcb")
QFactoryLoader::QFactoryLoader() checking directory path "/home/bak/anaconda3/envs/pyrep/bin/platforms" ...
Cannot load library /home/bak/anaconda3/envs/pyrep/plugins/platforms/libqxcb.so: (/home/bak/anaconda3/envs/pyrep/plugins/platforms/../../lib/libQt5XcbQpa.so.5: symbol _ZN11QFontEngine14bitmapForGlyphEj6QFixedRK10QTransform version Qt_5_PRIVATE_API not defined in file libQt5Gui.so.5 with link time reference)
QLibraryPrivate::loadPlugin failed on "/home/bak/anaconda3/envs/pyrep/plugins/platforms/libqxcb.so" : "Cannot load library /home/bak/anaconda3/envs/pyrep/plugins/platforms/libqxcb.so: (/home/bak/anaconda3/envs/pyrep/plugins/platforms/../../lib/libQt5XcbQpa.so.5: symbol _ZN11QFontEngine14bitmapForGlyphEj6QFixedRK10QTransform version Qt_5_PRIVATE_API not defined in file libQt5Gui.so.5 with link time reference)"
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "/home/bak/anaconda3/envs/pyrep/lib/python3.7/site-packages/cv2/qt/plugins" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: eglfs, minimal, minimalegl, offscreen, vnc, xcb.

Si vous voulez voir l'erreur complète en détail, veuillez voir ici . '/pyrep/' dans le texte ci-dessus est le nom de mon environnement anaconda.

Il semble être causé par qt. Mais je ne peux pas résoudre ce problème.

Que dois-je faire pour résoudre ce problème ?

Answer 1

Cela peut être lié à une message d'erreur similaire .

Je viens de tomber sur ce problème, dans Ubuntu 20.04, Python 3.8, en essayant d'utiliser matplotlib_backend_qtquick .

Cette réponse dans le fil de discussion mentionné a résolu le problème pour moi : https://askubuntu.com/a/1069502

Answer 2

Enfin, je trouve la solution ! https://github.com/stepjam/PyRep/issues/76

Le problème était le chargement de Qt dans l'environnement Conda.

Quand j'ai tapé qmake -version la fenêtre du terminal m'a montré le qt dans anaconda. Après avoir suivi la première réponse à l'URL ci-dessus, j'ai pu résoudre le problème.

Answer 3

Ce problème se produit lorsque vous utilisez opencv con pyqt5 . Il semble que le plugin qt soit utilisé en interne par opencv n'est pas compatible avec pyqt5 . Il suffit de désactiver la variable d'environnement QT_QPA_PLATFORM_PLUGIN_PATH après import cv2 déclaration.

import os

os.environ.pop("QT_QPA_PLATFORM_PLUGIN_PATH")

Vous pouvez également mettre à jour le chemin du plugin de la plateforme après l'importation. opencv

import os

os.environ.update({"QT_QPA_PLATFORM_PLUGIN_PATH": "/home/udara/anaconda3/envs/research-headless/lib/python3.8/site-packages/PyQt5/Qt5/plugins/xcbglintegrations/libqxcb-glx-integration.so"})

Références https://forum.qt.io/post/654289