Qml Videoouput only display with sudo

Ycycz

my qml application use Videoouput element to display yuv data.
if run with sudo

sudo ./myApp

my application work fine.VideoOutput can display video.
if run

./myApp

VideoOutput can not display video.
when I set QT_DEBUG_PLUGINS=1, if application work normaly, application will link to libqxcb-egl-integration.so .run sudo ./myApp

loaded library "/opt/qt-5.15.2-release/qml/QtMultimedia/libdeclarative_multimedia.so"
Found metadata in lib /opt/qt-5.15.2-release/qml/QtQml/libqmlplugin.so, metadata=
{
    "IID": "org.qt-project.Qt.QQmlExtensionInterface/1.0",
    "archreq": 0,
    "className": "QtQmlPlugin",
    "debug": false,
    "uri": [
        "QtQml"
    ],
    "version": 331520
}


loaded library "/opt/qt-5.15.2-release/qml/QtQml/libqmlplugin.so"
QFactoryLoader::QFactoryLoader() checking directory path "/opt/qt-5.15.2-release/plugins/xcbglintegrations" ...
QFactoryLoader::QFactoryLoader() looking at "/opt/qt-5.15.2-release/plugins/xcbglintegrations/libqxcb-egl-integration.so"
Found metadata in lib /opt/qt-5.15.2-release/plugins/xcbglintegrations/libqxcb-egl-integration.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.Xcb.QXcbGlIntegrationFactoryInterface.5.5",
    "MetaData": {
        "Keys": [
            "xcb_egl"
        ]
    },
    "archreq": 0,
    "className": "QXcbEglIntegrationPlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("xcb_egl")
QFactoryLoader::QFactoryLoader() checking directory path "/home/greatwall/lyc/QTFrame/bin/debug/xcbglintegrations" ...
loaded library "/opt/qt-5.15.2-release/plugins/xcbglintegrations/libqxcb-egl-integration.so"
libEGL warning: DRI2: failed to authenticate
QFactoryLoader::QFactoryLoader() checking directory path "/opt/qt-5.15.2-release/plugins/video/declarativevideobackend" ...
QFactoryLoader::QFactoryLoader() checking directory path "/home/greatwall/lyc/QTFrame/bin/debug/video/declarativevideobackend" ...
QFactoryLoader::QFactoryLoader() checking directory path "/opt/qt-5.15.2-release/plugins/video/videonode" ...
QFactoryLoader::QFactoryLoader() looking at "/opt/qt-5.15.2-release/plugins/video/videonode/libeglvideonode.so"
Found metadata in lib /opt/qt-5.15.2-release/plugins/video/videonode/libeglvideonode.so, metadata=
{
    "IID": "org.qt-project.qt.sgvideonodefactory/5.2",
    "MetaData": {
        "Keys": [
            "egl"
        ]
    },
    "archreq": 0,
    "className": "QSGVideoNodeFactory_EGL",
    "debug": false,
    "version": 331520
}

but if run ./myApp

loaded library "/opt/qt-5.15.2-release/qml/QtMultimedia/libdeclarative_multimedia.so"
Found metadata in lib /opt/qt-5.15.2-release/qml/QtQml/libqmlplugin.so, metadata=
{
    "IID": "org.qt-project.Qt.QQmlExtensionInterface/1.0",
    "archreq": 0,
    "className": "QtQmlPlugin",
    "debug": false,
    "uri": [
        "QtQml"
    ],
    "version": 331520
}


loaded library "/opt/qt-5.15.2-release/qml/QtQml/libqmlplugin.so"
QFactoryLoader::QFactoryLoader() checking directory path "/opt/qt-5.15.2-release/plugins/video/declarativevideobackend" ...
QFactoryLoader::QFactoryLoader() checking directory path "/home/greatwall/lyc/QTFrame/bin/debug/video/declarativevideobackend" ...
QFactoryLoader::QFactoryLoader() checking directory path "/opt/qt-5.15.2-release/plugins/video/videonode" ...
QFactoryLoader::QFactoryLoader() looking at "/opt/qt-5.15.2-release/plugins/video/videonode/libeglvideonode.so"
Found metadata in lib /opt/qt-5.15.2-release/plugins/video/videonode/libeglvideonode.so, metadata=
{
    "IID": "org.qt-project.qt.sgvideonodefactory/5.2",
    "MetaData": {
        "Keys": [
            "egl"
        ]
    },
    "archreq": 0,
    "className": "QSGVideoNodeFactory_EGL",
    "debug": false,
    "version": 331520
}

Can someone help me to solve the problem.

Ycycz

I find QMLSCENE_DEVICE=softwarecontext in my OS，VideoOuput cannot use software to render.
Qt Quick Software Adaptation