PyQt5 QMediaPlayer defaultServiceProvider::requestService(): no service found for - ‘org.qt-project.qt.mediaplayer’

我正在使用 Fedora 28。我正在嘗試執行此程式碼

from PyQt5.QtCore import QCoreApplication, QUrl
from PyQt5.QtMultimedia import QMediaContent, QMediaPlayer
from PyQt5.QtWidgets import QApplication
import sys
import os


def handle_state_change(state):
   if state == QMediaPlayer.LoadingMedia:
       print('loading')
   if state == QMediaPlayer.LoadedMedia:
       print('loading finished')
       player.play()
   if state == QMediaPlayer.EndOfMedia:
       print('playing finished')
       QCoreApplication.quit()


app = QApplication(sys.argv)

url = QUrl.fromLocalFile(os.path.abspath('./redalert.mp3'))

content = QMediaContent(url)
player = QMediaPlayer()
player.mediaStatusChanged.connect(handle_state_change)
player.setVolume(50)
player.setMedia(content)

app.exec()

但是，它會引發此錯誤

Got keys from plugin meta data ("gstreamermediaplayer")
QFactoryLoader::QFactoryLoader() checking directory path "/home/ziggs/PycharmProjects/mozart/venv/bin/mediaservice" ...
Cannot load library /home/ziggs/PycharmProjects/mozart/venv/lib/python3.6/site-packages/PyQt5/Qt/plugins/mediaservice/libgstmediaplayer.so: (/lib64/libQt5MultimediaGstTools.so.5: version `Qt_5_PRIVATE_API' not found (required by /home/ziggs/PycharmProjects/mozart/venv/lib/python3.6/site-packages/PyQt5/Qt/plugins/mediaservice/libgstmediaplayer.so))
QLibraryPrivate::loadPlugin failed on "/home/ziggs/PycharmProjects/mozart/venv/lib/python3.6/site-packages/PyQt5/Qt/plugins/mediaservice/libgstmediaplayer.so" : "Cannot load library /home/ziggs/PycharmProjects/mozart/venv/lib/python3.6/site-packages/PyQt5/Qt/plugins/mediaservice/libgstmediaplayer.so: (/lib64/libQt5MultimediaGstTools.so.5: version `Qt_5_PRIVATE_API' not found (required by /home/ziggs/PycharmProjects/mozart/venv/lib/python3.6/site-packages/PyQt5/Qt/plugins/mediaservice/libgstmediaplayer.so))"
defaultServiceProvider::requestService(): no service found for - "org.qt-project.qt.mediaplayer"

我已經用Google搜尋了錯誤並嘗試安裝相關外掛

dnf list qt5-qtmultimedia gstreamer-plugins-ugly
Letzte Prüfung auf abgelaufene Metadaten: vor 0:45:12 am Mo 18 Jun 2018 21:42:00 CEST.
Installierte Pakete
gstreamer-plugins-ugly.x86_64                              0.10.19-27.fc28                               @rpmfusion-free
qt5-qtmultimedia.x86_64                                    5.10.1-1.fc28                                 @anaconda      
Verfügbare Pakete
gstreamer-plugins-ugly.i686                                0.10.19-27.fc28                               rpmfusion-free 
qt5-qtmultimedia.i686                                      5.10.1-1.fc28                                 fedora   

我對 Qt5.10 有同樣的問題。

我必須回到 Qt5.8 才能讓它工作。

引用自：https://unix.stackexchange.com/questions/450507