QtMultimedia PySide2 Error

[Pratik Tayshete]

I am trying to play a simple mp4 file using QtMultimedia in PySide2 but it gives the following error:

import sys
from PySide2.QtWidgets import QApplication
from PySide2.QtCore import QUrl
from PySide2.QtMultimedia import QMediaPlayer, QMediaPlaylist
from PySide2.QtMultimediaWidgets import QVideoWidget




if __name__ == '__main__':
    app = QApplication()
    playlist = QMediaPlaylist()
    playlist.setCurrentIndex(1)

    player = QMediaPlayer()
    player.setMedia(QUrl.fromLocalFile("demo.mp4"))
    player.setPlaylist(playlist)

    videoWidget = QVideoWidget()
    player.setVideoOutput(videoWidget)
    videoWidget.show()
    player.play()
    sys.exit(app.exec_())

Error:

GStreamer; Unable to pause - "file:demo.mp4"