I got a problem when I try to play a song from a certain position: it does'nt work (the song plays from the beginning).

This problem only occurs when the song is a 'mp3' song, not a 'm4a' one (they're the only format I tested).

The problem seems to come from qt (or PyQt ?) but I'm not sure, here's a minimal example, do I miss something ?

```py
from PyQt5.QtWidgets import QApplication
from PyQt5.QtMultimedia import QMediaContent, QMediaPlayer
from PyQt5.QtCore import QUrl

if __name__ == "__main__":
    app = QApplication([])

    player = QMediaPlayer()
    media_content = QMediaContent(QUrl.fromLocalFile("path_to_my_music_file.mp3"))
    player.setMedia(media_content)
    player.setPosition(10000)
    player.play()

    app.exec_()

```