如何在PyQt5应用中显示write_audiofile从moviepy转换的进度？

from PyQt5.QtWidgets import QApplication, QMainWindow, QProgressBar
from PyQt5.QtCore import QThread, pyqtSignal
from moviepy.editor import VideoFileClip

class ConvertThread(QThread):
    progressUpdated = pyqtSignal(int)
    
    def __init__(self, filename):
        super().__init__()
        self.filename = filename
    
    def run(self):
        video = VideoFileClip(self.filename)
        audio = video.audio
        audio.write_audiofile("output.mp3", progress_bar=self.progressUpdated.emit)

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        self.progressBar = QProgressBar(self)
        self.setCentralWidget(self.progressBar)
    
    def updateProgress(self, value):
        self.progressBar.setValue(value)

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        self.progressBar = QProgressBar(self)
        self.setCentralWidget(self.progressBar)
        
        self.thread = ConvertThread("input.mp4")
        self.thread.progressUpdated.connect(self.updateProgress)
        self.thread.start()
    
    def updateProgress(self, value):
        self.progressBar.setValue(value)