[Python] Why it's not adding a sound (the path of files are correct, and the audio of file is...

import moviepy.editor as mpe
my_clip = mpe.VideoFileClip('output.mp4')
audio_background = mpe.AudioFileClip('ayah.mp3')
final_clip = my_clip.set_audio(audio_background)
final_clip.write_videofile('final_output.mp4', codec='libx264', audio_codec='aac')


It outputs the the video without a sound i tried to change the ayah.mp3 to wav but it doesn't work

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