[Python] Python MoviePy Can't Speed Up Video

Why am I unable to speed up videos with MoviePy? There are two versions MultiplySpeed and speedx, but I couldn't get either working. When I use MutiplySpeed below, I receive the error: Exception has occurred: AttributeError 'MultiplySpeed' object has no attribute 'write_videofile'. Please send help.

import moviepy.video.fx as vfx
from moviepy.video.fx import MultiplySpeed


# Load the video
clip = VideoFileClip(r"xxx.mp4")
clip = MultiplySpeed(2)
clip.write_videofile("output_fast.mp4", codec="libx264")

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