code: def makeAnimation(self):
          
          aclip=mpy.AudioFileClip("sound.wav")
          self.iS=self.iS.set_audio(aclip)
          self.iS.write_videofile("mixedVideo.webm",15,audio=True)
          print("wrote "+"mixedVideo.webm")
docs: Use pymovie to render (visual+audio)+text overlays.