how to replace audio of video

[wanghaisheng]

in moviepy i can do this

            audioclip = AudioFileClip(soundeffect)
          
            os.rename(inputmp4, videofilename+'-old'+videoext)
            videoclip = VideoFileClip(videofilename+'-old'+videoext)
            if audioclip.duration>videoclip.duration:
                audioclip =audioclip.subclip(0,videoclip.duration)
            else:
                audioclip = vfx.loop( audioclip, duration=videoclip.duration)
            if setting['ratio']:
                pass
            else:
                setting['ratio']=1
            audioclip = audioclip.fx( afx.volumex, float(setting['ratio']))
            # audioclip = volumex(audioclip,setting['ratio'])          
            videoclip = videoclip.set_audio(audioclip)

            videoclip.write_videofile(videofilename+'.mp4', threads=0,audio=False)