moviepy.video.fx.all.fadeout

moviepy.video.fx.all.fadeout(clip, duration, final_color=None)

Makes the clip progressively fade to some color (black by default), over duration seconds at the end of the clip. Can be used for masks too, where the final color must be a number between 0 and 1. For cross-fading (progressive appearance or disappearance of a clip over another clip, see composition.crossfade