MoviePy Composite Video – Adding Cross Fade in Effect

21 May, 2021
In this article we will see how we can add cross fade in effect in composite video file in MoviePy. MoviePy is a Python module for video editing, which can be used for basic operations on videos and GIF’s. Meaning of composite is combining different elements, composite video is the combination of different video clips unlike stacking and concatenation of video files composite files are easy to implement but complex structure. Composite file combine the clips over one another and get played at same time, position and timing of video playback can be set any time. Cross fade is effect is set so that smooth transition occurs when clips get changed. Cross fade means to fade in (a sound or image) in a motion picture or a radio or television program while fading out another sound or image.
In order to do this we will use crossfadein method with the VideoFileClip objectSyntax : clip.crossfadein(n)Argument : It takes float as argumentReturn : It returns VideoFileClip object  
Below is the implementation  
Python3
# Import everything needed to edit video clipsfrom moviepy.editor import *  # loading video dsa gfg intro videoclip = VideoFileClip("dsa_geek.webm")  # getting only first 5 secondsclip1 = clip.subclip(0, 5)  # rotating clip by 180 degree to get the clip3clip2 = clip1.rotate(180).set_start(4) # adding cross fade of 2 seconds in the clip2clip2 = clip2.crossfadein(2.0)  # creating a composite videofinal = CompositeVideoClip([clip1, clip2])  # showing final clipfinal.ipython_display(width = 480)
Output : 
Moviepy - Building video __temp__.mp4.
Moviepy - Writing video __temp__.mp4

                                                                                                                       
Moviepy - Done !
Moviepy - video ready __temp__.mp4
 
Another example 
Python3
# Import everything needed to edit video clipsfrom moviepy.editor import * # loading video gfgclip = VideoFileClip("geeks.mp4")  # getting subclip from itclip1 = clip.subclip(0, 5) # mirroring image according to the y axisclip2 = clip.fx(vfx.mirror_y).set_start(4) # adding cross fade of 2 seconds in the clip2clip2 = clip2.crossfadein(2.0) # creating a composite videofinal = CompositeVideoClip([clip1, clip2])  # showing final clipfinal.ipython_display(width = 480)
Output : 
Moviepy - Building video __temp__.mp4.
MoviePy - Writing audio in __temp__TEMP_MPY_wvf_snd.mp3
                                                                                                                       
MoviePy - Done.
Moviepy - Writing video __temp__.mp4

                                                                                                                       
Moviepy - Done !
Moviepy - video ready __temp__.mp4
 
anikaseth98
Python-MoviePy
Python
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