MoviePy 复合视频 - 添加交叉淡入淡出效果

在本文中，我们将了解如何在 MoviePy 中的复合视频文件中添加交叉淡入淡出效果。 MoviePy 是一个用于视频编辑的Python模块，可用于视频和 GIF 的基本操作。复合的含义是组合不同的元素，复合视频是不同视频片段的组合，不像视频文件的堆叠和串联，复合文件易于实现但结构复杂。复合文件将剪辑相互组合并同时播放，可以随时设置视频播放的位置和时间。设置了交叉淡入淡出效果，以便在剪辑更改时发生平滑过渡。交叉淡入淡出是指在电影或广播或电视节目中淡入（声音或图像），同时淡出另一个声音或图像。

In order to do this we will use crossfadein method with the VideoFileClip object
Syntax : clip.crossfadein(n)
Argument : It takes float as argument
Return : It returns VideoFileClip object 
 

下面是实现

Python3

# Import everything needed to edit video clips
from moviepy.editor import *
  
# loading video dsa gfg intro video
clip = VideoFileClip("dsa_geek.webm")
  
# getting only first 5 seconds
clip1 = clip.subclip(0, 5)
  
# rotating clip by 180 degree to get the clip3
clip2 = clip1.rotate(180).set_start(4)
 
# adding cross fade of 2 seconds in the clip2
clip2 = clip2.crossfadein(2.0)
  
# creating a composite video
final = CompositeVideoClip([clip1, clip2])
  
# showing final clip
final.ipython_display(width = 480)

输出 ：

Moviepy - Building video __temp__.mp4.
Moviepy - Writing video __temp__.mp4

                                                                                                                       
Moviepy - Done !
Moviepy - video ready __temp__.mp4
 

另一个例子

Python3

# Import everything needed to edit video clips
from moviepy.editor import *
 
# loading video gfg
clip = VideoFileClip("geeks.mp4")
 
 
# getting subclip from it
clip1 = clip.subclip(0, 5)
 
# mirroring image according to the y axis
clip2 = clip.fx(vfx.mirror_y).set_start(4)
 
# adding cross fade of 2 seconds in the clip2
clip2 = clip2.crossfadein(2.0)
 
# creating a composite video
final = CompositeVideoClip([clip1, clip2])
  
# showing final clip
final.ipython_display(width = 480)

输出 ：

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