MoviePy - 创建视频剪辑

在本文中，我们将了解如何在 MoviePy 中创建视频剪辑。 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。视频是由帧组成的，帧的组合创建一个视频，每一帧都是一个单独的图像。 VideoClip 是 MoviePy 中所有其他视频剪辑的基类。如果您只想编辑视频文件，我们将永远不需要它。当我们想从另一个库生成的帧制作动画时，这个类很实用。我们只需要定义一个函数make_frame(t)，它返回一个 HxWx3 numpy 数组（8 位整数），表示时间 t 的帧。

In order to do this we will use VideoClip method
Syntax : VideoClip(make_frame, duration) 
Argument : It takes method and duration as argument
Return : It returns VideoClip object 
 

下面是实现

Python3

# importing matplotlib and numpy
import matplotlib.pyplot as plt
import numpy as np
 
# importing movie py libraries
from moviepy.editor import VideoClip
from moviepy.video.io.bindings import mplfig_to_npimage
 
# numpy array
x = np.linspace(-2, 2, 200)
 
# matplot subplot
fig, ax = plt.subplots()
duration = 2
 
# method to get frames
def make_frame(t):
     
    # clear
    ax.clear()
     
    # plotting line
    ax.plot(x, np.sin(x + 2 * np.pi / duration * t), lw = 3)
    ax.set_ylim(-1.5, 2.5)
     
    # returning numpy image
    return mplfig_to_npimage(fig)
 
# creating Video Clip
clip = VideoClip(make_frame, duration = 3)
 
# displaying clip
clip .ipython_display(fps = 20, loop = True, autoplay = True)

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

# importing matplotlib and numpy
import matplotlib.pyplot as plt
import numpy as np
 
# importing movie py libraries
from moviepy.editor import VideoClip
from moviepy.video.io.bindings import mplfig_to_npimage
 
# numpy array
x = np.linspace(-4, 4, 100)
 
# matplot subplot
fig, ax = plt.subplots()
 
duration = 2
 
# method to get frames
def make_frame(t):
     
    # clear
    ax.clear()
     
    # plotting line
    ax.plot(x, np.cos(x + 4 * np.pi / duration * t), lw = 3)
    ax.set_ylim(-1.5, 2.5)
     
    # returning numpy image
    return mplfig_to_npimage(fig)
 
# creating Video Clip
clip = VideoClip(make_frame, duration = 3)
 
# displaying clip
clip .ipython_display(fps = 20, loop = True, autoplay = True)

输出 ：

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

                                                                                                                       
Moviepy - Done !
Moviepy - video ready __temp__.mp4