MoviePy – Creating Video Clip

In this article we will see how we can create a video clip in MoviePy. MoviePy is a Python module for video editing, which can be used for basic operations on videos and GIF’s. Video is formed by the frames, combination of frames creates a video each frame is an individual image. VideoClip is the base class for all the other video clips in MoviePy. If all you want is to edit video files, we will never need it. This class is practical when we want to make animations from frames that are generated by another library. All we need is to define a function make_frame(t) which returns a HxWx3 numpy array (of 8-bits integers) representing the frame at time t. 

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 

Below is the implementation 

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)

Output :

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

                                                                                                                       
Moviepy - Done !
Moviepy - video ready __temp__.mp4

Another example 

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)

Output :

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

                                                                                                                       
Moviepy - Done !
Moviepy - video ready __temp__.mp4