[Python] How to concatenate videos in moviepy?

I am trying to use moviepy to generate video with texts. First, I want to show one messages and then another one. In my case I want to show "Dog" for one second and than "Cat Cat". For that I use the following code:

from moviepy.editor import *

def my_func(messeges):

clips = {}
count = 0
for messege in messeges:
count += 1
clips[count] = TextClip(messege, fontsize=270, color='green')
clips[count] = clips[count].set_pos('center').set_duration(1)
clips[count].write_videofile(str(count) + '.avi', fps=24, codec='mpeg4')

videos = [clips[i+1] for i in range(count)]
video = concatenate(videos)
video.write_videofile('test.avi', fps=24, codec='mpeg4')

video = VideoFileClip('test.avi')
video.write_gif('test.gif', fps=24)

if __name__ == '__main__':

ms = []
ms += ['Dog']
ms += ['Cat Cat']
my_func(ms)


This is the result that I get:



Does anybody know why do I have problems with cats?

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