如何平滑和减慢视频

我使用此代码将一批图像转换为视频:-

import cv2
import numpy as np
import glob

img_array = []
for filename in glob.glob('C:/New folder/Images/*.jpg'):
    img = cv2.imread(filename)
    height, width, layers = img.shape
    size = (width,height)
    img_array.append(img)


out = cv2.VideoWriter('project.avi',cv2.VideoWriter_fourcc(*'DIVX'), 15, size)

for i in range(len(img_array)):
    out.write(img_array[i])
out.release()

我想在opencv选项创建慢动作视频。