withv2.py

import cv2
import os

import re

def sorted_alphanumeric(data):
    convert = lambda text: int(text) if text.isdigit() else text.lower()
    alphanum_key = lambda key: [ convert(c) for c in re.split('([0-9]+)', key) ] 
    return sorted(data, key=alphanum_key)


image_folder = 'i3'
video_name = 'videoBASE3P.avi'

images = [img for img in sorted_alphanumeric(os.listdir(image_folder)) if img.endswith(".png")]
frame = cv2.imread(os.path.join(image_folder, images[0]))
height, width, layers = frame.shape
#fourcc = cv2.VideoWriter_fourcc(*'mp4v')

video = cv2.VideoWriter(video_name, 0, 30, (width,height))

for image in images:
    video.write(cv2.imread(os.path.join(image_folder, image)))

cv2.destroyAllWindows()
video.release()