from moviepy.editor import *
import os
L = []
path = "/home/wanghc/output1/001020210507185532"
for root ,dirs,files in os.walk(path):
    files.sort()
    for file in files:
        if os.path.splitext(file)[1] == ".mp4":
            filepath = os.path.join(root,file)
            video = VideoFileClip(filepath)
            L.append(video)
final_clip = concatenate_videoclips(L)
final_clip.to_videofile(os.path.join(path,"result.mp4"),fps= 25,remove_temp=False)