Cut 4 seconds of youtube video using Python and ffmpeg

cut_video.py

#!/usr/bin/python
from __future__ import print_function
import os

cur_dir = os.path.dirname(os.path.realpath(__file__))

input_folder = "original_clips/"
output_folder = "output/"

os.system("mkdir " + output_folder)

path_to_input_folder = os.path.join(cur_dir, input_folder)
path_to_output_folder = os.path.join(cur_dir, output_folder)

for file in os.listdir(path_to_input_folder):
    if file.endswith(".mp4"):
        fn = "'" + file + "'"               
        os.system("ffmpeg -i " + path_to_input_folder + fn + 
        	" -vcodec copy -acodec copy -ss 00:00:04 " + path_to_output_folder + fn)

bash version: https://gist.github.com/VityaSchel/7779dea70d0eafa4c5ecc6bf6a970231