intro-trim.py

#!/usr/bin/env python3
import subprocess
import os, shutil
directory = '.'
dir_trash = "processed_DELETEME"

if not os.path.isdir(dir_trash):
    os.mkdir(dir_trash)

for filename in os.listdir(directory):
    f = os.path.join(directory, filename)
    # checking if it is a file
    if os.path.isfile(f):
        cmd = 'ffmpeg -ss 00:00:04 -i "' + filename + '" -map 0 -c copy "temp-' + filename + '"'
        print(cmd)
        conversion = subprocess.Popen(cmd,shell=True)
        conversion.wait()
        print("Conversion for " + filename + " finished")
        shutil.move(filename, dir_trash + "/" + filename)
        shutil.move("temp-" + filename, filename)