Speed Up Video 2x faster

speedup_video.py

import os
from os import listdir
from os.path import isfile, join

current_dir = os.getcwd()
output_dir = os.path.join(current_dir, "out")
try:
    os.makedirs(output_dir)
except:
    pass
only_files = [f for f in listdir(current_dir) if isfile(join(current_dir, f))]
for file in only_files:
    if file[-3:] == "mp4":
        mp4_file_path = join(current_dir, file)
        speedup_file_name = f'2x_{file}'
        speedup_file_path = join(output_dir, speedup_file_name)
        # ffmpeg -i input.mp4 -filter:v "setpts=0.5*PTS" -filter:a "atempo=2.0" output.mp4
        convert_command = f'ffmpeg -i {mp4_file_path} -filter:v "setpts=0.5*PTS" -filter:a "atempo=2.0" {speedup_file_path}'
        os.system(convert_command)