Speed up videos (x20)

speed_up.py

'''
Files are saved in the same folder with suffix *_x<speedup_rate> and MP4 extension (this leads to faster processing)
'''

import os
import glob
import subprocess
from multiprocessing import Pool
import sys

speedup_rate = 20
path_pattern = os.path.expanduser(sys.argv[1] + "/**/*.webm")

def speed_up_file(file_path):
    if f'x{speedup_rate}' in file_path:
        return
    file_name = os.path.basename(file_path)
    folder_name = os.path.dirname(file_path)
    new_file_path = os.path.join(folder_name, file_name.replace(".webm", f"_x{speedup_rate}.mp4"))
    print('new_file_path', new_file_path)
    subprocess.run(f"ffmpeg -i '{file_path}' -filter:v 'setpts={1/speedup_rate}*PTS' -filter:a 'atempo={speedup_rate}' '{new_file_path}'", shell=True, check=True)

file_list = glob.glob(path_pattern, recursive=True)
print(file_list)

pool = Pool(os.cpu_count())
pool.map(speed_up_file, file_list)