i use moviepy for merge mp3 and mp4 file. it’s working good but the process is so slow. i use multi threads but the main process(merging) is still slow. i search and know that i use ffmpeg but i get error at first try and i cant fix it. so i came back to moviepy and is there any way to speed up this process?

my code is so simple: just read the name of my files and get them and merge mp3 file with mute mp4 files. btw i coded with threading and as i say it have not progress. (Of course, there is a possibility that I don’t drink well with Multi-Thread! God knows!)

import threading
from os import walk
from moviepy.editor import VideoFileClip, AudioFileClip
from concurrent.futures import ThreadPoolExecutor


def merge_audio_and_video(name):
    print(f"Processing {name}...")
    video = VideoFileClip(name + '.mp4')
    audio = AudioFileClip(name + '.m4a')
    final_video = video.set_audio(audio)
    final_video.write_videofile(
        f'./merge/{name}.mp4', codec="libx264", audio_codec="aac"
    )


filenames = next(walk('.'), (None, None, []))[2]
mp4_files = [file for file in filenames if file.endswith('.mp4')]
mp4_files_without_extension = [file.replace('.mp4', '') for file in mp4_files]

with ThreadPoolExecutor(max_workers=1) as executor:
    futures = [executor.submit(merge_audio_and_video, name)
               for name in mp4_files_without_extension]

    for future in futures:
        future.result() 
print("All video files have been processed.")