Mass converter..

#!/usr/bin/env python3

from os import path
from subprocess import run


class VideoConverter:
    def __init__(self, input_directory: str, output_directory: str, output_format: str):
        self.input_directory = input_directory
        self.output_directory = output_directory
        self.output_format = output_format

    def convert_video(self, input_file: str):
        output_file = path.join(self.output_directory, path.basename(input_file))
        command = ["ffmpeg", "-i", input_file, "-c:v", self.output_format, "-c:a", "copy", output_file]
        run(command)


def main():
    input_directory = "/path/to/input/videos"
    output_directory = "/path/to/output/videos"
    output_format = "mp4"

    video_converter = VideoConverter(input_directory, output_directory, output_format)
    for input_file in os.listdir(video_converter.input_directory):
        video_converter.convert_video(path.join(video_converter.input_directory, input_file))


if __name__ == "__main__":
    main()