Use ffmpeg and python to increase volume of some videos and after that concat

ffmpeg_louder_concat.py

import os
from datetime import datetime

# Assuming video files are recorted with OBS in this format: "2023-04-11 08-11-11.mp4"

def parse_date(filepath):
    date_str = filepath[:19]  
    return datetime.strptime(date_str, "%Y-%m-%d %H-%M-%S")

filepaths = [f for f in os.listdir() if f.endswith(".mp4")]

for fname in filepaths: 
    cmd = f'ffmpeg -i "{fname}" -af "volume=20dB" -c:v copy "louder/{fname}"'
    os.system(cmd)

# test and copy files from louder to current vids folder
# then run the concat cell
response = input("test and copy files from louder to current vids folder, Ready? y/n")
if response in ["y", "Y"]:

    sorted_filepaths = sorted(filepaths, key=parse_date)
    sorted_filepaths = [f.replace(" ", "\ ") for f in sorted_filepaths]

    allvids = [f'file {os.path.abspath(f)}' for f in sorted_filepaths]

    with open("vids.txt", "w") as f:
        f.write("\n".join(allvids))

    # cat vids.txt

    os.system("ffmpeg -f concat -safe 0 -i vids.txt -c copy allvids.mp4")