Concatenate MP4s in the order provided using ffmpeg

concat-mp4.py

#!/usr/bin/env python3

import argparse
import io
import os.path
import re
import subprocess
import tempfile

def merge_videos(inputs, output):
    with tempfile.NamedTemporaryFile(mode="w+", delete=False) as temp:
        for f in inputs:
            path = os.path.abspath(f)
            # Escape single quotes: https://ffmpeg.org/ffmpeg-formats.html#Examples
            path = re.sub(r"'", r"'\''", path)
            print("file '{}'".format(path), file=temp)
    try:
        subprocess.run(["ffmpeg", "-f", "concat", "-safe", "0", "-i", temp.name,
            "-c", "copy", output], check=True)
    finally:
        os.remove(temp.name)

def main():
    parser = argparse.ArgumentParser(description="Concatenates MP4 files")
    parser.add_argument("--output", required=True)
    parser.add_argument("inputs", nargs="+")
    args = parser.parse_args()

    merge_videos(args.inputs, args.output)


if __name__ == "__main__":
    main()