Archival-esque Soundpost Combiner

import subprocess, shlex, re

if __name__ == '__main__':
    file = input("Filename:").replace('"','')
    info = re.search(r'(.+)\[sound=(\S+)\]\.(\S+)', file, flags=re.I)
    original_name = info.group(1).strip()
    url = info.group(2).replace("%2F","/").replace("%3A",":")
    if not re.match("http", url):
        url = r'https://' + url
    video_codec = 'copy' if info.group(3) == 'webm' else r'libaom-av1 -crf 0'
    subprocess.run(shlex.split(r'ffmpeg.exe -i "' + file + r'" -i "' + url + r'" -c:v ' + video_codec + r' -c:a copy -y "' + original_name + r'.mkv"'))