Convert a video file's audio so it's Chromecast compatible

cc-audio.py

#!/usr/bin/env python3
#
# License: AGPLv3
# Copyright 2021 Alex DeLorenzo
# Requires Python 3.10+ and ffmpeg
#
from typing import Final
from subprocess import run
from pathlib import Path
from sys import argv
from os import cpu_count
import logging


NEW_SUFFIX: Final[str] = '_castconvert'

MP3_QUALITY: Final[int] = 1  # MP3 V1
THREADS: Final[int] = cpu_count() or 1
CMD_FMT: Final[str] = (
  f'ffmpeg -y -fflags +genpts'
  f' -i "{{orig}}"'
  f' -c:a libmp3lame -q:a {MP3_QUALITY}'
  f' -c:v copy -threads {THREADS}'
  f' "{{new}}"'
)


def convert_audio(vid: Path) -> Path:
  if NEW_SUFFIX in str(vid):
    logging.info(f"Already converted: {vid}")
    return vid

  vid = vid.absolute()
  new_stem: str = vid.stem + NEW_SUFFIX
  new_vid: Path = vid.with_stem(new_stem)
  new_vid = new_vid.absolute()

  if new_vid.exists():
    logging.info(f"Already converted: {new_vid}")
    return new_vid

  cmd: str = CMD_FMT.format(
    orig=vid,
    new=new_vid
  )
  run(cmd, shell=True)

  return new_vid


def main():
  vids: list[str]
  _, *vids = argv

  for vid in vids:
    path = Path(vid)
    new_path = convert_audio(path)
    print(new_path)


if __name__ == "__main__":
  main()