Convert mkv to mp4

mkv2mp4.py

#!/usr/bin/env python3
"""
mkv2mp4.py

This script needs MKVToolNix and FFmpeg to run
"""

USAGE = 'usage: mkv2mp4.py INPUT'

from pathlib import Path
import subprocess
import sys
import tempfile


if __name__ == "__main__":
    if len(sys.argv) != 2:
        print(f'error: invalid argument(s)', file=sys.stderr)
        print(USAGE, file=sys.stderr)
        sys.exit(1)

    input_path = Path(sys.argv[1]).resolve(strict=True)

    with tempfile.TemporaryDirectory() as temp_dir:
        temp_dir = Path(temp_dir)
        video = temp_dir / 'video'
        audio = temp_dir / 'audio'

        subprocess.run(
            ['mkvextract', str(input_path), 'tracks', f'0:{video}', f'1:{audio}'],
            check=True
        )
        
        subprocess.run(
            ['ffmpeg', '-i', str(video), '-i', str(audio), '-c' , 'copy', f'{input_path.parent / f"{input_path.stem}.mp4"}'],
            check=True
        )