Convert directory of files with ffmpeg

_README.md

Converts a directory of low bitrate mp4 audio files to window media audio with ffmpeg.

This is a quick conversion for my car's CD player as it doesn't support mp4.

convert.py

import json
import os
import re

rename_command = \
    "ffmpeg -nostats -loglevel 0 -i {mp4} -codec:a wmav2 -b:a 64k {wma}"
root_path = "."
dest_path = "converts"

root_re = re.escape(root_path)
dest_re = re.escape(dest_path)

for root, dirs, files in os.walk(root_path):
    path = root.split(os.sep)
    for f in files:
        if(f.endswith('.mp4')):
            mp4_fn = os.path.join(root, f)
            wma_fn = re.sub(r"^{}(.*)(\.mp4)$".format(root_re),
                            r"{}\1.wma".format(dest_re),
                            mp4_fn)
            if(not os.path.isfile(wma_fn)):
                cmd = rename_command.format(
                    mp4=json.dumps(mp4_fn),
                    wma=json.dumps(wma_fn),
                )
                if not os.path.isdir(os.path.dirname(wma_fn)):
                    os.makedirs(os.path.dirname(wma_fn))
                print("generating {}".format(wma_fn))
                os.system(cmd)
            else:
                print("wma exists skipping {}".format(wma_fn))