convert_aac_to_mp3.js

var fs = require('fs');
var exec = require('child_process').exec;

fs.readdir('.', (err, files) => {
	if (err) throw err;
	var fileList = [];
	files.filter((file) =>  {
		return fs.statSync(file).isFile() && /.*\.m4a$/.test(file)
	}).forEach((file) => {
		file = __dirname + "/" + file
		fileList.push(file);
	});
	console.log(fileList);

	fileList.forEach((file) => {
		outputFilename = file.replace(/m4a$/g, "mp3")
		cmd = "ffmpeg -i \"" + file + "\" -ab 192000 \"" + outputFilename + "\""
		console.log(cmd);
		var result = exec(cmd);
		console.log(result);
	});
});