convert audio files to mp3 with ffmpeg

anytomp3.js

#!/usr/bin/env node
const path = require('path');
const execSync = require('child_process').execSync;
const {
  which,
  test,
  mkdir,
  ls
} = require('shelljs');

const outputFolderPath = './mp3';

if (!which('ffmpeg')) {
  throw new Error('ffmpeg required');
}

if (test('-e', outputFolderPath) && !test('-d', outputFolderPath)) {
  throw new Error(`Output folder ${outputFolderPath} already exists and is not a directory`)
}

mkdir('-p', outputFolderPath)

ls()
  .filter((filename) => !test('-d', filename))
  .forEach((filename) => {
    const basename = path.basename(filename, path.extname(filename));
    const outputPath = path.join(outputFolderPath, `${basename}.mp3`);
    try {
      execSync(
        `ffmpeg -i "${filename}" -acodec libmp3lame -aq 4 "${outputPath}"`,
        { stdio: 'inherit' }
      );
    }
    catch (ex) {}
  });