archive-audio.js

const path = require("path");
const { exec } = require("child_process");

const outputDir = process.env.OUTPUT_DIR;
const inputPath = process.argv[2];
const startTime = process.argv[3];
const endTime = process.argv[4];
const basename = path.basename(inputPath);
const [filename, extension] = basename.split(".");

const now = new Date();
const month = now.getMonth();
const day = now.getDate();
const year = now.getFullYear();
const date = `${year}${month < 10 ? "0" + month : month}${
  day < 10 ? "0" + day : day
}`;

const name = `${date}-${filename}`.replace(/[\s_]/g, "-").toLowerCase();
const newFile = `${outputDir}/${name}`;
const normalizedFile = `${outputDir}/${name}-n`;

const seekStart = startTime ? `-ss ${startTime}` : "";
const seekEnd = endTime ? `-to ${endTime}` : "";

const properties = "-ar 44100 -acodec pcm_s16le";
const trim = `ffmpeg -i "${inputPath}" ${seekStart} ${seekEnd} ${properties} -y "${newFile}.${extension}"`;
const norm = `ffmpeg -i "${newFile}.${extension}" ${properties} -filter:a loudnorm "${normalizedFile}.${extension}"`;
const comp = `ffmpeg -i "${normalizedFile}.${extension}" -vn -f mp3 -ab 256k -ac 2 -ar 44100 "${normalizedFile}.mp3"`;

exec([trim, norm, comp].join(" && "), (err, stdout, stderr) => {
  if (err) {
    console.error(err);
  } else {
    console.log(`stdout: ${stdout}`);
    console.log(`stderr: ${stderr}`);
  }
});