music-download.js

class Prompt {
  rl;

  constructor() {
    const { stdin: input, stdout: output } = require('node:process');
    const readline = require('node:readline');

    this.rl = readline.createInterface({ input, output });
  }

  ask(prompt) {
    return new Promise(resolve => {
      this.rl.question(prompt, ans => resolve(ans));
    });
  }
}

const ytdl = require("ytdl-core");
const ffmpeg = require('fluent-ffmpeg');
const NodeID3 = require('node-id3')

function download(url) {
  return new Promise(resolve => {
    const video = ytdl(url, { quality: 'highestaudio', })
    video.once("info", e => {
      const cover = e.videoDetails.thumbnails[0];
      const title = e.videoDetails.title;
      const author = e.videoDetails.author;
      console.log({title, author, cover})
      const filename = `${path}/${title}.mp3`;
      ffmpeg(video)
        .audioBitrate(128)
        .save(filename)
        .on('end', () => {
          NodeID3.write({
            artist: author,
            // APIC: cover,
            album: albumName
          }, filename);
          resolve();
        })
    })
    video.on('progress', (chunkLength, downloaded, total) => {
      const percent = downloaded / total;
      console.log(percent)
    });
  });
}

var path, albumName;
async function main() {
  var p = new Prompt();

  path = await p.ask("path: ");
  albumName = await p.ask("name of the album: ");

  var playlist = (await p.ask("url1 url2 url3 ... > ")).split(" ");

  await Promise.all(
    playlist.map(download)
  )

  return;
}

main().then(process.exit)