How to change mp3 file to wav file in node.js

Question

I am trying to convert mp3 file to wav file but I am not getting idea how to do that, I tried using fluent-ffmpeg library but I don't know how to use that.

Jejunum

Answer 1

I finally figured it out using 'fluent-ffmpeg' library. Here is my code.

const ffmpeg = require('fluent-ffmpeg');
let track = './source.mp3';//your path to source file

ffmpeg(track)
.toFormat('wav')
.on('error', (err) => {
    console.log('An error occurred: ' + err.message);
})
.on('progress', (progress) => {
    // console.log(JSON.stringify(progress));
    console.log('Processing: ' + progress.targetSize + ' KB converted');
})
.on('end', () => {
    console.log('Processing finished !');
})
.save('./hello.wav');//path where you want to save your file

if you are facing

An error occurred: Cannot find ffmpeg

then add the ffmpeg path in system environment variables. Your VSCode still may dont recognise the ffmpeg command so in that case re-start VSCode.

Jejunum

Im getting error : An error occurred: Cannot find ffmpeg. – Cowart

No error with just var ffmpeg = require('fluent-ffmpeg'); . Only erroring when I use it. – Cowart

make sure ffmpeg is installed in system and executable from everywhere and second thing is make sure that 'fluent-ffmpeg' npm package is also installed in project. – Jejunum

Both are reinstalled. I added the path in System Environment Variables also (for ffmpeg). Now I'm getting error : ` ENOENTspawn C:\ffmpeg\bin\ffmpeg.exe at exports._errnoException (util.js:1022:11) at Process.ChildProcess._handle.onexit (internal/child_process.js:193:32) at onErrorNT (internal/child_process.js:359:16)` – Cowart

ok do one thing just go to console and try to execute some ffmpeg command. Whatever you r telling it should do the work or if can you please show me your source then I can resolve issue. – Jejunum

github.com/fluent-ffmpeg/node-fluent-ffmpeg please refer this link to set properly fluent-ffmpeg library – Jejunum

ffmpeg works from the command .. The issue was .setFfmpegPath("C:\\ffmpeg\\bin\\ffmpeg.exe") Now I am able to convert the file. I am trying to figure out .. how to convert the uploaded file from a form. Can you help please? How to access the file from Multer? – Cowart

Download that file locally somewhere and access it directly it's simple. – Jejunum

Do you want me to give sample code? let me know .. just use request module and download at some destination. – Jejunum

I'll be very grateful if you could give a sample code. I've posted the question #43228100". Please have a look .. I'm very confused as to how to integrate ffmpeg in multer-s3 module. Thanks. – Cowart

Im able to upload the file with multer and convert it with ffmpeg. That part is working. But its only multer and not multer-s3. How can I upload the converted .mp4 to S3? Please help. – Cowart

give me ur email i'll forward you the code to upload to s3 – Jejunum

I replied just check :) – Jejunum

so ffmpeg should be insatlled on the node server!!! is there any other way to solve this?? any library that works without installed extra executable on server? – Ruckman

Answer 2

i am using modules with import not require

also i wanted to use Promises

the code below is based on this answer : https://mcmap.net/q/860945/-how-to-change-mp3-file-to-wav-file-in-node-js

here are the steps i took :

1. run npm i ffmpeg-fluent

2. download ffmpeg : https://ffmpeg.org/download.html

3. unzip the download

4. move the unzipped contents to "C:\Program Files\ffmpeg"

5. add "C:\Program Files\ffmpeg\bin" to the system path

6. restart vs code

7. here was the code :

import ffmpeg from "fluent-ffmpeg";
export async function audio_to_wav(path_input, path_output) {
  await new Promise(async (resolve, reject) => {
    ffmpeg(path_input)
      .toFormat("wav")
      .on("error", (err) => {
        reject(err);
      })
      .on("end", () => {
        resolve();
      })
      .save(path_output);
  });
}

Nephridium