Esta rutina permite comprimir audios y cambiar el formato desde Node.

gistfile1.txt

import ffmpeg from "fluent-ffmpeg";
import { promises as fs } from 'fs';



function convertAudioTo (srcPath:string, fileName:string): Promise<string> {
    
    const ffmpegPath = require('@ffmpeg-installer/ffmpeg').path;
    ffmpeg.setFfmpegPath(ffmpegPath);

    const format = 'ogg';
    const randomName = fileName.split('.')[0];
    const newFile = './uploads/' + randomName + '.' + format;

    // Format	Codec	Bit rate	Sample Rate
    // OGG	    OPUS	256 kpbs	16 kHz, mono

    return new Promise((resolve, reject) => {
        ffmpeg(srcPath)
            .format(format)
            .audioCodec('opus')
            .audioBitrate('256k')
            .audioChannels(1)
            .on('error', async (error) => {
                await fs.unlink(srcPath)
                reject(error||'')
            })
            .on('end', async () => {
                logger.info('Audio convertido en ' + newFile)
                await fs.unlink(srcPath)
                resolve(newFile)
            })
            .save(newFile)
    });
}