microphone to spectrogram to phash realtime using ffmpeg and nodejs

index.js

import Pipe2Pam  from 'pipe2pam';
import process from 'node:process';

import  {spawn}   from 'child_process';
import imghash from 'imghash';

let counter = 0;

const params = [
    '-loglevel',
    'quiet',
	'-f',
	'pulse',
	'-i', 
	'default',  
	'-filter_complex',
	'[0:a]showspectrum=s=32x32:mode=combined:slide=scroll:saturation=0.2:scale=log,format=gray[v]',
	'-map', 
	'[v]',
    '-c:v',
    'pam',
	'-r','10',
    '-f',
    'image2pipe',
    '-pix_fmt',
    //'rgb24',
    //'rgba',
    'gray',
    //'monob',
    'pipe:1'
];

const pipe2pam = new Pipe2Pam();

pipe2pam.on('data', (data) => {
	const d = { width:data.width , height: data.height, data: data.pixels }
	const h = imghash.hashRaw(d, 8)
	process.stdout.write(h+"\n")
});

const ffmpeg = spawn('ffmpeg', params);

ffmpeg.on('error', (error) => {
    console.log(error);
});

ffmpeg.on('exit', (code, signal) => {
    console.log('exit', code, signal);
});

ffmpeg.stdout.pipe(pipe2pam);