installation:

npm install pam-diff --save

npm install pipe2pam --save

usage:

const P2P = require('pipe2pam');const PamDiff = require('pam-diff');const ChildProcess = require('child_process');const spawn = ChildProcess.spawn;const execFile = ChildProcess.execFile;const params = [    '-loglevel',    'quiet',    /* use hardware acceleration */    '-hwaccel',    'auto', //vda, videotoolbox, none, auto    /* use an artificial video input */    /*'-re',     '-f',     'lavfi',     '-i',     'testsrc=size=1920x1080:rate=15',*/    /* use an rtsp ip cam video input */    '-rtsp_transport',    'tcp',    '-i',    'rtsp://192.168.1.4:554/user=admin_password=pass_channel=1_stream=0.sdp',    /* set output flags */    '-an',    '-c:v',    'pam',    '-pix_fmt',    'rgb24',//rgba, rgb24, gray    '-f',    'image2pipe',    '-vf',    'fps=1,scale=320:180',//1920:1080 scaled down: 400:225, 384:216, 368:207, 352:198, 336:189, 320:180    //'fps=1,scale=iw*1/6:ih*1/6',    '-frames',    '1000',    'pipe:1'];const ffmpeg = spawn('ffmpeg', params);console.log(ffmpeg.spawnargs.join(' '));ffmpeg.on('error', (error) => {    console.log(error);});ffmpeg.on('exit', (code, signal) => {    console.log('exit', code, signal);});const p2p = new P2P();let counter = 0;p2p.on('pam', (data) => {    //you do not have to listen to this event if you are just piping this data to pam-diff    console.log(`received pam ${++counter}`);});const pamDiff = new PamDiff({grayscale: 'average', difference: 5, percent: 5});pamDiff.on('diff', (data) => {    console.log(data);        //comment out the following line if you want to use ffmpeg to create a jpeg from the pam image that triggered an image difference event    if(true){return;}        const date = new Date();    let name = `${date.getUTCFullYear()}-${date.getUTCMonth() + 1}-${date.getUTCDate()}_${date.getHours()}-${date.getUTCMinutes()}-${date.getUTCSeconds()}-${date.getUTCMilliseconds()}`;    for (const region of data.trigger) {        name += `(${region.name}=${region.percent})`;    }    const jpeg = `${name}.jpeg`;    const ff = execFile('ffmpeg', ['-f', 'pam_pipe', '-c:v', 'pam', '-i', 'pipe:0', '-c:v', 'mjpeg', '-pix_fmt', 'yuvj422p', '-q:v', '1', '-huffman', 'optimal', jpeg]);    ff.stdin.end(data.pam);    ff.on('exit', (data) => {        if (data === 0) {            console.log(`FFMPEG clean exit after creating ${jpeg}`);        } else {            throw new Error('FFMPEG is not working with current parameters');        }    });});ffmpeg.stdout.pipe(p2p).pipe(pamDiff);