.kill is not a function

[JulianAa14]

Version information

• fluent-ffmpeg version: 2.1.3
• ffmpeg version: 7.1-essentials_build-www.gyan.dev
• OS: Windows

Code to reproduce

const fs = require('fs');
const ffmpeg = require('fluent-ffmpeg');
const Speaker = require('speaker');

let playing = false;
let ffmpegProcess = null;

function startPlaying(filePath) {
    if (playing) {
        console.log("Audio is already playing.");
        return;
    }

    console.log("Starting playback...");
    playing = true;

    ffmpegProcess = ffmpeg(filePath)
        .audioCodec('pcm_s16le')
        .audioFilters('volume=1')
        .format('wav')
        .pipe(new Speaker(), { end: false });

    ffmpegProcess.on('end', () => {
        console.log("Audio playback finished.");
        playing = false;
    });

    ffmpegProcess.on('error', (err) => {
        console.log("Error occurred during playback: ", err);
        playing = false;
    });
}

function stopPlaying() {
    if (!playing) {
        console.log("No audio is playing.");
        return;
    }

    console.log("Stopping playback...");
    playing = false;

    if (ffmpegProcess) {
        ffmpegProcess.kill('SIGSTOP');
        console.log("FFmpeg process killed.");
    }
}

const filePath = 'intro.mp3';

startPlaying(filePath);

setTimeout(() => {
    stopPlaying();
}, 5000);

Expected results

This should stop the audio, and continue the program.

Observed results

This should stop the audio, but results in a crash, that crashes the full program.

TypeError: ffmpegProcess.kill is not a function
at stopPlaying (C:\Users*\audioplayertest\app.js:44:23)
at Timeout._onTimeout (C:\Users*\audioplayertest\app.js:54:5)
at listOnTimeout (node:internal/timers:581:17)
at process.processTimers (node:internal/timers:519:7)

Node.js v20.17.0