how to capture a video using a rtsp link using node.js

Question

i have a rtsp link and i need to in some moments capture few seconds and save that file in my computer like a mp4 file or something like

i tried to use that code but doesnt worked for me

const ffmpeg = require('fluent-ffmpeg');

// RTSP stream URL
const streamUrl = 'mycamlink';

// Output file path
const outputPath = 'output.mp4';

// Create the FFmpeg command
const command = ffmpeg(streamUrl)
  .inputOptions('-rtsp_transport', 'tcp')
  .outputOptions('-c', 'copy')
  .outputOptions('-flags', '+global_header')
  .output(outputPath);

console.log('Recording started.');

// Start recording
command.run();

// Stop recording after 10 seconds
setTimeout(() => {
  command.kill();
  console.log('Recording stopped.');
}, 10000);

that give me this error Error: Cannot find ffmpeg