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Here are the steps to use ffmpeg to provide a video stream in Node:

1. Install ffmpeg on your system.
2. Install the 'fluent-ffmpeg' package in your Node project using npm.
3. Import the package and create a new ffmpeg object.
4. Set the input source of the ffmpeg object.
5. Set the output format using .format() method.
6. Set the output function to node writable stream.
7. Start the ffmpeg process using the .output() method and the .run() method.

Here is a sample code that demonstrates how to use ffmpeg to provide a video stream in Node:

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

const videoFilePath = '/path/to/video.mp4';

//Create ffmpeg object
const proc = ffmpeg(videoFilePath);

//Set input source
proc.inputFormat('mp4').inputOptions(['-re']).input(videoFilePath);

//Set output format and output stream
const stream = fs.createWriteStream('output.mp4');
proc.format('mp4').output(stream);

//Start ffmpeg process
proc.run();

This code will create a writable stream and set it as the output for the ffmpeg process. The output video will be in the mp4 format. You can change the output format and stream as per your requirements.