How to mirror the video and add wotermark in node js - node.js

Question

I wanted to find it here,but I found a similarity to this,but it wasn't for the node.js
how to mirror + add logo to video?
Here we can see a code:ffmpeg -i input.mp4 -i logo.png -filter_complex "hflip[flipped];[flipped]overlay=x=10:y=10" out.mp4
But i didn't understand how i can use it in Node.js
Please,help

Answer 1

you'll need to spawn FFMPEG from your node app:
var spawn = require('child_process').spawn;
var ffmpeg_process, feedStream=false;
var ops = [-i, input.mp4, -i, logo.png, -filter_complex, "hflip[flipped];[flipped]overlay=x=10:y=10", out.mp4];
ffmpeg_process=spawn('ffmpeg', ops);
//in this bit I was writing FFMPEG data to a socket, so I commented out those bits
ffmpeg_process.stderr.on('data',function(d){
//socket.emit('ffmpeg_stderr',''+d);
});
ffmpeg_process.on('error',function(e){
console.log('child process error'+e);
//socket.emit('fatal','ffmpeg error!'+e);
feedStream=false;
//socket.disconnect();
});
ffmpeg_process.on('exit',function(e){
console.log('child process exit'+e);
//socket.emit('fatal','ffmpeg exit!'+e);
//socket.disconnect();
});
a working example can be seen at livestream.a.video. GH: https://github.com/dougsillars/browserLiveStream