Using ffmpeg in node, without using fluent-ffmpeg

I am using ffmpeg without using fluent-ffmpeg. I am using 'child_process' from node.

First of all I verified how can I pass more than one arguments to the child process command. and I verified it given below code.

I used copy command like this

cp vid1.mp4 vid2.mp4

which successfully copied vid1 into vid2.

const execFile = require('child_process').execFile;
const child = execFile('cp', ['vid1.mp4', 'vid3.mp4'], (error, stdout, stderr) => {
    if (error) {
        console.error('stderr: =============================', stderr);
        throw error;
    }
    console.log('stdout: ==========================', stdout);
});

console.log('here');

Above code is content of the 'index.js'(default entry point in node). And running this with node . , which copies vid1 into vid3 successfully.

Now, I want to do watermarking to the given video. For that I am using this tutorial. Currently link to the actual tutorial is broken, you can see it here.

This is the command that I am using

ffmpeg -i input.mp4 -i logo.png -filter_complex "overlay=10:10" output.mp4

Now the same command I am using like this ,

const execFile = require('child_process').execFile;

const child = execFile('ffmpeg', ['-i', 'input.mp4' , '-i' , 'logo.png' , '-filter_complex' , '"overlay=10:10"' , 'output.mp4' ], (error, stdout, stderr) => {
    if (error) {
        console.error('stderr: =============================', stderr);
        throw error;
    }
    console.log('stdout: ==========================', stdout);
});

console.log('here');

and I am getting an error , that ,

No such filter: '"overlay' Error initializing complex filters. Invalid argument

/Users/neerpatel/Desktop/testProjects/childProcess/index.js:7 throw error; ^

Error: Command failed: ffmpeg -i input.mp4 -i logo.png -filter_complex "overlay=10:10" output.mp4

You can clearly see that the same command that runs in terminal directly, doesn't work when I pass it in child process. Why does it happen ?

Moreover, I wanted to add tag 'watermarking' , but I can't create tag since my reputation is below 1500. please, someone do it.

UPDATE : I used EXEC , instead of execFile . and it worked like charm, but parent file kept waiting for child process. Child process never returns END signal. and this is my code.

const exec = require('child_process').exec;

const child = exec('ffmpeg -i input.mp4 -i logo.png -filter_complex "overlay=10:10" output.mp4', (error, stdout, stderr) => {
    if (error) {
        console.error('stderr: =============================', stderr);
        throw error;
    }
    console.log('stdout: ==========================', stdout);
});

console.log('here');