How to convert files with ffmpeg?

I installed ffmpeg and following the example in the docs : https://www.npmjs.com/package/ffmpeg

var ffmpeg = require('ffmpeg');

try {
    var process = new ffmpeg('myfile.gif');
    process.then(function (video) {

        video.save('newfile.mp4', function (error, file) {
            if (!error)
                console.log('Video file: ' + file);
        });

    }, function (err) {
        console.log('Error: ' + err);
    });
} catch (e) {
    console.log(e.code);
    console.log(e.msg);
}

myfile.gif is present in the folder. Im not getting any error logged in the console. No newfile is created. What am I doing wrong? Please help.

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