Node ffmpeg - Square image to video image distortion

Question

I have a problem. I used this code and got a 640x640 video but its converted from a 1280x720 and that's why I get distorted images. What am I doing wrong? I tried different codecs but I have the same problem. (My images res 640x640 )

var proc = new ffmpeg({
            source: './test/' + 0  + '/img%0d.jpg',
            nolog: false
        }).format('mp4')
            .size('640x640')
            .autopad()
            .videoCodec('libx264')

            .videoFilter('zoompan=d=60:');// 
        proc.save(path + 'video' + '.mp4', function (retcode, error) {
            console.log('file has been converted succesfully');
        });

Regards

Answer 1

I found setsar=1 filter :) and problem is resolved