hey all, my computer is currently gone for repair

so I was searching an app for encoding on android

and I found this one

link - https://play.google.com/store/apps/details?id=org.ffmpeg.gui

screen shot - https://files.videohelp.com/u/301063/1.png

this app can do every thing which ffmpeg do

but I can't figure it out that how I can do 2 pass encoding with this app, will any one try and tell me?