The first you need to do is load the video file. Locate the file button and click "Add.." to add the video file you want to convert.
This is how the main window will look after the video file
is loaded. You should set the output folder (1) and make sure
the video file you want to convert(2). Then click the "Encode" button to continue.
Here we go, it's encoding! You can still have a look in the settings and see if everything is as it should be!
ok, converting is over. you'll have a 3GP video file.