Sorry for the GUI ( i know that is annoying to scroll every now and then the window to press the buttons) but i wasn't able to resize the window.
I already asked the original author an help on this ...and hope he have time to do it.
About recording a working combination is :
Container : MP4
Video
Codec : H.264
Costant rate factor : default is 30 but i use also 23 (is less quality but good enough and can get more fps)
Preset : Superfast ( the resulting video will be more big...but again more speed)
Recording audio is working only is you use the internal mic..i want able to find a working way to record the output of the Alsa ( i also tried Loopback but nothing)