Default how can i record a screen movie? help

hello everyone, i'm trying every day to record the screen of my galaxy s3.... but i can't....

i have got the 4.3 i9300XXUGMK6

some the apps i try are:
screencast- and say "fatal error! something is prevernting screencast from running(..)"
z-screenrecorder pro- if i record for example 10seconds, the app record and i dont why 2mins and 6seconds, and dont record nothing, only lines...
scr pro -the app work, but have got a lot of brakes....

i try too using the sdk, but have brakes too...

so... what can i do more?

thanks