Almost every single Ubuntu program that has a Graphical User Interface also has its more basic command line version. The GUI wraps around the CLI. The advantage of using the terminal version is that you can "fine tune" the program to do things according to your wishes. Usually, you would want to use Handbrake in the same manner, over and over again. Once you "save" a text file according to your wishes you can just "run" the text file according to the switches you have set. Most of the GUI programs are just "wrappers" that have been put onto the "real" underlying program. In this video I told VLC to open up full screen at half speed without sound, without showing the file name and also told it not to flash a brief on screen message when I change video speed via [ (for slower) and ] (for faster).