WinFF is a graphical front-end for the command line video converter, FFmpeg. WinFF can convert multiple files in multiple formats at a time. You can, for example, convert mpeg, flv, and mov fomats into avi format at once. WinFF is available for Debian, Ubuntu, Red-hat based GNU/Linux distributions and Microsoft Windows operating systems.
Install WinFF in Ubuntu
Winff is available in the official repositories of Debian, Ubuntu and its derivatives.
To install WinFF on Ubuntu, simply run:
$ sudo apt-get install winff
How To Use WinFF
Open WinFF interface either from Dash or Menu.
Add some videos by clicking the "Add" button. Select the Output format in the "Convert To" drop-down box and select the desired preset in the "Preset" drop-down box and finally click "Convert" to begin the conversion.
It's that simple! You can also see the preview before convert.