WinFF is a graphical user interface for FFmpeg. It will convert almost any video file that FFmpeg will convert. WinFF does multiple files in multiple formats at one time. You can, for example, convert mpeg's, flv's, and mov's into avi's (or DVD/VCD format or MPEG or 3gp etc.) all at once.
Users usually want to install the winff package and let their package manager decide which winff variant to use. If you want to override the packager's choice, you can additionally select the required variant. This package provides the GTK+ variant of winff.