Once it is installed, you will not have to do anymore than right click the videofile you want to convert and you will find new options in the contextual menu. From there, you will be able to convert your files into other video formats thanks to VIDEOzilla.
You can configure format options and convert files choosing your preferences, quality, size,... having a new file which suits your needs.
In addition, it includes a built-in player, so you will not need a third party program to view your transformed videos.
The trial version offers you 9 conversions.