This is a FREEWARE, Portable Multimedia Conversion Application based upon the open source ffmpeg library. The original source code for this Visual Basic GUI was written by DaZZa and updated / improved by wsg (Warren S. Goff, DO).
The interface is intuitive and this Animated GIF displays all features and operations:
No further documentation is provided. This has been tested on Windows 7 and XP. Simply extract the zip file into a directory of your choice and run it. There is no need to install it.