QWinFF is written in Qt4/C++ and currently runs on Linux and Windows.
The FFmpeg included in the repository of Ubuntu disables certain formats that are considered restricted due to legal reasons. However, many of these formats are commonly used in exchanging media files. To compensate for these limitations, there's a project named Medibuntu that aims to provide packages that cannot be included in the official repositories of Ubuntu. Now I'll tell you how to download Medibuntu packages to enable the restricted formats in your Ubuntu box.
Install QWinFF in ubuntu
Open the terminal and run the following commands
sudo apt-add-repository ppa:lzh9102/qwinff
sudo apt-get update
sudo apt-get install qwinff