QWinFF is a GUI for FFmpeg, a powerful command-line media converter. Developed by Timothy Lin
License: Open Source
AutoGK is a user-friendly software primarily focused on video encoding with fast processing speeds, but it lacks some audio support and is not open-source. QWinFF, on the other hand, is an open-source alternative that supports a wider range of formats and offers cross-platform compatibility, but its user interface may not be as intuitive and it is generally slower in processing.