This page will help Commons users with firefogg, a web-based Theora encoder.
Miro Video Converter FFMPEG Conversion Matrix
FFmpeg customized for broadcast and professional usage.
FFmpeg Little Helper An easy to use FFmpeg code generator
MediaFork is a GPL’d, multiplatform, multithreaded DVD to MPEG-4 ripper/converter, available for Mac OS X, Linux, and Windows. It is based on the source code to HandBrake
marillat ist jetzt debian-multimedia