Edit audio sample rate, edit tags, change channels, 2-pass encoding (for the optimal results). Change audio/video codec, bitrate, crop (my favourite and one of the important ones if you care about optimizing the output quality and size), and resize (enter values manually). but you gotta respect the way of the Germans. I don't know about the manipulative history.

So all the codecs supported by ffmpeg can be converted using traGtor. As said, this is actually a front-end that uses the ffmpeg multimedia library (one of the most efficient ones as well). In that sense, if you were looking for an easy to use yet powerful multimedia converter that comes with a GUI (hopefully :P) which is written in GTK+, then look no further, I don't know about you, but I've found it. But then again the reason for all those features is actually has nothing to do with the toolkit since it's the ideas and believe systems that define us thus even by a slight change of the 'philosophy' any toolkit can be used to make a very powerful, features-rich application nonetheless. But the point is for good or worse., unlike with Gnome, KDE has a philosophy that make sure the desktop and almost all the other applications come with a lot of options/features by default.

I maybe wrong on this one but I think the origin of the Qt written KDE desktop actually comes from the German programmers.

Best ffmpeg gui windows