MediaCoder - a free universal media transcoder

MediaCoder is a universal media transcoder which nicely integrates most popular audio/video codecs and tools into an all-in-one solution, converting between almost all popular audio/video formats with high performance and a rich adjustable parameters. With a flexible and extendable architecture, new codecs and tools are added in constantly as well as supports for new devices. MediaCoder intends to be the swiss army knife for media transcoding in all time and at this moment, it already has millions of users from 170+ countries all over the planet.

More info: http://mediacoder.sourceforge.net/