"AvideMUX is one of the most widely used Video application for
Ubuntu Linux. It allows you to easily cut, filter and encode your
tasks. It supports all the major video formats including AVI, DVD
compatible MPEGfiles, MP4 and ASF, using a variety of codecs.
"These tasks can be automated using projects, job queue and
powerful scripting capabilities. Avidemux is available for Linux,
BSD, Mac OS X and Microsoft Windows under the GNU GPL license."