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ffmpegX a VCD, SVCD, CVD, VOB, DivX, XviD encoder for Mac OSX
Wraps all those nice Open Source audio and video encoders and players for MacOS X.
From the site:
ffmpegX is a Mac OS X graphic user interface designed to easily operate more than 20 powerful Unix open-source video and audio processing tools including ffmpeg the “hyper fast video and audio encoder” (http://ffmpeg.sf.net/), mpeg2enc the open-source mpeg-2 encoder and multiplexer (http://mjpeg.sf.net/MacOS/) and mencoder the mpeg-4 encoder with subtitles support (http://sf.net/projects/mplayerosx).