MediaCoder

Do you have a lot of media files that you need to convert to another format? MediaCoder is a great free transcoder that gives you the possibility to transcode media files. You can convert video and audio files. You can specify your own output parameters, but MediaCoder contains a number of presets for different devices, such as mobile phones, iPod, PSP and more. And, to really make it easy, you can do batch prosessing. A great application I highly recommend!

http://mediacoder.sourceforge.net/