iTunes offers the ability to create easily some MP3 files from any kind of audio file. It is available for Mac OS X, Microsoft Windows. In our case, we are going to see the ability of iTunes to encode a WAV audio file into a mp3 audio file.

Anyone who has been trying to encode some audio files knows probably the Audacity. It is a free, open source software for recording and editing sounds. It is available for Mac OS X, Microsoft Windows, GNU/Linux, and other operating systems.

MPEG Streamclip is one of the most COMPLETE and FREE media encoder of the market. You can use it especially to encode your video in .mp4 format with H.264 codec. It works both on a Mac and on PC. Here is a quick demonstration on how to encode a video in .mp4

A great tool for a great browser. If you are using HTML5 and firefox as a browser, you may have heard of this Addon that enable to encode any kind of video onto .ogg format. Without any desktop app to do the conversion, Firefogg will help you in creating an ogg file.