HOWTO install and use FFmpeg on Mac OS X Leopard
If you have ever delved into the deep caves of video encoding and transcoding you’ve probably come along FFmpeg, the ’swiss army knife’ of video encoding tools. Basically, FFmpeg is a command-line tool that allows you to convert virtually any video and audio format to another format. That’s very handy if you want to convert your DVD’s to XVID, a movie to a format you can play on your iPod or PSP or a Flash movie you can use on your website without needing to buy the whole Flash software package.