FFmpeg is a program that can record, convert and stream digital audio and video in numerous formats. Its most widely used to convert video files to the popular FLV format for playback using a Flash video player in a web browser.
By default, DreamHost users have access to a shared installation of FFmpeg in the following directory:
For an overview of FFmpeg, view the man page at the following link.
The following is a very basic example of how to convert an .avi file to an .flv file.
You can run this command on your web server after logging in via SSH:
[server]$ ffmpeg -i inputfile.avi outputfile.flv