MEncoder

MEncoder is a free software program that allows you to take a video file, or a set of video files, and "encode" or convert them into a different format. This can be useful if you want to watch a video on a device that doesn't support the format you have, or if you want to shrink the size of the video file to save space. It can also be used to speed up or slow down the video. To use MEncoder, you need to have the right type of video file, and you need to know what kind of format you want it to be converted into.