MeGUI is a free and open-source video encoding software that supports multiple codecs and formats, including H.264, MPEG-4, and XviD. It features a powerful and customizable encoding engine, batch processing, and a user-friendly interface that allows for easy configuration and previewing of video files. MeGUI also includes advanced tools for audio and subtitle extraction, as well as post-processing options such as denoising and sharpening.