x264 is a
free software library for encoding
H.264/MPEG-4 AVC video streams. Written from scratch by Loren Merritt, Laurent Aimar, Eric Petit, Min Chen, Justin Clay, Måns Rullgård, Radek Czyz, Alex Izvorski, Alex Wright, and Christian Heine, it is released under the terms of the
GNU General Public License.
See more at Wikipedia.org...