X264 is able to use Periodic Intra Refresh instead of keyframes, which enables each frame to be capped to the same size enabling each slice to be immediately transmitted in a single UDP or TCP packet and on arrival immediately decoded. X264 has SIMD assembly code acceleration on x86, PowerPC (using AltiVec), and ARMv7 (using NEON) platforms. Eighth Annual MSU MPEG-4 AVC/H.264 Video Codec Comparison, 2012.Seventh Annual MSU MPEG-4 AVC/H.264 Video Codec Comparison, 2011.Sixth Annual MSU MPEG-4 AVC/H.264 Video Codec Comparison, 2010.Fifth Annual MSU MPEG-4 AVC/H.264 Video Codec Comparison, 2009.Fourth Annual MSU MPEG-4 AVC/H.264 Video Codec Comparison, 2007.Third Annual MSU MPEG-4 AVC/H.264 Video Codec Comparison, 2006.X264 has won awards in the following codec comparisons: Macroblock-tree rate control, which controls the quality by tracking how often parts of the frame are used for predicting future frames.The complexity is measured using a combination of sum-of-squares optimization (SSD) and sum of absolute transformed differences (SATD). Psychovisual rate–distortion optimization which attempts to maintain a similar complexity.The second mode, a later addition, adapts the strength per frame in an attempt to improve the quality. Adaptive quantisation in two modes using VAQ.X264 contains some psychovisual enhancements which aim to increase the subjective video quality of the encoded video. Further information: H.264/MPEG-4 AVC § Software encoders X264 implements a large number of features compared to other H.264 encoders. The latter is used by many other interfaces, such as HandBrake and FFmpeg. The former is used by many graphical user interfaces, such as Staxrip and MeGUI. X264 provides a command line interface as well as an API.
Today, x264 is primarily developed by Anton Mitrofanov and Henrik Gramner. Later, in 2008, Fiona Glaser joined the project. Loren Merritt then took over development. X264 was originally developed by Laurent Aimar, who stopped development in 2004 after being hired by ATEME. It is released under the terms of the GNU General Public License. X264 is a free and open-source software library and a command-line utility developed by VideoLAN for encoding video streams into the H.264/MPEG-4 AVC video coding format. GPL-2.0-or-later (a proprietary licensing scheme is also available) Encoder for the video coding format H.264 x264
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