x264 is a free library for encoding H264/AVC video streams. The code is written from scratch by Laurent Aimar, Loren Merritt, Eric Petit (OS X), Min Chen (vfw/asm), Justin Clay (vfw), Mans Rullgard, Radek Czyz, Christian Heine (asm), Alex Izvorski, and Alex Wright. It is released under the terms of the GPL license.
Encoder features: • CAVLC/CABAC • Multi-references • Intra: all macroblock types (16x16, 8x8, and 4x4 with all predictions) • Inter P: all partitions (from 16x16 down to 4x4) • Inter B: partitions from 16x16 down to 8x8 (including skip/direct) • Ratecontrol: constant quantizer, single or multipass ABR, optional VBV • Scene cut detection • Adaptive B-frame placement • B-frames as references / arbitrary frame order • 8x8 and 4x4 adaptive spatial transform • Lossless mode • Custom quantization matrices • Parallel encoding on multiple CPUs • Interlacing
