X264 is an advanced commandline encoder for creating H.264 (MPEG-4 AVC) video streams.

x264 supports the following features: * CABAC (context-based adaptive binary arithmetic coding) and CAVLC (context-based adaptive variable length coding * multiple reference frames * 16x16, 8x8 and 4x4 intra-predicted macroblocks * all P-frame inter-predicted macroblock types * B-Inter-predicted macroblock types from 16x16 down to 8x8 * rate distortion optimization * multiple rate control modes (constant quantizer, constant quality, single or multipass ABR with the option of VBV) * scene cut detection * adaptive B-frame placement, with the option of keeping B-frames as references / arbitrary frame order * 8x8 and 4x4 adaptive spatial transform (high profile) * lossless mode (high 4:4:4 profile) * custom quantization matrices (high profile) * parallel encoding on multiple CPUs * interlaced streams