x264 - a free h264/avc encoder
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), M Rullg, Radek Czyz, Christian Heine (asm), Alex Izvorski, and Alex Wright. It is released under the terms of the GPL license.
Development status
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
Getting x264
The latest x264 source code can always be found by anonymous SVNrepository:
# svn co svn://svn.videolan.org/x264/trunk x264
Or grab a daily tarball.
Unofficial builds for Windows are available from Jarod or Sharktooth.
Support
For support information and to ask questions, you have the following possibilities:
A mailing list (x264-devel), a forum (Doom9), and IRC (#x264@freenode).
Bugs
Please report any bugs to the mailing list. If it is a crash, then compile x264 with `./configure --enable-debug` and follow the ffmpeg bugreporting guidelines.
Software using x264
- Avidemux
- ELDER
- ffdshow
- ffmpeg
- GordianKnot
- Handbrake: a multi-platform, multithreaded DVD to MPEG-4 ripper/converter.
- LiVES
- MeGUI
- MEncoder
- pspVideo9
- RealAnime
- StaxRip
- TCVP
- VLC media player: a cross-platform video player and streaming solution.
People using x264
If you use x264 in another project, let us know !
Awards
2005 December 26 -- x264 won Doom9's 2005 codec shoot-out, passing Ateme by a hair.
2005 December 12 -- x264 tied for 1st place (with Ateme) in the second annual MSU MPEG-4 AVC/ H.264 codecs comparison.
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