x265

Features Overview

• Provides next-generation compression and codec.
• Fast and excellent quality.
• Completly free and libre software, ensuring freedom for everyone.
• The APIs are similar to x264 APIs

Getting x265

Source

The latest x265 source code can always be found by anonymous git repository:

# git clone https://bitbucket.org/multicoreware/x265_git.git

You can browse the source on-line.

Encoder features

• Full prediction and transform quad-tree recursion supported
• Adaptive B-frame placement
• B-frames as references / arbitrary frame order
• CABAC entropy coding
• Intra: all block types (32x32, 16x16, 8x8, 4x4, and PCM with all predictions)
• Inter P: all partitions (from 64x64 down to 8x4)
• Inter B: partitions from 64x64 down to 8x4 (including all merge modes
• and biprediction)
• Weighted prediction for P slices
• Multiple reference frames
• Ratecontrol: constant quantizer, constant quality, single pass ABR, optional VBV
• Scenecut detection
• Parallel encoding on multiple CPUs, both frame-level and wavefront parallelism

Support

For support information and to ask questions, you have the following possibilities:

A mailing list (x265-devel), and IRC (#x265@freenode and #x265dev@freenode).

Bugs

Please report any bugs to the mailing list. If it is a crash, then compile x265 with `./configure --enable-debug` and follow the ffmpeg bugreporting guidelines.

Licensing

In addition to being free to use under the GNU GPL, x265 is also available under a commercial license from MulticoreWare Inc.