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x265 is a free and open source encoding library and application for encoding HEVC/H.265 video files
Language: English
Ease of use: Not Rated
Latest Version: 2.6 (details)
OS Support: Linux/Unix Mac OS Win32 Command Line Windows Vista Windows 7 Windows 8
License: Open Source
Last Updated:
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x265 is a free and open source encoding library and application for encoding HEVC/H.265 video files.


  • 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

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


OS Compatibility:

Linux/Unix/Mac OS/Win32 Command Line/Windows Vista/Windows 7/Windows 8

Revision History:

Version 2.6
  • Release Date: Nov 30, 2017
  • New features
    • x265 can now refine analysis from a previous HEVC encode (using options --refine-inter, and --refine-intra), or a previous AVC encode (using option --refine-mv-type). The previous encode‚Äôs information can be packaged using the x265_analysis_data_t data field available in the x265_picture object.
    • Basic support for segmented (or chunked) encoding added with --vbv-end that can specify the status of CPB at the end of a segment. String this together with --vbv-init to encode a title as chunks while maintaining VBV compliance!
    • --force-flush can be used to trigger a premature flush of the encoder. This option is beneficial when input is known to be bursty, and may be at a rate slower than the encoder.
    • Experimental feature --lowpass-dct that uses truncated DCT for transformation.
    Encoder enhancements
    • Slice-parallel mode gets a significant boost in performance, particularly in low-latency mode.
    • x265 now officially supported on VS2017.
    • x265 now supports all depths from mono0 to mono16 for Y4M format.
    API changes
    • Options that modified PPS dynamically (--opt-qp-pps and --opt-ref-list-length-pps) are now disabled by default to enable users to save bits by not sending headers. If these options are enabled, headers have to be repeated for every GOP.
    • Rate-control and analysis parameters can dynamically be reconfigured simultaneously via the x265_encoder_reconfig API.
    • New API functions to extract intermediate information such as slice-type, scenecut information, reference frames, etc. are now available. This information may be beneficial to integrating applications that are attempting to perform content-adaptive encoding. Refer to documentation on x265_get_slicetype_poc_and_scenecut, and x265_get_ref_frame_list for more details and suggested usage.
    • A new API to pass supplemental CTU information to x265 to influence analysis decisions has been added. Refer to documentation on x265_encoder_ctu_info for more details.
    Bug fixes
    • Bug fixes when --slices is used with VBV settings.
    • Minor memory leak fixed for HDR10+ builds, and default x265 when pools option is specified.
    • HDR10+ bug fix to remove dependence on poc counter to select meta-data information.
View complete revision history

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