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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: 2.3+8 Nightly (details)
OS Support: Linux/Unix Mac OS Win32 Command Line Windows Vista Windows 7 Windows 8
License: Open Source
Last Updated:
Page Viewed: 34004 times


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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 2.3+8 Nightly
  • Release Date: Feb 21, 2017
    • Ma0 SAO: avoid negative indexes in 'x265_lambda2_tab' table 2017-02-16
    • Gopi Satykrishna Akisetty fix the chroma offset computation for HDR/WCG content 23 hours ago
    • Gopi Satykrishna Akisetty Add Luma and Chroma offsets for HDR/WCG content 2017-02-01
    • Ma0 silence GCC 7 warnings 2017-02-11
    • Ma0 update the year in output stream header 2017-02-11
    • Ma0 CLI: allow Unicode filenames (Windows) for 'scaling-list', 'lambda-file' and 'analysis-file' 2017-02-11
View complete revision history

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Total Ratings: 7


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