# libde265 **Repository Path**: OpenMedia/libde265 ## Basic Information - **Project Name**: libde265 - **Description**: No description available - **Primary Language**: Unknown - **License**: MIT - **Default Branch**: master - **Homepage**: None - **GVP Project**: No ## Statistics - **Stars**: 0 - **Forks**: 0 - **Created**: 2026-09-23 - **Last Updated**: 2026-09-23 ## Categories & Tags **Categories**: Uncategorized **Tags**: None ## README libde265 - open h.265 codec implementation ========================================== ![libde265](libde265.png) libde265 is an open source implementation of the h.265 video codec. It is written from scratch and has a plain C API to enable a simple integration into other software. libde265 supports WPP and tile-based multithreading and includes SSE, AVX2 and AVX-512 optimizations. The decoder includes all features of the Main profile, and it supports Main 10 and the Range Extensions: bit depths from 8 to 16 bit (independently for luma and chroma), the 4:2:0, 4:2:2, 4:4:4 and monochrome chroma formats, and the Range Extensions coding tools. It correctly decodes almost all conformance streams (see [[wiki page](https://github.com/strukturag/libde265/wiki/Decoder-conformance)]). A list of supported features are available in the [wiki](https://github.com/strukturag/libde265/wiki/Supported-decoding-features). For latest news check our website at http://www.libde265.org The library comes with two example programs: - dec265, a simple player for raw h.265 bitstreams. It serves nicely as an example program how to use libde265. - sherlock265, a Qt-based video player with the additional capability to overlay some graphical representations of the h.265 bitstream (like CU-trees, intra-prediction modes). Example bitstreams can be found, e.g., at this site: ftp://ftp.kw.bbc.co.uk/hevc/hm-10.1-anchors/bitstreams/ra_main/ Approximate performance for WPP, non-tiles streams (measured using the `timehevc` tool from [the GStreamer plugin](https://github.com/strukturag/gstreamer-libde265)). The tool plays a Matroska movie to the GStreamer fakesink and measures the average framerate. | Resolution | avg. fps | CPU usage | | ----------------- | -------- | --------- | | [720p][1] | 284 fps | 39 % | | [1080p][2] | 150 fps | 45 % | | [4K][3] | 36 fps | 56 % | Environment: - Intel(R) Core(TM) i7-2700K CPU @ 3.50GHz (4 physical CPU cores) - Ubuntu 12.04, 64bit - GStreamer 0.10.36 [1]: http://trailers.divx.com/hevc/TearsOfSteel_720p_24fps_27qp_831kbps_720p_GPSNR_41.65_HM11_2aud_7subs.mkv [2]: http://trailers.divx.com/hevc/TearsOfSteel_1080p_24fps_27qp_1474kbps_GPSNR_42.29_HM11_2aud_7subs.mkv [3]: http://trailers.divx.com/hevc/TearsOfSteel_4K_24fps_9500kbps_2aud_9subs.mkv Building ======== [![Build Status](https://github.com/strukturag/libde265/workflows/build/badge.svg)](https://github.com/strukturag/libde265/actions) [![Build Status](https://ci.appveyor.com/api/projects/status/github/strukturag/libde265?svg=true)](https://ci.appveyor.com/project/strukturag/libde265) libde265 uses the CMake build system. To compile libde265, run ```` mkdir build cd build cmake .. make ```` libde265 has no dependencies on other libraries, but both optional example programs have dependencies on: - SDL2 (optional for dec265's YUV overlay output), - Qt (required for sherlock265), - libswscale (required for sherlock265 if libvideogfx is not available). - libvideogfx (required for sherlock265 if libswscale is not available, optional for dec265). Libvideogfx can be obtained from http://www.dirk-farin.net/software/libvideogfx/index.html or http://github.com/farindk/libvideogfx Build using cmake ================= cmake scripts to build libde265 and the sample scripts `dec265` and `enc265` are included and can be compiled using these commands: ``` mkdir build cd build cmake .. make ``` You can disable building of the example programs by running `cmake` with 
  -DENABLE_DECODER=off     Do not build the dec265 decoder program.
  -DENABLE_SHERLOCK265=off Do not build the sherlock265 visual inspection program.
Optimized (non-Debug) builds hide all symbols except the public API, which makes the decoder faster and the shared library smaller. The encoder and the internal development tools need the internal symbols, so enabling them keeps everything exported. To export all symbols even from an optimized decoder-only build, run `cmake` with 
  -DFORCE_FULL_VISIBILITY=on
Additional logging information can be turned on and off using these `./configure` flags: 
  -DDE265_LOG_LEVEL={error;info;debug;trace}
Building using vcpkg ==================== You can build and install libde265 using the [vcpkg](https://github.com/Microsoft/vcpkg/) dependency manager: ``` git clone https://github.com/Microsoft/vcpkg.git cd vcpkg ./bootstrap-vcpkg.sh ./vcpkg integrate install ./vcpkg install libde265 ``` The libde265 port in vcpkg is kept up to date by Microsoft team members and community contributors. If the version is out of date, please [create an issue or pull request](https://github.com/Microsoft/vcpkg) on the vcpkg repository. Prebuilt binaries ================= Binary packages can be obtained from this [launchpad site](https://launchpad.net/~strukturag/+archive/libde265). Software using libde265 ======================= Libde265 has been integrated into these applications: - libheif [source](https://github.com/strukturag/libheif) - gstreamer plugin, [source](https://github.com/strukturag/gstreamer-libde265), [binary packages](https://launchpad.net/~strukturag/+archive/libde265). - VLC plugin [source](https://github.com/strukturag/vlc-libde265), [binary packages](https://launchpad.net/~strukturag/+archive/libde265). - Windows DirectShow filters, https://github.com/strukturag/LAVFilters/releases - ffmpeg fork, https://github.com/farindk/ffmpeg - ffmpeg decoder [source](https://github.com/strukturag/libde265-ffmpeg) - libde265.js JavaScript decoder [source](https://github.com/strukturag/libde265.js), [demo](https://strukturag.github.io/libde265.js/). ## Packaging status [![libde265 packaging status](https://repology.org/badge/vertical-allrepos/libde265.svg?exclude_unsupported=1&columns=3&exclude_sources=modules,site&header=libde265%20packaging%20status)](https://repology.org/project/libde265/versions) License ======= The library `libde265` is distributed under the terms of the GNU Lesser General Public License. The sample applications are distributed under the terms of the MIT license. See `COPYING` for more details. The short video clip in the 'testdata' directory is from the movie 'Girl Shy', which is in the public domain. Copyright (c) 2013-2014 Struktur AG
Copyright (c) 2013-2026 Dirk Farin
Contact: Dirk Farin