= Mandatory Prerequisites = * GCC, MSVC (9, 10, 11, 12), Xcode or Intel C/C++ * CMake 2.8.8 or later http://www.cmake.org * On linux, ccmake is helpful, usually a package named cmake-curses-gui Note: MSVC12 requires cmake 2.8.11 or later = Optional Prerequisites = 1. Yasm 1.2.0 or later, to compile assembly primitives (performance) For Windows, download http://www.tortall.net/projects/yasm/releases/yasm-1.2.0-win32.exe or http://www.tortall.net/projects/yasm/releases/yasm-1.2.0-win64.exe depending on your O/S and copy the EXE into C:\Windows or somewhere else in your %PATH% that a 32-bit app (cmake) can find it. If it is not in the path, you must manually tell cmake where to find it. For Linux, yasm-1.2.0 is likely too new to be packaged for your system so you will need get http://www.tortall.net/projects/yasm/releases/yasm-1.2.0.tar.gz compile, and install it. Once YASM is properly installed, run cmake to regenerate projects. If you do not see the below line in the cmake output, YASM is not in the PATH. -- Found Yasm 1.2.0 to build assembly primitives Now build the encoder and run x265 -V. If you see "assembly" on this line, you have YASM properly installed: x265 [info]: performance primitives: intrinsic assembly 2. VisualLeakDetector (Windows Only) Download from https://vld.codeplex.com/releases and install. May need to re-login in order for it to be in your %PATH%. Cmake will find it and enable leak detection in debug builds without any additional work. If VisualLeakDetector is not installed, cmake will complain a bit, but it is completely harmless. = Build Instructions Linux = 1. Use cmake to generate Makefiles: cmake ../source 2. Build x265: make Or use our shell script which runs cmake then opens the curses GUI to configure build options 1. cd build/linux ; ./make-Makefiles.bash 2. make = Build Instructions Windows = We recommend you use one of the make-solutions.bat files in the appropriate build/ sub-folder for your preferred compiler. They will open the cmake-gui to configure build options, click configure until no more red options remain, then click generate and exit. There should now be an x265.sln file in the same folder, open this in Visual Studio and build it. = Version number considerations = Note that cmake will update X265_VERSION each time cmake runs, if you are building out of a Mercurial source repository. If you are building out of a release source package, the version will not change. If Mercurial is not found, the version will be "unknown".