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## Build instructions for ffmpeg

The OVITO package includes binary versions of the ffmpeg libraries licensed under the GNU Lesser General Public License (LGPLv2.1). In accordance with the requirements of this license, this page provides instructions on how to rebuild compatible versions of these libraries from source code.

### Windows

OVITO for Windows includes binaries that have been built from the unmodified sources of ffmpeg 4.2.1. The following commands have been used to generate them:

    # Compiler: Microsoft Visual C++ 2019 (command line tools) + MSYS2 environment
    # Zlib version: 1.2.11
    ./configure \
       --toolchain=msvc \
       --target-os=win64 \
       --arch=x86_64 \
       --disable-programs \
       --disable-static \
       --enable-shared \
       --prefix=../../ffmpeg \
       --extra-cflags=-I$PWD/../zlib/include  \
       --extra-ldflags=-LIBPATH:$PWD/../zlib/lib \
       --enable-zlib \
       --disable-doc \
       --disable-network \
       --disable-debug
    make install

### Linux

OVITO for Linux includes shared libraries that have been built from the unmodified sources of ffmpeg 4.2.1. The following commands have been used to generate them:

    # Build platform: CentOS 6.9
    # Compiler: GCC 7.1 (CentOS devtoolset-7)
    ./configure \
      --enable-pic \
      --enable-shared \
      --disable-static \
      --disable-doc \
      --disable-network \
      --disable-programs \
      --disable-debug \
      --prefix=$HOME/progs/ffmpeg
    make install

### macOS

OVITO for macOS includes shared libraries that have been built from the unmodified sources of ffmpeg 4.2.1. The following commands have been used to generate them:

    export MACOSX_DEPLOYMENT_TARGET=10.12
    ./configure \
      --disable-network \
      --disable-programs \
      --disable-debug \
      --disable-doc \
      --disable-static \
      --enable-shared \
      --prefix=$HOME/progs/ffmpeg
    make install

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