CMakeLists.txt

# Standalone cmake project to build and install ffmpeg dependencies for Scintillator
include(ExternalProject)
cmake_policy(SET CMP0048 NEW)
cmake_minimum_required(VERSION 3.9)

project(ffmpeg-dev VERSION 0.0.1)

set(INSTALL_EXT_DIR "${PROJECT_BINARY_DIR}/install-ext" CACHE PATH "")
file(MAKE_DIRECTORY "${INSTALL_EXT_DIR}")

if(APPLE)
    # TODO: Build parallelism is turned off right now because Travis inconsistently fails builds with too many child
    # processes spawned. So this build is serialized to be more stable. It also means that it is much slower than it needs
    # to be. Find a way to turn it back on.
    set(SCIN_FFMPEG_BUILD make)
else()
    set(SCIN_FFMPEG_BUILD make -j)
endif()

ExternalProject_Add(ffmpeg
    PREFIX ext
    STEP_TARGETS install
    GIT_REPOSITORY ${SCIN_FFMPEG_GIT_REPO}
    GIT_TAG ${SCIN_FFMPEG_GIT_TAG}
    GIT_PROGRESS ON
    UPDATE_COMMAND ""
    BUILD_IN_SOURCE ON
    CONFIGURE_COMMAND ./configure --prefix=${INSTALL_EXT_DIR} --enable-gpl --disable-programs --enable-shared
    BUILD_COMMAND ${SCIN_FFMPEG_BUILD}
    INSTALL_COMMAND make install
)