make_mingw.sh

# Libaom
libaom_DIR=${BUILD_DIR}/libaom
libaom_x86_DIR=${BUILD_DIR}/libaom_x86
libaom_x64_DIR=${BUILD_DIR}/libaom_x64
libaom_configure_OPTIONS="-DENABLE_EXAMPLES=OFF -DENABLE_TOOLS=OFF -DCONFIG_UNIT_TESTS=0 -DCONFIG_MULTITHREAD=0"
if [ ! -d ${libaom_DIR} ]; then
  echo "Libaom source tree is not found"
  exit 1
fi
##[ -d ${libaom_x86_DIR} ] ||
#(
cd ${libaom_DIR}
mkdir -p ${libaom_x86_DIR} ${libaom_x86_DIR}/build_output
rsync -a ./ ${libaom_x86_DIR} --exclude .git
cd ${libaom_x86_DIR}/build_output
cmake -DAOM_TARGET_CPU=generic -DCMAKE_TOOLCHAIN_FILE=${libaom_x86_DIR}/build/cmake/toolchains/x86-mingw-gcc.cmake -DCMAKE_INSTALL_PREFIX=${libaom_x86_DIR}/install ${libaom_configure_OPTIONS}  ..
make -j ${CPU_COUNT}
make install
#)
#[ -d ${libaom_x64_DIR} ] ||
(
cd ${libaom_DIR}
mkdir -p ${libaom_x64_DIR} ${libaom_x64_DIR}/build_output
rsync -a ./ ${libaom_x64_DIR} --exclude .git
cd ${libaom_x64_DIR}/build_output
cmake -DAOM_TARGET_CPU=generic -DCMAKE_TOOLCHAIN_FILE=${libaom_x64_DIR}/build/cmake/toolchains/x86_64-mingw-gcc.cmake -DCMAKE_INSTALL_PREFIX=${libaom_x64_DIR}/install ${libaom_configure_OPTIONS}  ..
make -j ${CPU_COUNT}
make install
)

Add --enable-libaom to FFMPEG_CONFIGURE_OPTIONS

Add ffmpeg link directory x86: -L${libaom_x64_DIR}/install/lib
Add ffmpeg link directory x64: -L${libaom_x86_DIR}/install/lib
Add link library x86/x64: bcrypt https://patchwork.ffmpeg.org/patch/8243/

ffmpeg_version.cmake

set(FFMPEG_libpostproc_FOUND 1)
set(FFMPEG_libavcodec_FOUND 1)
set(FFMPEG_libavformat_FOUND 1)
set(FFMPEG_libavutil_FOUND 1)
set(FFMPEG_libswscale_FOUND 1)
set(FFMPEG_libavresample_FOUND 1)

set(FFMPEG_libpostproc_VERSION 55.1.100)
set(FFMPEG_libavcodec_VERSION 58.18.100)
set(FFMPEG_libavformat_VERSION 58.12.100)
set(FFMPEG_libavutil_VERSION 56.14.100)
set(FFMPEG_libswscale_VERSION 5.1.100)
set(FFMPEG_libavresample_VERSION 4.0.0)

download_src.sh

Update ffmpeg to tag n4.0 NB! FFmpeg has dropped support for Windows XP.
Add the following line: update libaom https://aomedia.googlesource.com/aom dev

Probably should wait until they have tagged a new release from master.

Winning

/cc @alalek I have a local build working now and AV1 encoding/decoding is working fine. You should probably wait to include AV1 support until they tag a new version from dev branch though. Just wanted to give you the recipe when you have time to update ffmpeg binaries :)

Uh oh!

AV1 support #11389

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