opencv · pratham-mcw · Apr 8, 2026
diff --git a/ffmpeg/build_via_docker.sh b/ffmpeg/build_via_docker.sh
@@ -1,6 +1,7 @@
 #!/bin/bash -e
 cd "$( dirname "${BASH_SOURCE[0]}" )"
-
+export MSYS_NO_PATHCONV=1
+export MSYS2_ARG_CONV_EXCL="*"
 # Build Docker image
 docker build -t opencv_ffmpeg_mingw_build_ubuntu2014 docker
 

diff --git a/ffmpeg/build_videoio_plugin.sh b/ffmpeg/build_videoio_plugin.sh
@@ -28,7 +28,7 @@ OPENCV_CMAKE_ARGS=(
 )
 
 OPENCV_PLUGIN_CMAKE_ARGS=(
-  "-DCMAKE_MODULE_LINKER_FLAGS=-static -lbcrypt -static-libgcc -static-libstdc++ -Wl,--gc-sections -Wl,-Bsymbolic"
+  -DCMAKE_MODULE_LINKER_FLAGS="-lbcrypt -Wl,/OPT:REF -Wl,/OPT:ICF"
   -DCMAKE_BUILD_TYPE=Release
   -DOPENCV_PLUGIN_MODULE_PREFIX=
   -DOPENCV_FFMPEG_SKIP_DOWNLOAD=ON
@@ -80,6 +80,53 @@ build_plugin_64()
 )
 }
 
+build_opencv_arm64()
+{
+(
+  [[ -n "${CLEAN_BUILD_DIR}" ]] && {
+    rm -rf ${BUILD_DIR}/opencv_arm64
+  }
+
+  mkdir -p ${BUILD_DIR}/opencv_arm64
+  pushd ${BUILD_DIR}/opencv_arm64
+  rm -rf CMake* || true
+
+  set -e
+  set -x
+
+  cmake -GNinja \
+  -DCMAKE_TOOLCHAIN_FILE=$CURRENT_DIR/llvm-toolchain-arm64.cmake \
+  "${OPENCV_CMAKE_ARGS[@]}" -DENABLE_FP16=OFF \
+  /build/opencv
+
+  ninja opencv_modules -j${CPU_COUNT}
+  popd
+)
+}
+
+build_plugin_arm64()
+{
+(
+  rm -rf ${BUILD_DIR}/opencv_ffmpeg_plugin_arm64
+  mkdir -p ${BUILD_DIR}/opencv_ffmpeg_plugin_arm64
+  pushd ${BUILD_DIR}/opencv_ffmpeg_plugin_arm64
+
+  set -e
+  set -x
+  PKG_CONFIG_PATH=${BUILD_DIR}/ffmpeg_arm64/install/lib/pkgconfig \
+  RCFLAGS=-DFFMPEG_INTERNAL_NAME=opencv_videoio_ffmpeg_arm64 \
+  cmake -GNinja \
+      -DCMAKE_TOOLCHAIN_FILE=$CURRENT_DIR/llvm-toolchain-arm64.cmake \
+      -DOpenCV_DIR=${BUILD_DIR}/opencv_arm64 \
+      -DCMAKE_SHARED_LINKER_FLAGS="-lucrt" \
+      "${OPENCV_PLUGIN_CMAKE_ARGS[@]}"
+  ninja -v
+  ninja install/strip
+  strings ./opencv_videoio_ffmpeg_64.dll | grep '/src/' | grep opencv | uniq
+  popd
+)
+}
+
 build_opencv_32()
 {
 (
@@ -122,7 +169,7 @@ build_plugin_32()
 )
 }
 
-DEFAULT_TASKS=${1:-build_opencv_64 build_plugin_64 build_opencv_32 build_plugin_32}
+DEFAULT_TASKS=${1:-build_opencv_arm64 build_plugin_arm64}
 for t in $DEFAULT_TASKS $@; do
   echo "Task: $t"
   $t

diff --git a/ffmpeg/docker/Dockerfile b/ffmpeg/docker/Dockerfile
@@ -1,11 +1,16 @@
-FROM ubuntu:20.04
+FROM ubuntu:22.04
+ARG APP_UID=500
+ARG APP_GID=500
+
+ENV APP_UID=$APP_UID
+ENV APP_GID=$APP_GID
 
 RUN \
   apt-get update && \
   DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
     build-essential pkg-config \
     software-properties-common \
-    curl git man mc vim nano rsync \
+    curl git man mc vim nano rsync file wget perl dos2unix python3 python-is-python3 \
     && \
   rm -rf /var/lib/apt/lists/*
 
@@ -19,8 +24,19 @@ RUN \
 RUN \
   apt-get update && \
   DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
-    mingw-w64 g++-mingw-w64-x86-64 g++-mingw-w64-i686 yasm nasm \
+    clang lld llvm \
+    yasm nasm \
     && \
   rm -rf /var/lib/apt/lists/*
 
-CMD ["/app/docker/entry.sh"]
+RUN \
+  wget https://github.com/mstorsjo/llvm-mingw/releases/download/20251202/llvm-mingw-20251202-ucrt-ubuntu-22.04-aarch64.tar.xz && \
+  tar -xf llvm-mingw-20251202-ucrt-ubuntu-22.04-aarch64.tar.xz -C /opt && \
+  mv /opt/llvm-mingw-* /opt/llvm-mingw && \
+  rm llvm-mingw-20251202-ucrt-ubuntu-22.04-aarch64.tar.xz
+
+ENV PATH="/opt/llvm-mingw/bin:${PATH}"
+
+COPY entry.sh /app/docker/entry.sh
+RUN chmod +x /app/docker/entry.sh
+# CMD [".","app/docker/entry.sh"]
diff --git a/ffmpeg/make_mingw.sh b/ffmpeg/make_mingw.sh
@@ -20,11 +20,6 @@ CPU_COUNT=$(nproc || echo 4)  # use OPENCV_FFMPEG_DOCKER_EXTRA_ARGS="--cpuset-cp
 libvpx_DIR=${BUILD_DIR}/libvpx
 libvpx_x86_DIR=${BUILD_DIR}/libvpx_x86
 libvpx_x64_DIR=${BUILD_DIR}/libvpx_x64
-libvpx_configure_OPTIONS="--disable-examples --disable-unit-tests --disable-install-bins --disable-docs --disable-shared --enable-static --enable-vp8 --enable-vp9 --disable-multithread"
-if [ ! -d ${libvpx_DIR} ]; then
-  echo "Libvpx source tree is not found"
-  exit 1
-fi
 #[ -d ${libvpx_x86_DIR} ] ||
 (
 cd ${libvpx_DIR}
@@ -46,13 +41,44 @@ make -j ${CPU_COUNT}
 make install
 )
 
-## Open264
-
-openh264_DIR=${BUILD_DIR}/openh264
-if [ ! -d ${openh264_DIR} ]; then
-  echo "OpenH264 source tree is not found"
+libvpx_ARM64_DIR=${BUILD_DIR}/libvpx_ARM64
+libvpx_configure_OPTIONS="--disable-examples --disable-unit-tests --disable-install-bins --disable-docs --disable-shared --enable-static --enable-vp8 --enable-vp9 --disable-multithread"
+if [ ! -d ${libvpx_DIR} ]; then
+  echo "Libvpx source tree is not found"
   exit 1
 fi
+#[ -d ${libvpx_ARM64_DIR} ] ||
+(
+cd /tmp
+wget https://github.com/mstorsjo/llvm-mingw/releases/download/20251202/llvm-mingw-20251202-ucrt-ubuntu-22.04-aarch64.tar.xz
+mkdir -p /app/llvm-mingw
+tar -xf llvm-mingw-20251202-ucrt-ubuntu-22.04-aarch64.tar.xz -C /app/llvm-mingw --strip-components=1
+cd ${libvpx_DIR}
+mkdir -p ${libvpx_ARM64_DIR}
+rsync -a ./ ${libvpx_ARM64_DIR} --exclude .git
+find ${libvpx_ARM64_DIR} -type f \( -name "*.pl" -o -name "*.c" -o -name "*.h" \) -exec dos2unix {} \;
+
+cd ${libvpx_ARM64_DIR}
+export PATH=/app/llvm-mingw/bin:$PATH
+export CROSS_PREFIX=aarch64-w64-mingw32-
+export CC="${CROSS_PREFIX}gcc"
+export CXX="${CROSS_PREFIX}g++"
+export AR="${CROSS_PREFIX}ar"
+export RANLIB="${CROSS_PREFIX}ranlib"
+export STRIP="${CROSS_PREFIX}strip"
+
+CROSS=aarch64-w64-mingw32- ./configure \
+    --target=arm64-win64-gcc \
+    --disable-runtime-cpu-detect \
+    ${libvpx_configure_OPTIONS} \
+    --prefix=${libvpx_ARM64_DIR}/install
+
+make -j ${CPU_COUNT}
+make install
+)
+
+## Open264
+
 openh264_x86_DIR=${openh264_DIR}/install_x86
 openh264_x86_64_DIR=${openh264_DIR}/install_x86_64
 (
@@ -106,16 +132,53 @@ Cflags: -I${CURRENT_DIR}/openh264_wrapper -I\${prefix} -I\${includedir}
 EOF
 )
 
-## AOM: https://aomedia.googlesource.com/aom
-
-AOM_DIR=${BUILD_DIR}/aom
-if [ ! -d ${AOM_DIR} ]; then
-  echo "AOM source tree is not found"
+openh264_DIR=${BUILD_DIR}/openh264
+if [ ! -d ${openh264_DIR} ]; then
+  echo "OpenH264 source tree is not found"
   exit 1
 fi
+openh264_ARM64_DIR=${openh264_DIR}/install_arm64
+# ARM64 OpenH264 wrapper
+(
+  cd /tmp
+  wget https://github.com/mstorsjo/llvm-mingw/releases/download/20251202/llvm-mingw-20251202-ucrt-ubuntu-22.04-aarch64.tar.xz
+  mkdir -p /app/llvm-mingw
+  tar -xf llvm-mingw-20251202-ucrt-ubuntu-22.04-aarch64.tar.xz -C /app/llvm-mingw --strip-components=1
+  export PATH=/app/llvm-mingw/bin:$PATH
+  export CC=aarch64-w64-mingw32-gcc
+  export CXX=aarch64-w64-mingw32-g++
+  export AR=aarch64-w64-mingw32-ar
+  export RANLIB=aarch64-w64-mingw32-ranlib
+ cd ${openh264_DIR}
+ if [[ "${BUILD_SKIP_DOWNLOAD_SOURCES}" == "" ]]; then
+  make PREFIX=${openh264_ARM64_DIR} install-headers
+ else
+  PREFIX=${openh264_ARM64_DIR}
+  mkdir -p ${PREFIX}/include/wels
+  install -m 644 ${openh264_DIR}/codec/api/svc/codec*.h ${PREFIX}/include/wels
+ fi
+ mkdir -p ${openh264_ARM64_DIR}/lib/pkgconfig
+ aarch64-w64-mingw32-gcc -m64 -O2 -I${CURRENT_DIR}/openh264_wrapper -I${openh264_ARM64_DIR} \
+  -c ${CURRENT_DIR}/openh264_wrapper/wels/openh264_wrapper.c -o ${openh264_ARM64_DIR}/lib/openh264_wrapper.o
+ aarch64-w64-mingw32-ar rcs ${openh264_ARM64_DIR}/lib/libopenh264_wrapper.a ${openh264_ARM64_DIR}/lib/openh264_wrapper.o
+
+ cat >${openh264_ARM64_DIR}/lib/pkgconfig/openh264.pc << EOF
+prefix=${openh264_ARM64_DIR}
+includedir=\${prefix}/include
+
+Name: OpenH264
+Description: OpenH264 wrapper with dynamic loading
+Version: 1.8
+Libs: -L\${prefix}/lib -lopenh264_wrapper
+Libs.private:
+Cflags: -I${CURRENT_DIR}/openh264_wrapper -I\${prefix} -I\${includedir}
+EOF
+)
+
+## AOM: https://aomedia.googlesource.com/aom
+
 AOM_X86_DIR=${BUILD_DIR}/aom_x86
 AOM_X64_DIR=${BUILD_DIR}/aom_x64
-AOM_CONFIGURE_OPTIONS="-DENABLE_TESTS=OFF -DENABLE_EXAMPLES=OFF -DENABLE_TOOLS=OFF -DENABLE_DOCS=OFF -DCONFIG_MULTITHREAD=1 -DCONFIG_AV1_ENCODER=1"
 (
   mkdir -p "${AOM_X86_DIR}"
   cd "${AOM_X86_DIR}"
@@ -125,7 +188,33 @@ AOM_CONFIGURE_OPTIONS="-DENABLE_TESTS=OFF -DENABLE_EXAMPLES=OFF -DENABLE_TOOLS=O
 (
   mkdir -p "${AOM_X64_DIR}"
   cd "${AOM_X64_DIR}"
-  cmake -GNinja -DAOM_TARGET_CPU=generic -DCMAKE_TOOLCHAIN_FILE=${AOM_DIR}/build/cmake/toolchains/x86_64-mingw-gcc.cmake -DCMAKE_INSTALL_PREFIX=${AOM_X64_DIR}/install ${AOM_CONFIGURE_OPTIONS} ${AOM_DIR}
+  cmake -GNinja -DAOM_TARGET_CPU=generic \
+  -DCMAKE_TOOLCHAIN_FILE=${AOM_DIR}/build/cmake/toolchains/x86_64-mingw-gcc.cmake \
+  -DCMAKE_INSTALL_PREFIX=${AOM_X64_DIR}/install ${AOM_CONFIGURE_OPTIONS} ${AOM_DIR}
+  cmake --build . --target install
+)
+AOM_DIR=${BUILD_DIR}/aom
+if [ ! -d ${AOM_DIR} ]; then
+  echo "AOM source tree is not found"
+  exit 1
+fi
+AOM_ARM64_DIR=${BUILD_DIR}/aom_arm64
+AOM_CONFIGURE_OPTIONS="-DENABLE_TESTS=OFF -DENABLE_EXAMPLES=OFF -DENABLE_TOOLS=OFF -DENABLE_DOCS=OFF -DCONFIG_MULTITHREAD=1 -DCONFIG_AV1_ENCODER=1"
+(
+  cd /tmp
+  wget https://github.com/mstorsjo/llvm-mingw/releases/download/20251202/llvm-mingw-20251202-ucrt-ubuntu-22.04-aarch64.tar.xz
+  mkdir -p /app/llvm-mingw
+  tar -xf llvm-mingw-20251202-ucrt-ubuntu-22.04-aarch64.tar.xz -C /app/llvm-mingw --strip-components=1
+  export PATH=/app/llvm-mingw/bin:$PATH
+  export CC=aarch64-w64-mingw32-gcc
+  export CXX=aarch64-w64-mingw32-g++
+  export AR=aarch64-w64-mingw32-ar
+  export RANLIB=aarch64-w64-mingw32-ranlib
+  mkdir -p "${AOM_ARM64_DIR}"
+  cd "${AOM_ARM64_DIR}"
+  cmake -GNinja -DAOM_TARGET_CPU=generic \
+        -DCMAKE_TOOLCHAIN_FILE=${AOM_DIR}/build/cmake/toolchains/arm64-mingw-gcc.cmake \
+        -DCMAKE_INSTALL_PREFIX=${AOM_ARM64_DIR}/install ${AOM_CONFIGURE_OPTIONS} ${AOM_DIR}
   cmake --build . --target install
 )
 
@@ -139,7 +228,6 @@ fi
 
 FFMPEG_x86_DIR=${BUILD_DIR}/ffmpeg_x86
 FFMPEG_x86_64_DIR=${BUILD_DIR}/ffmpeg_x86_64
-FFMPEG_CONFIGURE_OPTIONS="--pkg-config=pkg-config --enable-static --enable-avresample --enable-w32threads --enable-libopenh264 --enable-libvpx --disable-filters --disable-bsfs --disable-programs --disable-debug --disable-cuda --disable-cuvid --disable-nvenc --enable-libaom"
 #[ -d ${FFMPEG_x86_DIR} ] ||
 (
  cd ${FFMPEG_DIR}
@@ -159,5 +247,27 @@ FFMPEG_CONFIGURE_OPTIONS="--pkg-config=pkg-config --enable-static --enable-avres
  make -j${CPU_COUNT} install
 )
 
+FFMPEG_ARM64_DIR=${BUILD_DIR}/ffmpeg_arm64
+FFMPEG_CONFIGURE_OPTIONS="--pkg-config=pkg-config --enable-static --enable-avresample --enable-w32threads --enable-libopenh264 --enable-libvpx --disable-filters --disable-bsfs --disable-programs --disable-debug --disable-cuda --disable-cuvid --disable-nvenc --enable-libaom"
+#[ -d ${FFMPEG_ARM64_DIR} ] ||
+(
+  cd /tmp
+  wget https://github.com/mstorsjo/llvm-mingw/releases/download/20251202/llvm-mingw-20251202-ucrt-ubuntu-22.04-aarch64.tar.xz
+  mkdir -p /app/llvm-mingw
+  tar -xf llvm-mingw-20251202-ucrt-ubuntu-22.04-aarch64.tar.xz -C /app/llvm-mingw --strip-components=1
+  export PATH=/app/llvm-mingw/bin:$PATH
+  export CC=aarch64-w64-mingw32-gcc
+  export CXX=aarch64-w64-mingw32-g++
+  export AR=aarch64-w64-mingw32-ar
+  export RANLIB=aarch64-w64-mingw32-ranlib
+  cd ${FFMPEG_DIR}
+  mkdir -p ${FFMPEG_ARM64_DIR}
+  rsync -a ./ ${FFMPEG_ARM64_DIR} --exclude .git
+  cd ${FFMPEG_ARM64_DIR}
+  find . -type f -exec dos2unix {} \;
+  PKG_CONFIG_PATH=${openh264_ARM64_DIR}/lib/pkgconfig:${libvpx_ARM64_DIR}/install/lib/pkgconfig:${AOM_ARM64_DIR}/install/lib/pkgconfig ./configure --enable-cross-compile --arch=aarch64 --target-os=mingw32 --cross-prefix=aarch64-w64-mingw32- ${FFMPEG_CONFIGURE_OPTIONS} --prefix=`pwd`/install
+  make -j${CPU_COUNT} install
+)
+
 ## OpenCV plugins
 ./build_videoio_plugin.sh