diff --git a/.gitignore b/.gitignore
index dcb58ba..62709eb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 build/
 downloads/
+sources/
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..0a0fe18
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,4 @@
+[submodule "opencv"]
+	path = opencv
+	url = ../opencv.git
+	branch = master
diff --git a/build_update.sh b/build_update.sh
new file mode 100755
index 0000000..381445c
--- /dev/null
+++ b/build_update.sh
@@ -0,0 +1,79 @@
+#!/bin/bash -e
+
+if ! git diff-index --quiet HEAD --; then
+  echo "You have uncommited changes. Please commit your changes first"
+  exit 1
+fi
+
+echo "### Update code from OpenCV repository..."
+[[ "${BUILD_SKIP_OPENCV_UPDATE}" == "" ]] &&
+(
+  cd opencv
+  git fetch https://github.com/opencv/opencv.git 4.x
+  if [[ `git merge-base HEAD FETCH_HEAD` != `git rev-parse HEAD` ]]; then
+    echo "OpenCV folder contains changes. Please save your changes and checkout the latest code: $(pwd)"
+    exit 1
+  fi
+  if ! git diff-index --quiet HEAD --; then
+    echo "OpenCV folder contains unsaved changes. Please save (stash) your changes and checkout the latest code: $(pwd)"
+    exit 1
+  fi
+  git checkout -B ffmpeg_update FETCH_HEAD
+)
+OPENCV_HASH=`cd opencv; git rev-parse HEAD`
+echo "### Update code from OpenCV repository... DONE (${OPENCV_HASH})"
+
+if ! git diff-index --quiet HEAD --; then
+  echo "### OpenCV git submodule is updated. Will commit this update..."
+  git commit -am "update OpenCV code"
+  echo "### ... DONE"
+fi
+
+echo "### Build ffmpeg wrapper binaries..."
+(
+  ./ffmpeg/build_via_docker.sh
+)
+echo "### Build ffmpeg wrapper binaries... DONE"
+
+DATE=${DATE:-`date +%Y%m%d`}
+BRANCH=`git rev-parse --abbrev-ref HEAD`
+TARGET_BRANCH="${BRANCH}_${DATE}"
+
+echo "### Commit ffmpeg wrapper binaries to branch ${TARGET_BRANCH}..."
+(
+  ls -l ffmpeg/*.dll
+  git add ffmpeg/opencv_videoio_ffmpeg.dll
+  git add ffmpeg/opencv_videoio_ffmpeg_64.dll
+  git checkout -B ${TARGET_BRANCH}
+  git commit -m "Update ffmpeg binaries (${DATE}-${OPENCV_HASH})"
+)
+HASH=`git rev-parse HEAD`
+echo "### Commit ffmpeg wrapper binaries to branch ${TARGET_BRANCH}... DONE"
+[[ "${BUILD_SKIP_SOURCE_PACKAGE}" == "" ]] &&
+(
+  echo "### Adding ffmpeg wrapper sources to branch ${TARGET_BRANCH}_src ..."
+  git add -fv sources/.
+  git checkout -B ${TARGET_BRANCH}_src
+  git commit -m "src: OpenCV FFmpeg wrapper (${DATE}-${HASH})"
+)
+HASH_SRC=`git rev-parse HEAD`
+
+echo ""
+echo "1) Create pull request to OpenCV 3rdparty binaries repository with branch ${TARGET_BRANCH}"
+echo "2) Create pull request to OpenCV repository:"
+echo "   with updated hashes in <opencv>/3rdparty/ffmpeg/ffmpeg.cmake:"
+HASH_BIN32=($(md5sum ffmpeg/opencv_videoio_ffmpeg.dll))
+HASH_BIN64=($(md5sum ffmpeg/opencv_videoio_ffmpeg_64.dll))
+HASH_CMAKE=($(md5sum ffmpeg/ffmpeg_version.cmake))
+echo ""
+echo "# Binaries branch name: ${TARGET_BRANCH}"
+echo "# Binaries were created for OpenCV: ${OPENCV_HASH}"
+echo "ocv_update(FFMPEG_BINARIES_COMMIT \"${HASH}\")"
+echo "ocv_update(FFMPEG_FILE_HASH_BIN32 \"${HASH_BIN32}\")"
+echo "ocv_update(FFMPEG_FILE_HASH_BIN64 \"${HASH_BIN64}\")"
+echo "ocv_update(FFMPEG_FILE_HASH_CMAKE \"${HASH_CMAKE}\")"
+echo ""
+
+echo "Checkout to branch with scripts only: ${BRANCH} ..."
+git checkout ${BRANCH}
+echo "All is OK"
diff --git a/ffmpeg/archive_src.sh b/ffmpeg/archive_src.sh
new file mode 100755
index 0000000..03f9ac2
--- /dev/null
+++ b/ffmpeg/archive_src.sh
@@ -0,0 +1,41 @@
+#!/bin/bash -ex
+
+rm -rf ../sources
+mkdir -p ../sources
+mkdir -p ../sources/opencv
+mkdir -p ../sources/build/ffmpeg
+mkdir -p ../sources/build/libvpx
+mkdir -p ../sources/build/openh264
+mkdir -p ../sources/build/aom
+
+ARCHIVE_TYPE=tar.xz
+(
+cd ..
+git archive --format=tar HEAD | xz -c - > sources/opencv_ffmpeg.${ARCHIVE_TYPE}
+)
+(
+cd ../opencv
+git archive --format=tar HEAD modules/videoio/src/*ffmpeg*.hpp LICENSE | xz -c - > ../sources/opencv/opencv-videoio-ffmpeg.${ARCHIVE_TYPE}
+)
+(
+cd ../build/ffmpeg
+git archive --format=tar HEAD | xz -c - > ../../sources/build/ffmpeg/ffmpeg-src-$(git describe --tags).${ARCHIVE_TYPE}
+)
+(
+# We use headers for public API only
+cd ../build/openh264
+git archive --format=tar HEAD codec/api/svc LICENSE | xz -c - > ../../sources/build/openh264/openh264-api-headers-$(git describe --tags).${ARCHIVE_TYPE}
+)
+(
+cd ../build/libvpx
+git archive --format=tar HEAD | xz -c - > ../../sources/build/libvpx/libvpx-src-$(git describe --tags).${ARCHIVE_TYPE}
+)
+(
+cd ../build/aom
+git archive --format=tar HEAD | xz -c - > ../../sources/build/aom/aom-src-$(git describe --tags).${ARCHIVE_TYPE}
+)
+
+find ../sources/
+
+echo "Archiving sources: DONE"
+exit 0
diff --git a/ffmpeg/build_via_docker.sh b/ffmpeg/build_via_docker.sh
new file mode 100755
index 0000000..d80dd66
--- /dev/null
+++ b/ffmpeg/build_via_docker.sh
@@ -0,0 +1,18 @@
+#!/bin/bash -e
+cd "$( dirname "${BASH_SOURCE[0]}" )"
+
+# Build Docker image
+docker build -t opencv_ffmpeg_mingw_build_ubuntu2014 docker
+
+echo "Downloading 3rdparty sources..."
+if [[ ! "${BUILD_SKIP_DOWNLOAD_SOURCES}" ]]; then
+  ./download_src.sh
+fi
+
+echo "Capture/exporting BUILD_* vars..."
+export | (grep -e '-x BUILD_' || true) > ../build/env.sh
+
+echo "Running docker container:"
+docker run --rm=true -it --name opencv_ffmpeg_mingw_build_ubuntu2014 \
+-e "APP_UID=$UID" -e APP_GID=$GROUPS \
+-v $(pwd):/app -v $(pwd)/../build:/build -v $(pwd)/../opencv:/build/opencv opencv_ffmpeg_mingw_build_ubuntu2014
diff --git a/ffmpeg/build_videoio_plugin.sh b/ffmpeg/build_videoio_plugin.sh
new file mode 100755
index 0000000..445bf11
--- /dev/null
+++ b/ffmpeg/build_videoio_plugin.sh
@@ -0,0 +1,132 @@
+#!/bin/bash -e
+# TODO: reduce binaries size
+# - gc-sections doesn't work properly with MinGW: https://sourceware.org/bugzilla/show_bug.cgi?id=11539
+
+{ # force bash to read file completelly
+
+. ../build/env.sh
+
+CURRENT_DIR=`pwd`
+BUILD_DIR=${1:-/build}
+CPU_COUNT=$(nproc || echo 4)
+
+DST_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+
+OPENCV_CMAKE_ARGS=(
+  -DCMAKE_BUILD_TYPE=Release
+  -DBUILD_SHARED_LIBS=OFF
+  -DCPU_DISPATCH=
+  "-DOPENCV_EXTRA_FLAGS=-DCV_EXPORTS= -D_GNU_SOURCE="
+  -DWITH_PTHREADS_PF=OFF
+  -DWITH_IPP=OFF -DWITH_ADE=OFF -DWITH_LAPACK=OFF -DWITH_OPENCL=OFF -DWITH_DIRECTX=OFF -DWITH_WIN32UI=OFF
+  -DWITH_EIGEN=OFF -DWITH_JPEG=OFF -DWITH_WEBP=OFF -DWITH_JASPER=OFF -DWITH_OPENJPEG=OFF -DWITH_OPENEXR=OFF -DWITH_PNG=OFF -DWITH_TIFF=OFF
+  -DWITH_FFMPEG=OFF -DWITH_GSTREAMER=OFF -DWITH_DSHOW=OFF -DWITH_1394=OFF
+  -DWITH_PROTOBUF=OFF -DWITH_IMGCODEC_HDR=OFF -DWITH_IMGCODEC_SUNRASTER=OFF -DWITH_IMGCODEC_PXM=OFF -DWITH_IMGCODEC_PFM=OFF
+  -DWITH_ITT=OFF -DCV_TRACE=OFF
+  -DBUILD_LIST=core,imgproc,videoio
+  -DOPENCV_CORE_EXCLUDE_C_API=1
+)
+
+OPENCV_PLUGIN_CMAKE_ARGS=(
+  "-DCMAKE_MODULE_LINKER_FLAGS=-static -lbcrypt -static-libgcc -static-libstdc++ -Wl,--gc-sections -Wl,-Bsymbolic"
+  -DCMAKE_BUILD_TYPE=Release
+  -DOPENCV_PLUGIN_MODULE_PREFIX=
+  -DOPENCV_FFMPEG_SKIP_DOWNLOAD=ON
+  -DCMAKE_INSTALL_PREFIX=$DST_DIR
+  ${BUILD_DIR}/opencv/modules/videoio/misc/plugin_ffmpeg
+  "-DOPENCV_PLUGIN_EXTRA_SRC_FILES=$DST_DIR/opencv_ffmpeg.rc"
+  "-DOPENCV_PLUGIN_VERSION="
+)
+
+build_opencv_64()
+{
+(
+  [[ -n "${CLEAN_BUILD_DIR}" ]] && {
+    rm -rf ${BUILD_DIR}/opencv_x86_64
+  }
+  mkdir -p ${BUILD_DIR}/opencv_x86_64
+  pushd ${BUILD_DIR}/opencv_x86_64
+  rm -rf CMake* || true
+  set -e
+  set -x
+  cmake -GNinja \
+      -DCMAKE_TOOLCHAIN_FILE=$CURRENT_DIR/mingw-toolchain-x86_64.cmake \
+      "${OPENCV_CMAKE_ARGS[@]}" \
+      /build/opencv
+  ninja opencv_modules -j${CPU_COUNT}
+  popd
+)
+}
+
+build_plugin_64()
+{
+(
+  rm -rf ${BUILD_DIR}/opencv_ffmpeg_plugin_x86_64
+  mkdir -p ${BUILD_DIR}/opencv_ffmpeg_plugin_x86_64
+  pushd ${BUILD_DIR}/opencv_ffmpeg_plugin_x86_64
+
+  set -e
+  set -x
+  PKG_CONFIG_PATH=${BUILD_DIR}/ffmpeg_x86_64/install/lib/pkgconfig \
+  RCFLAGS=-DFFMPEG_INTERNAL_NAME=opencv_videoio_ffmpeg_64 \
+  cmake -GNinja \
+      -DCMAKE_TOOLCHAIN_FILE=$CURRENT_DIR/mingw-toolchain-x86_64.cmake \
+      -DOpenCV_DIR=${BUILD_DIR}/opencv_x86_64 \
+      "${OPENCV_PLUGIN_CMAKE_ARGS[@]}"
+  ninja -v
+  ninja install/strip
+  strings ./opencv_videoio_ffmpeg_64.dll | grep '/src/' | grep opencv | uniq
+  popd
+)
+}
+
+build_opencv_32()
+{
+(
+  [[ -n "${CLEAN_BUILD_DIR}" ]] && {
+    rm -rf ${BUILD_DIR}/opencv_x86
+  }
+  mkdir -p ${BUILD_DIR}/opencv_x86
+  pushd ${BUILD_DIR}/opencv_x86
+  rm -rf CMake* || true
+  set -e
+  set -x
+  cmake -GNinja \
+      -DCMAKE_TOOLCHAIN_FILE=$CURRENT_DIR/mingw-toolchain-i686.cmake \
+      "${OPENCV_CMAKE_ARGS[@]}" \
+      /build/opencv
+  ninja opencv_modules -j${CPU_COUNT}
+  popd
+)
+}
+
+build_plugin_32()
+{
+(
+  rm -rf ${BUILD_DIR}/opencv_ffmpeg_plugin_x86
+  mkdir -p ${BUILD_DIR}/opencv_ffmpeg_plugin_x86
+  pushd ${BUILD_DIR}/opencv_ffmpeg_plugin_x86
+
+  set -e
+  set -x
+  PKG_CONFIG_PATH=${BUILD_DIR}/ffmpeg_x86/install/lib/pkgconfig \
+  RCFLAGS=-DFFMPEG_INTERNAL_NAME=opencv_videoio_ffmpeg \
+  cmake -GNinja \
+      -DCMAKE_TOOLCHAIN_FILE=$CURRENT_DIR/mingw-toolchain-i686.cmake \
+      -DOpenCV_DIR=${BUILD_DIR}/opencv_x86 \
+      "${OPENCV_PLUGIN_CMAKE_ARGS[@]}"
+  ninja -v
+  ninja install/strip
+  strings ./opencv_videoio_ffmpeg.dll | grep '/src/' | grep opencv | uniq
+  popd
+)
+}
+
+DEFAULT_TASKS=${1:-build_opencv_64 build_plugin_64 build_opencv_32 build_plugin_32}
+for t in $DEFAULT_TASKS $@; do
+  echo "Task: $t"
+  $t
+done
+
+exit 0
+}
diff --git a/ffmpeg/docker/Dockerfile b/ffmpeg/docker/Dockerfile
new file mode 100644
index 0000000..10ec985
--- /dev/null
+++ b/ffmpeg/docker/Dockerfile
@@ -0,0 +1,26 @@
+FROM ubuntu:20.04
+
+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 \
+    && \
+  rm -rf /var/lib/apt/lists/*
+
+RUN \
+  apt-get update && \
+  DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
+    cmake texinfo yasm bison subversion cvs m4 flex pax ninja-build \
+    && \
+  rm -rf /var/lib/apt/lists/*
+
+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 \
+    && \
+  rm -rf /var/lib/apt/lists/*
+
+CMD ["/app/docker/entry.sh"]
diff --git a/ffmpeg/docker/entry.sh b/ffmpeg/docker/entry.sh
new file mode 100755
index 0000000..e7c7b2f
--- /dev/null
+++ b/ffmpeg/docker/entry.sh
@@ -0,0 +1,6 @@
+#!/bin/bash
+
+groupadd -r appgroup -g $APP_GID
+useradd -u $APP_UID -r -g appgroup -d /home/appuser -m -s /bin/bash -c "App user" appuser
+
+exec su - appuser -c "cd /app && ./make_mingw.sh /build || /bin/bash"
diff --git a/ffmpeg/download_src.sh b/ffmpeg/download_src.sh
new file mode 100755
index 0000000..d740004
--- /dev/null
+++ b/ffmpeg/download_src.sh
@@ -0,0 +1,37 @@
+#!/bin/bash -ex
+#
+# This scripts creates build directory with:
+# - ffmpeg source tree (git://source.ffmpeg.org/ffmpeg.git)
+# - openh264 source tree (https://github.com/cisco/openh264.git)
+# - libvpx source tree (https://chromium.googlesource.com/webm/libvpx.git)
+
+update() {
+  DIR=$1
+  URL=$2
+  TAG=$3
+  [[ -d $DIR ]] || git clone $URL $DIR
+  (
+    cd $DIR
+    git fetch -t $URL $TAG
+    git checkout $TAG
+  ) || exit 1
+}
+
+mkdir -p ../build
+(
+cd ../build
+# https://github.com/FFmpeg/FFmpeg/tags
+update ffmpeg git://source.ffmpeg.org/ffmpeg.git n4.4.5
+# https://github.com/cisco/openh264/releases
+update openh264 https://github.com/cisco/openh264.git v1.8.0
+# https://chromium.googlesource.com/webm/libvpx.git
+update libvpx https://chromium.googlesource.com/webm/libvpx.git v1.15.0
+# https://aomedia.googlesource.com/aom
+update aom https://aomedia.googlesource.com/aom v3.11.0
+)
+
+# Pack all source code / build scripts
+./archive_src.sh
+
+echo "Downloading sources: DONE"
+exit 0
diff --git a/ffmpeg/dump_versions.sh b/ffmpeg/dump_versions.sh
new file mode 100755
index 0000000..7d3deed
--- /dev/null
+++ b/ffmpeg/dump_versions.sh
@@ -0,0 +1,4 @@
+#!/bin/bash
+DIR=./build/ffmpeg
+[ -d $DIR ] || DIR=../build/ffmpeg
+find $DIR -name '*version*.h' -exec grep -n -A3 'VERSION_MAJOR  ' {} \;
diff --git a/ffmpeg/ffmpeg_version.cmake b/ffmpeg/ffmpeg_version.cmake
new file mode 100644
index 0000000..77b6b0b
--- /dev/null
+++ b/ffmpeg/ffmpeg_version.cmake
@@ -0,0 +1,11 @@
+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_libavcodec_VERSION 58.134.100)
+set(FFMPEG_libavformat_VERSION 58.76.100)
+set(FFMPEG_libavutil_VERSION 56.70.100)
+set(FFMPEG_libswscale_VERSION 5.9.100)
+set(FFMPEG_libavresample_VERSION 4.0.0)
diff --git a/ffmpeg/make_mingw.sh b/ffmpeg/make_mingw.sh
new file mode 100755
index 0000000..279fb27
--- /dev/null
+++ b/ffmpeg/make_mingw.sh
@@ -0,0 +1,163 @@
+#!/bin/bash -ex
+# This file is well tested on Ubuntu
+# List of required packages for build see in docker/Dockerfile
+# (preferred way is to use Docker to produce similar environment)
+#
+# This script may not work in MINGW installation on Windows
+#
+# Usage ${0} <build_dir>
+# build directory should be created via download_src.sh script:
+#
+
+. ../build/env.sh
+
+CURRENT_DIR=`pwd`
+BUILD_DIR=${1:-.}
+CPU_COUNT=$(nproc || echo 4)
+
+## Libvpx
+
+libvpx_DIR=${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}
+mkdir -p ${libvpx_x86_DIR}
+rsync -a ./ ${libvpx_x86_DIR} --exclude .git
+cd ${libvpx_x86_DIR}
+CROSS=i686-w64-mingw32- ./configure --target=x86-win32-gcc ${libvpx_configure_OPTIONS} --prefix=${libvpx_x86_DIR}/install
+make -j ${CPU_COUNT}
+make install
+)
+#[ -d ${libvpx_x64_DIR} ] ||
+(
+cd ${libvpx_DIR}
+mkdir -p ${libvpx_x64_DIR}
+rsync -a ./ ${libvpx_x64_DIR} --exclude .git
+cd ${libvpx_x64_DIR}
+CROSS=x86_64-w64-mingw32- ./configure --target=x86_64-win64-gcc ${libvpx_configure_OPTIONS} --prefix=${libvpx_x64_DIR}/install
+make -j ${CPU_COUNT}
+make install
+)
+
+## Open264
+
+openh264_DIR=${BUILD_DIR}/openh264
+if [ ! -d ${openh264_DIR} ]; then
+  echo "OpenH264 source tree is not found"
+  exit 1
+fi
+openh264_x86_DIR=${openh264_DIR}/install_x86
+openh264_x86_64_DIR=${openh264_DIR}/install_x86_64
+(
+ cd ${openh264_DIR}
+ if [[ "${BUILD_SKIP_DOWNLOAD_SOURCES}" == "" ]]; then
+  make PREFIX=${openh264_x86_DIR} install-headers
+ else
+  PREFIX=${openh264_x86_DIR}
+  mkdir -p ${PREFIX}/include/wels
+  install -m 644 ${openh264_DIR}/codec/api/svc/codec*.h ${PREFIX}/include/wels
+ fi
+ mkdir -p ${openh264_x86_DIR}/lib/pkgconfig
+ i686-w64-mingw32-gcc -m32 -O2 -I${CURRENT_DIR}/openh264_wrapper -I${openh264_x86_DIR} \
+  -c ${CURRENT_DIR}/openh264_wrapper/wels/openh264_wrapper.c -o ${openh264_x86_DIR}/lib/openh264_wrapper.o
+ x86_64-w64-mingw32-ar rcs ${openh264_x86_DIR}/lib/libopenh264_wrapper.a ${openh264_x86_DIR}/lib/openh264_wrapper.o
+ cat >${openh264_x86_DIR}/lib/pkgconfig/openh264.pc << EOF
+prefix=${openh264_x86_DIR}
+includedir=\${prefix}/include
+
+Name: OpenH264
+Description: OpenH264 wrapper with dynamic loading
+Version: 1.8
+Libs: -L\${prefix}/lib -lopenh264_wrapper
+Libs.private:
+Cflags: -I${CURRENT_DIR}/openh264_wrapper -I\${prefix} -I\${includedir}
+EOF
+)
+(
+ cd ${openh264_DIR}
+ if [[ "${BUILD_SKIP_DOWNLOAD_SOURCES}" == "" ]]; then
+  make PREFIX=${openh264_x86_64_DIR} install-headers
+ else
+  PREFIX=${openh264_x86_64_DIR}
+  mkdir -p ${PREFIX}/include/wels
+  install -m 644 ${openh264_DIR}/codec/api/svc/codec*.h ${PREFIX}/include/wels
+ fi
+ mkdir -p ${openh264_x86_64_DIR}/lib/pkgconfig
+ x86_64-w64-mingw32-gcc -m64 -O2 -I${CURRENT_DIR}/openh264_wrapper -I${openh264_x86_64_DIR} \
+  -c ${CURRENT_DIR}/openh264_wrapper/wels/openh264_wrapper.c -o ${openh264_x86_64_DIR}/lib/openh264_wrapper.o
+ x86_64-w64-mingw32-ar rcs ${openh264_x86_64_DIR}/lib/libopenh264_wrapper.a ${openh264_x86_64_DIR}/lib/openh264_wrapper.o
+ cat >${openh264_x86_64_DIR}/lib/pkgconfig/openh264.pc << EOF
+prefix=${openh264_x86_64_DIR}
+includedir=\${prefix}/include
+
+Name: OpenH264
+Description: OpenH264 wrapper with dynamic loading
+Version: 1.8
+Libs: -L\${prefix}/lib -lopenh264_wrapper
+Libs.private:
+Cflags: -I${CURRENT_DIR}/openh264_wrapper -I\${prefix} -I\${includedir}
+EOF
+)
+
+## AOM: https://aomedia.googlesource.com/aom
+
+AOM_DIR=${BUILD_DIR}/aom
+if [ ! -d ${AOM_DIR} ]; then
+  echo "AOM source tree is not found"
+  exit 1
+fi
+AOM_X86_DIR=${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 "${AOM_X86_DIR}"
+  cmake -GNinja -DAOM_TARGET_CPU=generic -DCMAKE_TOOLCHAIN_FILE=${AOM_DIR}/build/cmake/toolchains/x86-mingw-gcc.cmake -DCMAKE_INSTALL_PREFIX=${AOM_X86_DIR}/install ${AOM_CONFIGURE_OPTIONS} ${AOM_DIR}
+  cmake --build . --target install
+)
+(
+  mkdir -p "${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} ${AOM_DIR}
+  cmake --build . --target install
+)
+
+FFMPEG_DIR=${BUILD_DIR}/ffmpeg
+if [ ! -d ${FFMPEG_DIR} ]; then
+  echo "FFMPEG source tree is not found"
+  exit 1
+fi
+
+## FFmpeg
+
+FFMPEG_x86_DIR=${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}
+ mkdir -p ${FFMPEG_x86_DIR}
+ rsync -a ./ ${FFMPEG_x86_DIR} --exclude .git
+ cd ${FFMPEG_x86_DIR}
+ PKG_CONFIG_PATH=${openh264_x86_DIR}/lib/pkgconfig:${libvpx_x86_DIR}/install/lib/pkgconfig:${AOM_X86_DIR}/install/lib/pkgconfig ./configure --enable-cross-compile --arch=x86 --target-os=mingw32 --cross-prefix=i686-w64-mingw32- ${FFMPEG_CONFIGURE_OPTIONS} --prefix=`pwd`/install
+ make -j${CPU_COUNT} install
+)
+#[ -d ${FFMPEG_x86_64_DIR} ] ||
+(
+ cd ${FFMPEG_DIR}
+ mkdir -p ${FFMPEG_x86_64_DIR}
+ rsync -a ./ ${FFMPEG_x86_64_DIR} --exclude .git
+ cd ${FFMPEG_x86_64_DIR}
+ PKG_CONFIG_PATH=${openh264_x86_64_DIR}/lib/pkgconfig:${libvpx_x64_DIR}/install/lib/pkgconfig:${AOM_X64_DIR}/install/lib/pkgconfig ./configure --enable-cross-compile --arch=x86_64 --target-os=mingw32 --cross-prefix=x86_64-w64-mingw32- ${FFMPEG_CONFIGURE_OPTIONS} --prefix=`pwd`/install
+ make -j${CPU_COUNT} install
+)
+
+## OpenCV plugins
+./build_videoio_plugin.sh
diff --git a/ffmpeg/mingw-toolchain-i686.cmake b/ffmpeg/mingw-toolchain-i686.cmake
new file mode 100644
index 0000000..4f3cefe
--- /dev/null
+++ b/ffmpeg/mingw-toolchain-i686.cmake
@@ -0,0 +1,13 @@
+set(CMAKE_SYSTEM_NAME Windows)
+set(CMAKE_SYSTEM_PROCESSOR x86)
+set(TOOLCHAIN_PREFIX i686-w64-mingw32)
+
+set(CMAKE_C_COMPILER ${TOOLCHAIN_PREFIX}-gcc)
+set(CMAKE_CXX_COMPILER ${TOOLCHAIN_PREFIX}-g++-posix)
+set(CMAKE_RC_COMPILER ${TOOLCHAIN_PREFIX}-windres)
+
+set(CMAKE_FIND_ROOT_PATH /usr/${TOOLCHAIN_PREFIX} /build/)
+
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
diff --git a/ffmpeg/mingw-toolchain-x86_64.cmake b/ffmpeg/mingw-toolchain-x86_64.cmake
new file mode 100644
index 0000000..2577a34
--- /dev/null
+++ b/ffmpeg/mingw-toolchain-x86_64.cmake
@@ -0,0 +1,13 @@
+set(CMAKE_SYSTEM_NAME Windows)
+set(CMAKE_SYSTEM_PROCESSOR x86_64)
+set(TOOLCHAIN_PREFIX x86_64-w64-mingw32)
+
+set(CMAKE_C_COMPILER ${TOOLCHAIN_PREFIX}-gcc)
+set(CMAKE_CXX_COMPILER ${TOOLCHAIN_PREFIX}-g++-posix)
+set(CMAKE_RC_COMPILER ${TOOLCHAIN_PREFIX}-windres)
+
+set(CMAKE_FIND_ROOT_PATH /usr/${TOOLCHAIN_PREFIX} /build/)
+
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
diff --git a/ffmpeg/opencv_ffmpeg.rc b/ffmpeg/opencv_ffmpeg.rc
new file mode 100644
index 0000000..8f634d0
--- /dev/null
+++ b/ffmpeg/opencv_ffmpeg.rc
@@ -0,0 +1,46 @@
+#include <winver.h>
+
+#ifndef FFMPEG_INTERNAL_NAME
+#error Configuration error, missing FFMPEG_INTERNAL_NAME
+#endif
+
+#define STR_(__A) #__A
+#define STR(__A)  STR_(__A)
+
+
+VS_VERSION_INFO         VERSIONINFO
+  FILEVERSION           2024,12,0,0
+  PRODUCTVERSION        2024,12,0,0
+  FILEFLAGSMASK         VS_FFI_FILEFLAGSMASK
+#ifdef _DEBUG
+  FILEFLAGS             1
+#else
+  FILEFLAGS             0
+#endif
+  FILEOS                VOS__WINDOWS32
+  FILETYPE              VFT_DLL
+  FILESUBTYPE           0
+BEGIN
+  BLOCK "StringFileInfo"
+  BEGIN
+    BLOCK "040904E4"
+    BEGIN
+      VALUE "FileDescription",	"OpenCV FFmpeg wrapper\0"
+      VALUE "FileVersion",	"2024.12.0\0"
+      VALUE "InternalName",	STR(FFMPEG_INTERNAL_NAME) "\0"
+#if 0
+      VALUE "LegalCopyright",	"\0"
+#endif
+      VALUE "OriginalFilename",	STR(FFMPEG_INTERNAL_NAME) ".dll\0"
+      VALUE "ProductName",	"OpenCV FFmpeg wrapper\0"
+      VALUE "ProductVersion",	"2024.12.0\0"
+#if 1
+      VALUE "Comments",		"http://opencv.org/\0"
+#endif
+    END
+  END
+  BLOCK "VarFileInfo"
+  BEGIN
+    VALUE "Translation", 0x0409, 1252
+  END
+END
diff --git a/ffmpeg/opencv_videoio_ffmpeg.dll b/ffmpeg/opencv_videoio_ffmpeg.dll
new file mode 100755
index 0000000..214d9f8
Binary files /dev/null and b/ffmpeg/opencv_videoio_ffmpeg.dll differ
diff --git a/ffmpeg/opencv_videoio_ffmpeg_64.dll b/ffmpeg/opencv_videoio_ffmpeg_64.dll
new file mode 100755
index 0000000..43d44b1
Binary files /dev/null and b/ffmpeg/opencv_videoio_ffmpeg_64.dll differ
diff --git a/ffmpeg/openh264_wrapper/wels/codec_api.h b/ffmpeg/openh264_wrapper/wels/codec_api.h
new file mode 100644
index 0000000..227ab75
--- /dev/null
+++ b/ffmpeg/openh264_wrapper/wels/codec_api.h
@@ -0,0 +1,211 @@
+//
+// This file is a wrapper with dynamic loader for OpenH264 binaries
+// Tested with ffmpeg source tree with enabled OpenH264 support
+//
+// Based on the header file from OpenH264 project:
+//     https://github.com/cisco/openh264/blob/master/codec/api/svc/codec_api.h
+//
+
+#ifndef __WELS_VIDEO_CODEC_SVC_API_WRAPPER_H__
+#define __WELS_VIDEO_CODEC_SVC_API_WRAPPER_H__
+
+#define WelsCreateSVCEncoder WelsCreateSVCEncoder_
+#define WelsDestroySVCEncoder WelsDestroySVCEncoder_
+#define WelsGetDecoderCapability WelsGetDecoderCapability_
+#define WelsCreateDecoder WelsCreateDecoder_
+#define WelsDestroyDecoder WelsDestroyDecoder_
+#define WelsGetCodecVersion WelsGetCodecVersion_
+#define WelsGetCodecVersionEx WelsGetCodecVersionEx_
+
+// include original file
+#include "include/wels/codec_api.h"
+
+#undef WelsCreateSVCEncoder
+#undef WelsDestroySVCEncoder
+#undef WelsGetDecoderCapability
+#undef WelsCreateDecoder
+#undef WelsDestroyDecoder
+#undef WelsGetCodecVersion
+#undef WelsGetCodecVersionEx
+
+// Declarations
+int WelsCreateSVCEncoder(ISVCEncoder** ppEncoder);
+void WelsDestroySVCEncoder(ISVCEncoder* pEncoder);
+int WelsGetDecoderCapability(SDecoderCapability* pDecCapability);
+long WelsCreateDecoder(ISVCDecoder** ppDecoder);
+void WelsDestroyDecoder(ISVCDecoder* pDecoder);
+OpenH264Version WelsGetCodecVersion(void);
+void WelsGetCodecVersionEx(OpenH264Version *pVersion);
+
+
+#ifdef OPENH264WRAPPER_WITH_IMPLEMENTATION
+
+// Fallback
+// TODO Calling convention?
+static int WelsCreateSVCEncoder_fallback (ISVCEncoder** ppEncoder) { return 1; /*error*/ }
+static void WelsDestroySVCEncoder_fallback (ISVCEncoder* pEncoder) { }
+static int WelsGetDecoderCapability_fallback (SDecoderCapability* pDecCapability) { return 1; /*error*/ }
+static long WelsCreateDecoder_fallback (ISVCDecoder** ppDecoder) { return 1; /*error*/ }
+static void WelsDestroyDecoder_fallback (ISVCDecoder* pDecoder) { }
+static OpenH264Version WelsGetCodecVersion_fallback (void)
+{
+    static const OpenH264Version v  = {0, 0, 0, 0};
+    return v;
+}
+static void WelsGetCodecVersionEx_fallback (OpenH264Version *pVersion)
+{
+    static const OpenH264Version v  = {0, 0, 0, 0};
+    *pVersion = v;
+}
+
+typedef int (*FN_WelsCreateSVCEncoder) (ISVCEncoder** ppEncoder);
+typedef void (*FN_WelsDestroySVCEncoder) (ISVCEncoder* pEncoder);
+typedef int (*FN_WelsGetDecoderCapability) (SDecoderCapability* pDecCapability);
+typedef long (*FN_WelsCreateDecoder) (ISVCDecoder** ppDecoder);
+typedef void (*FN_WelsDestroyDecoder) (ISVCDecoder* pDecoder);
+typedef OpenH264Version (*FN_WelsGetCodecVersion) (void);
+typedef void (*FN_WelsGetCodecVersionEx) (OpenH264Version *pVersion);
+
+static FN_WelsCreateSVCEncoder p_WelsCreateSVCEncoder = WelsCreateSVCEncoder_fallback;
+static FN_WelsDestroySVCEncoder p_WelsDestroySVCEncoder = WelsDestroySVCEncoder_fallback;
+static FN_WelsGetDecoderCapability p_WelsGetDecoderCapability = WelsGetDecoderCapability_fallback;
+static FN_WelsCreateDecoder p_WelsCreateDecoder = WelsCreateDecoder_fallback;
+static FN_WelsDestroyDecoder p_WelsDestroyDecoder = WelsDestroyDecoder_fallback;
+static FN_WelsGetCodecVersion p_WelsGetCodecVersion = WelsGetCodecVersion_fallback;
+static FN_WelsGetCodecVersionEx p_WelsGetCodecVersionEx = WelsGetCodecVersionEx_fallback;
+
+#include <stdio.h>
+#ifdef _WIN32
+#include <windows.h>
+#elif defined __linux__ || defined __APPLE__
+#include <dlfcn.h>
+#endif
+
+#ifdef _WIN32
+#define LIBRARY_HANDLE_TYPE HANDLE
+#else
+#define LIBRARY_HANDLE_TYPE void*
+#endif
+static int _loadLibrary(const char* name, LIBRARY_HANDLE_TYPE* handle)
+{
+#ifdef _WIN32
+    *handle = LoadLibraryA(name);
+#define GETADDR(name) GetProcAddress(handle, #name)
+#elif defined __linux__ || defined __APPLE__
+    *handle = dlopen(name, RTLD_LAZY | RTLD_GLOBAL);
+#define GETADDR(name) dlsym(handle, #name)
+#else
+#error "Not supported platform"
+#endif
+    return (handle != NULL) ? 1 : 0;
+}
+
+
+static void _initLibrary(void)
+{
+    static const char* defaultLibraryName =
+#ifdef _WIN32
+#if defined _M_X64 || defined __x86_64__
+        "openh264-1.8.0-win64.dll"
+#else
+        "openh264-1.8.0-win32.dll"
+#endif
+// Linux/Unix based on dlopen/dlsym
+#elif defined __linux__
+# if defined __x86_64__
+        "libopenh264-1.8.0-linux64.4.so"
+# else
+        "libopenh264-1.8.0-linux32.4.so"
+# endif
+#elif defined __APPLE__
+# if defined __x86_64__
+        "libopenh264-1.8.0-osx64.4.dylib"
+# else
+        "libopenh264-1.8.0-osx32.4.dylib"
+# endif
+#else
+#error "Not supported platform"
+#endif
+    ;
+
+    int errors = 0;
+    void *fn_addr = NULL;
+
+    const char* forced_name = getenv("OPENH264_LIBRARY");
+    const char* libraryName = forced_name == NULL ? defaultLibraryName : forced_name;
+
+    LIBRARY_HANDLE_TYPE handle = NULL;
+    if (_loadLibrary(libraryName, &handle) == 0)
+    {
+        errors++;
+    }
+    else if (handle == NULL)
+    {
+        errors++;
+    }
+    else
+    {
+#define FILLADDR(name) \
+        fn_addr = GETADDR(name); \
+        if (fn_addr != NULL) \
+            p_ ## name = (FN_ ## name)fn_addr; \
+        else \
+            errors++;
+        FILLADDR(WelsCreateSVCEncoder)
+        FILLADDR(WelsDestroySVCEncoder)
+#ifdef _WIN32
+        // Not exported into DLL: FILLADDR(WelsGetDecoderCapability)
+#else
+        FILLADDR(WelsGetDecoderCapability)
+#endif
+        FILLADDR(WelsCreateDecoder)
+        FILLADDR(WelsDestroyDecoder)
+        FILLADDR(WelsGetCodecVersion)
+        FILLADDR(WelsGetCodecVersionEx)
+    }
+#undef FILLADDR
+#undef GETADDR
+#undef LIBRARY_HANDLE_TYPE
+    if (errors == 0)
+    {
+        fprintf(stderr, "\n\tOpenH264 Video Codec provided by Cisco Systems, Inc.\n\n");
+    }
+    else
+    {
+        fprintf(stderr, "\nFailed to load OpenH264 library: %s\n", libraryName);
+        fprintf(stderr, "\tPlease check environment and/or download library: https://github.com/cisco/openh264/releases\n\n");
+    }
+}
+
+static void initLibrary(void)
+{
+    static bool initialized = false;
+    if (initialized)
+        return;
+    _initLibrary();
+    initialized = true;
+}
+
+#define WRAP(name, ret_type, decl_args, call_args) \
+ret_type name decl_args { \
+    initLibrary(); \
+    return p_ ## name call_args; \
+}
+
+#define WRAP_VOID(name, decl_args, call_args) \
+void name decl_args { \
+    initLibrary(); \
+    p_ ## name call_args; \
+}
+
+WRAP(WelsCreateSVCEncoder, int, (ISVCEncoder** ppEncoder), (ppEncoder) )
+WRAP_VOID(WelsDestroySVCEncoder, (ISVCEncoder* pEncoder), (pEncoder) )
+WRAP(WelsGetDecoderCapability, int, (SDecoderCapability* pDecCapability), (pDecCapability) )
+WRAP(WelsCreateDecoder, long, (ISVCDecoder** ppDecoder), (ppDecoder) )
+WRAP_VOID(WelsDestroyDecoder, (ISVCDecoder* pDecoder), (pDecoder) )
+WRAP(WelsGetCodecVersion, OpenH264Version, (void), () )
+WRAP_VOID(WelsGetCodecVersionEx, (OpenH264Version *pVersion), (pVersion) )
+
+#endif
+
+#endif // __WELS_VIDEO_CODEC_SVC_API_WRAPPER_H__
diff --git a/ffmpeg/openh264_wrapper/wels/openh264_wrapper.c b/ffmpeg/openh264_wrapper/wels/openh264_wrapper.c
new file mode 100644
index 0000000..75d2ace
--- /dev/null
+++ b/ffmpeg/openh264_wrapper/wels/openh264_wrapper.c
@@ -0,0 +1,19 @@
+//
+// This file is a wrapper with dynamic loader for OpenH264 binaries
+// Tested with ffmpeg source tree with enabled OpenH264 support
+//
+// Based on the header file from OpenH264 project:
+//     https://github.com/cisco/openh264/blob/master/codec/api/svc/codec_api.h
+//
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define OPENH264WRAPPER_WITH_IMPLEMENTATION
+
+#include "codec_api.h"
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/license.txt b/license.txt
new file mode 100644
index 0000000..e018837
--- /dev/null
+++ b/license.txt
@@ -0,0 +1,520 @@
+              Copyright (C) 2001 Fabrice Bellard
+
+    FFmpeg is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 of the License, or (at your option) any later version.
+
+    FFmpeg is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with FFmpeg; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+
+==================================================================================
+
+                  GNU LESSER GENERAL PUBLIC LICENSE
+                       Version 2.1, February 1999
+
+ Copyright (C) 1991, 1999 Free Software Foundation, Inc.
+ 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+[This is the first released version of the Lesser GPL.  It also counts
+ as the successor of the GNU Library Public License, version 2, hence
+ the version number 2.1.]
+
+                            Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+Licenses are intended to guarantee your freedom to share and change
+free software--to make sure the software is free for all its users.
+
+  This license, the Lesser General Public License, applies to some
+specially designated software packages--typically libraries--of the
+Free Software Foundation and other authors who decide to use it.  You
+can use it too, but we suggest you first think carefully about whether
+this license or the ordinary General Public License is the better
+strategy to use in any particular case, based on the explanations below.
+
+  When we speak of free software, we are referring to freedom of use,
+not price.  Our General Public Licenses are designed to make sure that
+you have the freedom to distribute copies of free software (and charge
+for this service if you wish); that you receive source code or can get
+it if you want it; that you can change the software and use pieces of
+it in new free programs; and that you are informed that you can do
+these things.
+
+  To protect your rights, we need to make restrictions that forbid
+distributors to deny you these rights or to ask you to surrender these
+rights.  These restrictions translate to certain responsibilities for
+you if you distribute copies of the library or if you modify it.
+
+  For example, if you distribute copies of the library, whether gratis
+or for a fee, you must give the recipients all the rights that we gave
+you.  You must make sure that they, too, receive or can get the source
+code.  If you link other code with the library, you must provide
+complete object files to the recipients, so that they can relink them
+with the library after making changes to the library and recompiling
+it.  And you must show them these terms so they know their rights.
+
+  We protect your rights with a two-step method: (1) we copyright the
+library, and (2) we offer you this license, which gives you legal
+permission to copy, distribute and/or modify the library.
+
+  To protect each distributor, we want to make it very clear that
+there is no warranty for the free library.  Also, if the library is
+modified by someone else and passed on, the recipients should know
+that what they have is not the original version, so that the original
+author's reputation will not be affected by problems that might be
+introduced by others.
+
+  Finally, software patents pose a constant threat to the existence of
+any free program.  We wish to make sure that a company cannot
+effectively restrict the users of a free program by obtaining a
+restrictive license from a patent holder.  Therefore, we insist that
+any patent license obtained for a version of the library must be
+consistent with the full freedom of use specified in this license.
+
+  Most GNU software, including some libraries, is covered by the
+ordinary GNU General Public License.  This license, the GNU Lesser
+General Public License, applies to certain designated libraries, and
+is quite different from the ordinary General Public License.  We use
+this license for certain libraries in order to permit linking those
+libraries into non-free programs.
+
+  When a program is linked with a library, whether statically or using
+a shared library, the combination of the two is legally speaking a
+combined work, a derivative of the original library.  The ordinary
+General Public License therefore permits such linking only if the
+entire combination fits its criteria of freedom.  The Lesser General
+Public License permits more lax criteria for linking other code with
+the library.
+
+  We call this license the "Lesser" General Public License because it
+does Less to protect the user's freedom than the ordinary General
+Public License.  It also provides other free software developers Less
+of an advantage over competing non-free programs.  These disadvantages
+are the reason we use the ordinary General Public License for many
+libraries.  However, the Lesser license provides advantages in certain
+special circumstances.
+
+  For example, on rare occasions, there may be a special need to
+encourage the widest possible use of a certain library, so that it becomes
+a de-facto standard.  To achieve this, non-free programs must be
+allowed to use the library.  A more frequent case is that a free
+library does the same job as widely used non-free libraries.  In this
+case, there is little to gain by limiting the free library to free
+software only, so we use the Lesser General Public License.
+
+  In other cases, permission to use a particular library in non-free
+programs enables a greater number of people to use a large body of
+free software.  For example, permission to use the GNU C Library in
+non-free programs enables many more people to use the whole GNU
+operating system, as well as its variant, the GNU/Linux operating
+system.
+
+  Although the Lesser General Public License is Less protective of the
+users' freedom, it does ensure that the user of a program that is
+linked with the Library has the freedom and the wherewithal to run
+that program using a modified version of the Library.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.  Pay close attention to the difference between a
+"work based on the library" and a "work that uses the library".  The
+former contains code derived from the library, whereas the latter must
+be combined with the library in order to run.
+
+                  GNU LESSER GENERAL PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. This License Agreement applies to any software library or other
+program which contains a notice placed by the copyright holder or
+other authorized party saying it may be distributed under the terms of
+this Lesser General Public License (also called "this License").
+Each licensee is addressed as "you".
+
+  A "library" means a collection of software functions and/or data
+prepared so as to be conveniently linked with application programs
+(which use some of those functions and data) to form executables.
+
+  The "Library", below, refers to any such software library or work
+which has been distributed under these terms.  A "work based on the
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+straightforwardly into another language.  (Hereinafter, translation is
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+  "Source code" for a work means the preferred form of the work for
+making modifications to it.  For a library, complete source code means
+all the source code for all modules it contains, plus any associated
+interface definition files, plus the scripts used to control compilation
+and installation of the library.
+
+  Activities other than copying, distribution and modification are not
+covered by this License; they are outside its scope.  The act of
+running a program using the Library is not restricted, and output from
+such a program is covered only if its contents constitute a work based
+on the Library (independent of the use of the Library in a tool for
+writing it).  Whether that is true depends on what the Library does
+and what the program that uses the Library does.
+
+  1. You may copy and distribute verbatim copies of the Library's
+complete source code as you receive it, in any medium, provided that
+you conspicuously and appropriately publish on each copy an
+appropriate copyright notice and disclaimer of warranty; keep intact
+all the notices that refer to this License and to the absence of any
+warranty; and distribute a copy of this License along with the
+Library.
+
+  You may charge a fee for the physical act of transferring a copy,
+and you may at your option offer warranty protection in exchange for a
+fee.
+
+  2. You may modify your copy or copies of the Library or any portion
+of it, thus forming a work based on the Library, and copy and
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+above, provided that you also meet all of these conditions:
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+    a) The modified work must itself be a software library.
+
+    b) You must cause the files modified to carry prominent notices
+    stating that you changed the files and the date of any change.
+
+    c) You must cause the whole of the work to be licensed at no
+    charge to all third parties under the terms of this License.
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+
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+    a purpose that is entirely well-defined independent of the
+    application.  Therefore, Subsection 2d requires that any
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+    be optional: if the application does not supply it, the square
+    root function must still compute square roots.)
+
+These requirements apply to the modified work as a whole.  If
+identifiable sections of that work are not derived from the Library,
+and can be reasonably considered independent and separate works in
+themselves, then this License, and its terms, do not apply to those
+sections when you distribute them as separate works.  But when you
+distribute the same sections as part of a whole which is a work based
+on the Library, the distribution of the whole must be on the terms of
+this License, whose permissions for other licensees extend to the
+entire whole, and thus to each and every part regardless of who wrote
+it.
+
+Thus, it is not the intent of this section to claim rights or contest
+your rights to work written entirely by you; rather, the intent is to
+exercise the right to control the distribution of derivative or
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diff --git a/opencv b/opencv
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--- /dev/null
+++ b/opencv
@@ -0,0 +1 @@
+Subproject commit 09892c9d1706f40342bda0bc404580f63492d9f8
diff --git a/readme.txt b/readme.txt
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--- /dev/null
+++ b/readme.txt
@@ -0,0 +1,37 @@
+* On Linux and other Unix flavors OpenCV uses default or user-built ffmpeg/libav libraries.
+  If user builds ffmpeg/libav from source and wants OpenCV to stay BSD library, not GPL/LGPL,
+  he/she should use --enabled-shared configure flag and make sure that no GPL components are
+  enabled (some notable examples are x264 (H264 encoder) and libac3 (Dolby AC3 audio codec)).
+  See https://www.ffmpeg.org/legal.html for details.
+
+  If you want to play very safe and do not want to use FFMPEG at all, regardless of whether it's installed on
+  your system or not, configure and build OpenCV using CMake with WITH_FFMPEG=OFF flag. OpenCV will then use
+  AVFoundation (OSX), GStreamer (Linux) or other available backends supported by opencv_videoio module.
+
+  There is also our self-contained motion jpeg codec, which you can use without any worries.
+  It handles CV_FOURCC('M', 'J', 'P', 'G') streams within an AVI container (".avi").
+
+* On Windows OpenCV uses pre-built ffmpeg binaries, built with proper flags (without GPL components) and
+  wrapped with simple, stable OpenCV-compatible API.
+  The binaries are opencv_videoio_ffmpeg.dll (version for 32-bit Windows) and
+  opencv_videoio_ffmpeg_64.dll (version for 64-bit Windows).
+
+  The pre-built opencv_videoio_ffmpeg*.dll is:
+  * LGPL library, not BSD libraries.
+  * Loaded at runtime by opencv_videoio module.
+    If it succeeds, ffmpeg can be used to decode/encode videos;
+    otherwise, other API is used.
+
+  FFMPEG build includes support for H264 encoder based on the OpenH264 library.
+  OpenH264 Video Codec provided by Cisco Systems, Inc.
+  See https://github.com/cisco/openh264/releases for details and OpenH264 license.
+  OpenH264 library should be installed separatelly. Downloaded binary file can be placed into global system path
+  (System32 or SysWOW64) or near application binaries (check documentation of "LoadLibrary" Win32 function from MSDN).
+  Or you can specify location of binary file via OPENH264_LIBRARY environment variable.
+
+  If LGPL/GPL software can not be supplied with your OpenCV-based product, simply exclude
+  opencv_videoio_ffmpeg*.dll from your distribution; OpenCV will stay fully functional except for the ability to
+  decode/encode videos using FFMPEG (though, it may still be able to do that using other API,
+  such as Video for Windows, Windows Media Foundation or our self-contained motion jpeg codec).
+
+  See license.txt for the FFMPEG copyright notice and the licensing terms.
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