Initial commit

README.md

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+This project hosts a script to generate a minimal FFmpeg Windows build for
+[scrcpy].
+
+[scrcpy]: https://github.com/Genymobile/scrcpy
+
+The script is intended to be executred on Linux (typically Debian), with
+`mingw-w64` installed.
+
+The packages `libz-mingw-w64` and `libz-mingw-w64-dev` (necessary for zlib) must
+be installed.
+
+First, clone the official FFmpeg project anywhere:
+
+```
+git clone git://source.ffmpeg.org/ffmpeg.git
+```
+
+Checkout the expected version.
+
+Then, from this `scrcpy-deps` repo, run:
+
+```
+./build_ffmpeg_windows.sh <ffmpeg_directory>
+```

build_ffmpeg_windows.sh

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+#!/bin/bash
+set -e
+
+if [[ $# -lt 1 ]]
+then
+    echo "Syntax: $0 <ffmpeg_directory>" >&2
+    exit 1
+fi
+
+FFMPEG_DIRECTORY="$1"
+
+configure_ffmpeg() {
+    # -static-libgcc to avoid missing libgcc_s_dw2-1.dll
+    CFLAGS=-static-libgcc \
+    LDFLAGS=-static-libgcc \
+    "$FFMPEG_DIRECTORY"/configure \
+        --prefix=install \
+        --enable-cross-compile \
+        --target-os=mingw32 \
+        --arch="$ARCH" \
+        --cross-prefix="$CROSS_PREFIX" \
+        --cc="${CROSS_PREFIX}gcc" \
+        --extra-cflags="-O2 -fPIC" \
+        --enable-shared \
+        --disable-static \
+        --disable-programs \
+        --disable-doc \
+        --disable-swscale \
+        --disable-postproc \
+        --disable-avfilter \
+        --disable-avdevice \
+        --disable-network \
+        --disable-everything \
+        --enable-swresample \
+        --enable-decoder=h264 \
+        --enable-decoder=hevc \
+        --enable-decoder=av1 \
+        --enable-decoder=opus \
+        --enable-decoder=aac \
+        --enable-decoder=png \
+        --enable-protocol=file \
+        --enable-demuxer=image2 \
+        --enable-parser=png \
+        --enable-zlib \
+        --enable-muxer=matroska \
+        --enable-muxer=mp4 \
+        --disable-vulkan
+}
+
+configure_ffmpeg_win64() {
+    ARCH=x86_64
+    CROSS_PREFIX="x86_64-w64-mingw32-"
+    configure_ffmpeg
+}
+
+configure_ffmpeg_win32() {
+    ARCH=x86
+    CROSS_PREFIX="i686-w64-mingw32-"
+    configure_ffmpeg
+}
+
+build_install() {
+    local ABI="$1"
+    rm -rf build-"$ABI"
+    mkdir build-"$ABI"
+    cd build-"$ABI"
+    configure_ffmpeg_"$ABI"
+    make -j
+    make install
+    cd ..
+}
+
+copy_release_binaries() {
+    local ABI="$1"
+    mkdir -p "ffmpeg/$ABI/bin"
+    for name in avutil-57 avcodec-59 avformat-59 swresample-4
+    do
+        cp "../build-$ABI/install/bin/$name.dll" "ffmpeg/$ABI/bin/"
+    done
+    cp -r "../build-$ABI/install/include" "ffmpeg/$ABI/"
+}
+
+mkdir -p ffmpeg
+cd ffmpeg
+
+build_install win64
+build_install win32
+
+mkdir -p release/ffmpeg
+cd release
+
+copy_release_binaries win64
+copy_release_binaries win32
+
+# libz-mingw-w64 and libz-mingw-w64-dev must be installed
+cp /usr/x86_64-w64-mingw32/lib/zlib1.dll ffmpeg/win64/bin/
+cp /usr/i686-w64-mingw32/lib/zlib1.dll ffmpeg/win32/bin/
+
+7z a ffmpeg-release.7z ffmpeg
+echo "FFmpeg release written to $PWD/ffmpeg-release.7z"