ffmpeg Alpine for OpenWRT compilation

build-arm64-cortex-a53.sh

#!/bin/bash

docker build \
    -t ffmpeg-alpine-muslc-arm64-cortex-a53 \
    --platform linux/arm64 \
    --build-arg CFLAGS="-O3 -mcpu=cortex-a53+crc+crypto+simd -D_POSIX_C_SOURCE=200809L -D_DEFAULT_SOURCE" \
    --build-arg FFMPEG_EXTRA_ARGS="--cpu=cortex-a53" \
    ${@} \
    .

Dockerfile

# ===============================
# Alpine-based Dockerfile for FFmpeg compilation
# Use Alpine Linux as the base image which uses musl libc
# Should be able to run in OpenWrt (tested in OpenWrt 24.10.2)
# Static build with libx264 + libx265 + libdav1d + libogg + libvorbis + libopus + libmp3lame + libvpx + libtheora + libaom + libfdk-aac + libass + libfreetype + fontconfig + libwebp
# ===============================

# ===============================
# Stage 1: Builder
# ===============================
FROM alpine:3.22 AS builder

# ------------------------------
# Install build dependencies
# ------------------------------
RUN apk update && apk add --no-cache \
    bash \
    busybox \
    cmake \
    file \
    g++ \
    gcc \
    git \
    gnutls \
    gnutls-dev \
    libc-dev \
    make \
    musl-dev \
    nasm \
    perl \
    yasm \
    wget \
    curl \
    meson \
    ninja \
    autoconf \
    automake \
    libtool \
    gperf \
    diffutils \
    upx

# ------------------------------
# Environment variables
# ------------------------------
ENV PREFIX="/usr/local"
ENV PATH="$PREFIX/bin:$PATH"
ENV PKG_CONFIG_PATH="$PREFIX/lib/pkgconfig"

# Set default compiler flags and FFmpeg CPU target
ARG CFLAGS="-O3 -D_POSIX_C_SOURCE=200809L -D_DEFAULT_SOURCE -fPIC"
ARG CXXFLAGS="$CFLAGS"
ARG FFMPEG_EXTRA_ARGS=""
# ENV LDFLAGS="-static"

WORKDIR /tmp

# ------------------------------
# Build zlib (static)
# ------------------------------
RUN wget https://zlib.net/zlib-1.3.1.tar.gz \
    && tar xzf zlib-1.3.1.tar.gz \
    && cd zlib-1.3.1 \
    && ./configure \
        --prefix=$PREFIX \
        --static \
    && make -j$(nproc) \
    && make install

# ------------------------------
# Build x264 (static)
# ------------------------------
RUN git clone https://code.videolan.org/videolan/x264.git \
    && cd x264 \
    && git checkout 0480cb05fa188d37ae87e8f4fd8f1aea3711f7ee \
    && ./configure \
        --prefix=$PREFIX \
        --enable-static \
        --disable-shared \
        --enable-pic \
        --disable-cli \
    && make -j$(nproc) \
    && make install

# ------------------------------
# Build x265 (static, 8-bit + 10-bit + 12-bit, disable tests)
# ------------------------------
RUN git clone https://bitbucket.org/multicoreware/x265_git.git \
    && cd x265_git/source \
    && git checkout 4.1 \
    && mkdir -p build/linux

# Build 12-bit
RUN cd x265_git/source/build/linux \
    && mkdir -p 12bit && cd 12bit \
    && cmake ../../.. \
        -DCMAKE_INSTALL_PREFIX=$PREFIX \
        -DCMAKE_BUILD_TYPE=Release \
        -DENABLE_SHARED=OFF \
        -DBUILD_SHARED_LIBS=OFF \
        -DHIGH_BIT_DEPTH=ON \
        -DENABLE_HDR10_PLUS=ON \
        -DEXPORT_C_API=OFF \
        -DENABLE_CLI=OFF \
        -DMAIN12=ON \
    && make -j$(nproc)

# Build 10-bit
RUN cd x265_git/source/build/linux \
    && mkdir -p 10bit && cd 10bit \
    && cmake ../../.. \
        -DCMAKE_INSTALL_PREFIX=$PREFIX \
        -DCMAKE_BUILD_TYPE=Release \
        -DENABLE_SHARED=OFF \
        -DBUILD_SHARED_LIBS=OFF \
        -DHIGH_BIT_DEPTH=ON \
        -DENABLE_HDR10_PLUS=ON \
        -DEXPORT_C_API=OFF \
        -DENABLE_CLI=OFF \
    && make -j$(nproc)

# Build 8-bit and combine all
RUN cd x265_git/source/build/linux \
    && mkdir -p 8bit && cd 8bit \
    && ln -sf ../10bit/libx265.a libx265_main10.a \
    && ln -sf ../12bit/libx265.a libx265_main12.a \
    && cmake ../../.. \
        -DCMAKE_INSTALL_PREFIX=$PREFIX \
        -DCMAKE_BUILD_TYPE=Release \
        -DENABLE_SHARED=OFF \
        -DBUILD_SHARED_LIBS=OFF \
        -DEXTRA_LIB="x265_main10.a;x265_main12.a;-ldl" \
        -DEXTRA_LINK_FLAGS=-L. \
        -DLINKED_10BIT=ON \
        -DLINKED_12BIT=ON \
    && make -j$(nproc) \
    && mv libx265.a libx265_main.a \
    && printf 'CREATE libx265.a\nADDLIB libx265_main.a\nADDLIB libx265_main10.a\nADDLIB libx265_main12.a\nSAVE\nEND\n' | ar -M \
    && make install


RUN git clone https://gitlab.com/AOMediaCodec/SVT-AV1.git \
    && cd SVT-AV1 \
    && git checkout v3.1.2 \
    && mkdir -p build && cd build \
    && cmake .. \
      -DCMAKE_BUILD_TYPE=Release \
      -DBUILD_SHARED_LIBS=OFF \
      -DENABLE_UNIT_TESTS=OFF \
      -DENABLE_APPS=OFF \
      -DCMAKE_INSTALL_PREFIX=/usr/local \
    && make -j$(nproc) \
    && make install

# --------------------------
# Build dav1d (static)
# --------------------------
RUN git clone --branch 1.5.2 https://code.videolan.org/videolan/dav1d.git dav1d && \
    cd dav1d && \
    meson setup build --prefix=$PREFIX --buildtype=release --default-library=static && \
    meson compile -C build && \
    meson install -C build && \
    pkg-config --modversion dav1d

# ------------------------------
# Build libogg (static)
# ------------------------------
RUN wget https://downloads.xiph.org/releases/ogg/libogg-1.3.5.tar.gz \
    && tar xzf libogg-1.3.5.tar.gz \
    && cd libogg-1.3.5 \
    && ./configure \
        --prefix=$PREFIX \
        --enable-static \
        --disable-shared \
    && make -j$(nproc) \
    && make install

# ------------------------------
# Build libvorbis (static)
# ------------------------------
RUN wget https://downloads.xiph.org/releases/vorbis/libvorbis-1.3.7.tar.gz \
    && tar xzf libvorbis-1.3.7.tar.gz \
    && cd libvorbis-1.3.7 \
    && ./configure \
        --prefix=$PREFIX \
        --enable-static \
        --disable-shared \
    && make -j$(nproc) \
    && make install

# ------------------------------
# Build libopus (static)
# ------------------------------
RUN wget https://downloads.xiph.org/releases/opus/opus-1.5.2.tar.gz \
    && tar xzf opus-1.5.2.tar.gz \
    && cd opus-1.5.2 \
    && ./configure \
        --prefix=$PREFIX \
        --enable-static \
        --disable-shared \
        --disable-doc \
        --disable-extra-programs \
    && make -j$(nproc) \
    && make install

# ------------------------------
# Build libmp3lame (static)
# ------------------------------
RUN wget https://downloads.sourceforge.net/project/lame/lame/3.100/lame-3.100.tar.gz \
    && tar xzf lame-3.100.tar.gz \
    && cd lame-3.100 \
    && ./configure \
        --prefix=$PREFIX \
        --enable-static \
        --disable-shared \
        --disable-frontend \
    && make -j$(nproc) \
    && make install

# ------------------------------
# Build expat (static)
# ------------------------------
RUN wget https://github.com/libexpat/libexpat/releases/download/R_2_6_4/expat-2.6.4.tar.gz \
    && tar xzf expat-2.6.4.tar.gz \
    && cd expat-2.6.4 \
    && ./configure \
        --prefix=$PREFIX \
        --enable-static \
        --disable-shared \
    && make -j$(nproc) \
    && make install

# ------------------------------
# Build fribidi (static)
# ------------------------------
RUN wget https://github.com/fribidi/fribidi/releases/download/v1.0.16/fribidi-1.0.16.tar.xz \
    && tar xf fribidi-1.0.16.tar.xz \
    && cd fribidi-1.0.16 \
    && ./configure \
        --prefix=$PREFIX \
        --enable-static \
        --disable-shared \
    && make -j$(nproc) \
    && make install

# ------------------------------
# Build harfbuzz (static)
# ------------------------------
RUN wget https://github.com/harfbuzz/harfbuzz/releases/download/10.1.0/harfbuzz-10.1.0.tar.xz \
    && tar xf harfbuzz-10.1.0.tar.xz \
    && cd harfbuzz-10.1.0 \
    && meson setup build --prefix=$PREFIX --buildtype=release --default-library=static \
    && meson compile -C build \
    && meson install -C build

# ------------------------------
# Build libfreetype (static)
# ------------------------------
RUN wget https://download.savannah.gnu.org/releases/freetype/freetype-2.13.3.tar.gz \
    && tar xzf freetype-2.13.3.tar.gz \
    && cd freetype-2.13.3 \
    && ./configure \
        --prefix=$PREFIX \
        --enable-static \
        --disable-shared \
    && make -j$(nproc) \
    && make install

# ------------------------------
# Build fontconfig (static)
# ------------------------------
RUN wget https://www.freedesktop.org/software/fontconfig/release/fontconfig-2.15.0.tar.gz \
    && tar xzf fontconfig-2.15.0.tar.gz \
    && cd fontconfig-2.15.0 \
    && ./configure \
        --prefix=$PREFIX \
        --enable-static \
        --disable-shared \
    && make -j$(nproc) \
    && make install

# ------------------------------
# Build libass (static)
# ------------------------------
RUN wget https://github.com/libass/libass/releases/download/0.17.3/libass-0.17.3.tar.gz \
    && tar xzf libass-0.17.3.tar.gz \
    && cd libass-0.17.3 \
    && ./configure \
        --prefix=$PREFIX \
        --enable-static \
        --disable-shared \
    && make -j$(nproc) \
    && make install

# ------------------------------
# Build libwebp (static)
# ------------------------------
RUN wget https://storage.googleapis.com/downloads.webmproject.org/releases/webp/libwebp-1.4.0.tar.gz \
    && tar xzf libwebp-1.4.0.tar.gz \
    && cd libwebp-1.4.0 \
    && ./configure \
        --prefix=$PREFIX \
        --enable-static \
        --disable-shared \
    && make -j$(nproc) \
    && make install



# ------------------------------
# Build libvpx (static)
# ------------------------------
RUN git clone --depth 1 --branch v1.14.1 https://chromium.googlesource.com/webm/libvpx \
    && cd libvpx \
    && ./configure \
        --prefix=$PREFIX \
        --enable-static \
        --disable-shared \
        --disable-examples \
        --disable-unit-tests \
        --enable-vp9-highbitdepth \
        --as=yasm \
    && make -j$(nproc) \
    && make install

# ------------------------------
# Build libtheora (static)
# ------------------------------
RUN wget https://downloads.xiph.org/releases/theora/libtheora-1.1.1.tar.bz2 \
    && tar xjf libtheora-1.1.1.tar.bz2 \
    && cd libtheora-1.1.1 \
    && wget -O config.guess 'https://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.guess;hb=HEAD' \
    && wget -O config.sub 'https://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.sub;hb=HEAD' \
    && ./configure \
        --prefix=$PREFIX \
        --enable-static \
        --disable-shared \
        --disable-examples \
    && make -j$(nproc) \
    && make install

# ------------------------------
# Build libaom (static)
# ------------------------------
RUN git clone --depth 1 --branch v3.10.0 https://aomedia.googlesource.com/aom \
    && cd aom \
    && mkdir -p build && cd build \
    && cmake .. \
        -DCMAKE_BUILD_TYPE=Release \
        -DBUILD_SHARED_LIBS=OFF \
        -DENABLE_TESTS=OFF \
        -DENABLE_EXAMPLES=OFF \
        -DENABLE_DOCS=OFF \
        -DCMAKE_INSTALL_PREFIX=$PREFIX \
    && make -j$(nproc) \
    && make install

# ------------------------------
# Build libfdk-aac (static)
# ------------------------------
RUN git clone --depth 1 --branch v2.0.3 https://github.com/mstorsjo/fdk-aac.git \
    && cd fdk-aac \
    && ./autogen.sh \
    && ./configure \
        --prefix=$PREFIX \
        --enable-static \
        --disable-shared \
    && make -j$(nproc) \
    && make install

# ------------------------------
# Build FFmpeg stable version
# ------------------------------
RUN wget https://github.com/FFmpeg/FFmpeg/archive/refs/tags/n7.1.2.tar.gz \
    && tar xvf n7.1.2.tar.gz \
    && cd FFmpeg-n7.1.2 \
    && ./configure \
        --prefix=$PREFIX \
        --enable-gpl \
        --enable-nonfree \
        --enable-static \
        --disable-shared \
        --pkg-config-flags="--static" \
        --enable-pthreads \
        --enable-zlib \
        --disable-doc \
        --disable-debug \
        --enable-lto \
        --disable-vaapi \
        --disable-vdpau \
        --disable-outdevs \
        --disable-decoder=atrac3 \
        --disable-muxer=vc1 \
        --disable-demuxer=vc1 \
        --disable-parser=vc1 \
        --enable-libopus \
        --enable-libvorbis \
        --enable-libmp3lame \
        --enable-libx264 \
        --enable-libx265 \
        --enable-libsvtav1 \
        --enable-libdav1d \
        --enable-libvpx \
        --enable-libtheora \
        --enable-libaom \
        --enable-libfdk-aac \
        --enable-libass \
        --enable-libfreetype \
        --enable-fontconfig \
        --enable-libwebp \
        --disable-ffplay \
        --enable-pic \
        ${FFMPEG_EXTRA_ARGS} \
    && make -j$(nproc) \
    && make install

# ------------------------------
# Compress binaries with UPX
# ------------------------------
# RUN upx --best --lzma /usr/local/bin/ffmpeg /usr/local/bin/ffprobe || true

# ===============================
# Stage 2: Runtime
# ===============================
FROM alpine:3.22

# Copy only the compiled binaries from builder
COPY --from=builder /usr/local/bin/ffmpeg /usr/local/bin/ffmpeg
COPY --from=builder /usr/local/bin/ffprobe /usr/local/bin/ffprobe

# Install only runtime dependencies (minimal)
RUN apk add --no-cache \
    libstdc++ \
    libgcc

RUN ffmpeg -version \
    && ffprobe -version

CMD ["ffmpeg", "-version"]