FFmpeg Rockchip encapsulates the hardware-accelerated video codec library MPP from Rockchip, allowing for easier use of Rockchip’s hardware-accelerated video encoding and decoding capabilities through FFmpeg’s command line and API. FFmpeg Rockchip depends on Rockchip’s MPP and librga libraries, so we first need to cross-compile the MPP and librga libraries.
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Compilation Environment
The compilation system is Fedora 43, and the cross-compilation toolchain uses the system’s built-in packages aarch64-linux-gnu-gcc and clang. The compilation uses sysroot, which utilizes the arm64 sysroot from the WebRTC source library. The method to obtain it is:
cd webrtc-checkout/src/build/linux/sysroot_scripts./install-sysroot.py --arch arm64 It will automatically download the sysroot. Of course, the network must be accessible; otherwise, it cannot be downloaded.
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MPP Compilation
Download the official source code:
git clone https://github.com/rockchip-linux/mpp.gitModify build/linux/aarch64/arm.linux.cross.cmake to add sysroot
SET(sysroot webrtc-checkout/src/build/linux/debian_bullseye_arm64-sysroot) set(CMAKE_SYSROOT ${sysroot})Modify CMakeLists.txt to add the include directory of sysroot
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -O3 -DNDEBUG -I${sysroot}/usr/include/aarch64-linux-gnu") set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O3 -DNDEBUG -I${sysroot}/usr/include/aarch64-linux-gnu") Then compile and install to the specified path.
- librga Compilation
Download the community-maintained source code
git clone -b jellyfin-rga --depth=1 https://github.com/nyanmisaka/rk-mirrors.git rkrgaInitially, I compiled using the gcc toolchain, but there were always linking errors with the compiled libraries. I couldn’t find the cause of the errors, but switching to clang resolved the linking issues. Modify toolchains/toolchain_linux.cmake to add sysroot and change to clang compilation
SET(sysroot webrtc-checkout/src/build/linux/debian_bullseye_arm64-sysroot) set(CMAKE_SYSROOT ${sysroot}) SET(CMAKE_C_COMPILER /usr/bin/clang) SET(CMAKE_CXX_COMPILER /usr/bin/clang) SET(CMAKE_SYSTEM_PROCESSOR "armv8-a") set(triple aarch64-linux-gnu) set(CMAKE_C_COMPILER_TARGET ${triple}) set(CMAKE_CXX_COMPILER_TARGET ${triple}) Modify CMakeLists.txt to add the include directory of sysroot
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -O2 -pthread -I${sysroot}/usr/include/aarch64-linux-gnu -I${sysroot}/usr/include/c++/10 -I${sysroot}/usr/include/aarch64-linux-gnu/c++/10") set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -O2 -pthread -lm -Wno-unused-command-line-argument -I${sysroot}/usr/include/aarch64-linux-gnu") Then compile and install to the specified path.
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FFmpeg Rockchip Compilation
Download the source code
git clone --depth=1 https://github.com/nyanmisaka/ffmpeg-rockchip.git ffmpegCompilation configuration
SYSROOT=webrtc-checkout/src/build/linux/debian_bullseye_arm64-sysroot TARGET=aarch64-linux-gnu
pkg_config=$(which pkg-config) PKG_CONFIG_PATH=/path/to/mpp/lib/pkgconfig
./configure --prefix=/home/lisi/work/rock/sysroot/usr --enable-cross-compile --cross-prefix=aarch64-linux-gnu-
--arch=aarch64 --target-os=linux --sysroot=$SYSROOT --extra-cflags="-I$SYSROOT/usr/include/$TARGET -I$SYSROOT/usr/include/libdrm"
--extra-ldflags="-L$SYSROOT/usr/lib/$TARGET" --enable-gpl --enable-version3 --enable-libdrm --enable-rkmpp --enable-rkrga
--disable-static --enable-shared<span>Note that PKG_CONFIG_PATH should be configured to the installation location of the mpp and librga compiled libraries. After installing librga, there is no pc file, so I wrote a librga.pc file similar to mpp's pc file.</span>
exec_prefix=${prefix} libdir=${prefix}/lib includedir=${prefix}/include Name: librga Description: librga Requires.private: Version: 1.0 Libs: -L${libdir} -lrga -lstdc++ Libs.private: Cflags: -I${includedir}After configuring, you can compile and install<span> FFmpeg Rockchip.</span>