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• Cross compile FFmpeg with openssl and libsrt by android ndk

  25 janvier 2024, par Mingy

  I am trying to cross-compile FFmpeg using the Android NDK and enable support for OpenSSL and libsrt. After separately compiling OpenSSL and libsrt, when configuring FFmpeg, pkg-config cannot correctly locate the installed OpenSSL and libsrt libraries.

  


  Here are my compilation scripts.
OpenSSL 3.1.4

  


  #!/bin/bash

if [[ ! -d "./openssl" ]]; then
    git clone --depth 1 --branch openssl-3.1.4 https://github.com/openssl/openssl.git
fi

cd openssl

export ANDROID_NDK_ROOT=/home/albert/workspace/DevKit/android/SDK/ndk/25.1.8937393/
PATH=$ANDROID_NDK_ROOT/toolchains/llvm/prebuilt/linux-x86_64/bin:$PATH

rm -rf ./android
make clean

./Configure android-arm64 \
 -D__ANDROID_API__=28 \
--prefix=$PWD/android/arm64-v8a

make -j $(grep "cpu cores" /proc/cpuinfo | wc -l)
make install

cd ..


  


  libsrt 1.5.3

  


  #!/bin/bash

if [[ ! -d "./srt" ]]; then
    git clone --depth 1 --branch v1.5.3 https://github.com/Haivision/srt.git
fi

export OpenSSL_INSTALL_DIR=$PWD/openssl/android/arm64-v8a

cd srt

rm -rf ./android
make clean

./configure --use-enclib=openssl \
--use-openssl-pc=OFF \
--OPENSSL_INCLUDE_DIR=$OpenSSL_INSTALL_DIR/include \
--OPENSSL_CRYPTO_LIBRARY=$OpenSSL_INSTALL_DIR/lib/libcrypto.a \
--OPENSSL_SSL_LIBRARY=$OpenSSL_INSTALL_DIR/lib/libssl.a \
--CMAKE_PREFIX_PATH=$PWD/install/android/arm64-v8a \
--CMAKE_INSTALL_PREFIX=$PWD/install/android/arm64-v8a \
--CMAKE_ANDROID_NDK=/home/albert/workspace/DevKit/android/SDK/ndk/25.1.8937393 \
--CMAKE_SYSTEM_NAME=Android \
--CMAKE_SYSTEM_VERSION=28 \
--CMAKE_ANDROID_ARCH_ABI=arm64-v8a \
--CMAKE_C_FLAGS="-fPIC" \
--enable-c++11 \
--enable-stdcxx-sync \
--enable-debug=2 \
--enable-logging=0 \
--enable-heavy-logging=0 \
--enable-apps=0

make -j $(grep "cpu cores" /proc/cpuinfo | wc -l)
make install

cd ..


  


  Then I put those install dir to PKG_CONFIG_PATH

  


  export PKG_CONFIG_PATH=$PKG_CONFIG_PATH:$PWD/openssl/android/arm64-v8a/lib/pkgconfig:$PWD/srt/install/android/arm64-v8a/lib/pkgconfig


  


  Upon testing, both OpenSSL and SRT can successfully retrieve the version and corresponding linking symbols.

  


  But, When I'm going to configure FFmpeg, Error Occurred

  


  My FFmpeg configurtion script

  


  TOOLCHAIN=/home/albert/workspace/DevKit/android/SDK/ndk/25.1.8937393/toolchains/llvm/prebuilt/linux-x86_64
API=28

./configure \
 --prefix=$PWD/android/arm64-v8a \
 --disable-neon \
 --disable-hwaccels \
 --disable-gpl \
 --disable-postproc \
 --enable-static \
 --enable-jni \
 --disable-mediacodec \
 --disable-decoder=h264_mediacodec \
 --disable-doc \
 --disable-programs \
 --disable-ffmpeg \
 --disable-ffplay \
 --disable-ffprobe \
 --disable-avdevice \
 --disable-symver \
 --cross-prefix=$TOOLCHAIN/bin/llvm- \
 --target-os=android \
 --arch=arm64 \
 --cpu=armv8-a \
 --cc=$TOOLCHAIN/bin/aarch64-linux-android$API-clang \
 --cxx=$TOOLCHAIN/bin/aarch64-linux-android$API-clang++ \
 --enable-cross-compile \
 --sysroot=$TOOLCHAIN/sysroot \
 --enable-version3 \
 --enable-openssl \
 --enable-libsrt \
 --extra-cflags="-DVK_ENABLE_BETA_EXTENSIONS=0 -mno-stackrealign -Os -fpic -march=armv8-a " \
 --extra-ldflags="" \
 $ADDITIONAL_CONFIGURE_FLAG


  


  ERROR: srt >= 1.3.0 not found using pkg-config


  


  config.log

  


  require_pkg_config libsrt srt >= 1.3.0 srt/srt.h srt_socket
check_pkg_config libsrt srt >= 1.3.0 srt/srt.h srt_socket
test_pkg_config libsrt srt >= 1.3.0 srt/srt.h srt_socket
false --exists --print-errors srt >= 1.3.0
ERROR: srt >= 1.3.0 not found using pkg-config


  


  If only enable OpenSSL, then get Error

  


  ERROR: OpenSSL <3.0.0 is incompatible with the gpl


  


  config.log

  


  check_pkg_config openssl openssl >= 3.0.0 openssl/ssl.h OPENSSL_init_ssl
test_pkg_config openssl openssl >= 3.0.0 openssl/ssl.h OPENSSL_init_ssl
false --exists --print-errors openssl >= 3.0.0
ERROR: OpenSSL <3.0.0 is incompatible with the gpl


  


• FFmpeg 32-bit DLLs fail to load on Windows when switching target platform to 32-bit in C# project (Linux cross-compile with MinGW)

  8 novembre 2024, par ryan

  I’m working on a C# project in Windows that integrates FFmpeg DLLs. I need both 32-bit and 64-bit FFmpeg DLLs. The 64-bit DLLs load and work fine, but when I change the target platform in my project settings to 32-bit, some 32-bit DLLs (specifically avfilter-7.dll) fail to load, even though they’re in the correct directory.

  


  Code :

  


  case PlatformID.Win32Windows:
    return WindowsNativeMethods.LoadLibrary(libraryName);


  


  is returning a null pointer for avfilter-7.dll.

  


  Error Received :

  


  System.Runtime.InteropServices.Marshal.GetLastWin32Error() = 0x0000007e 


  


  Which I think translates to ERROR_MOD_NOT_FOUND.

  


  Environment & Context :

  


  

  • Linux VM : Using a Linux virtual machine to cross-compile FFmpeg for Windows.

  


  • Tool : ffmpeg-windows-build-helpers script from https://github.com/rdp/ffmpeg-windows-build-helpers.

  


  • Cross-Compiler : MinGW (latest version installed on VM).

  


  • Target Architectures : Both 32-bit and 64-bit DLLs for Windows.

  


  • FFmpeg Version : n4.4.5 (using —ffmpeg-git-checkout-version=n4.4.5).

  


  


  Compilation Command :
Using the helper script, I’ve tried the following command to generate the 32 and 64 bit shared libraries :

  


  ./cross_compile_ffmpeg.sh --ffmpeg-git-checkout-version=n4.4.5 --disable-nonfree=y --build-libmxf=n --build-mp4box=n --build-vlc=n --build-svt-hevc=n --build-svt-vp9=n --build-dvbtee=n --build-dependencies=y --build-mplayer=n --build-ffmpeg-static=n --build-ffmpeg-shared=y --prefer-stable=y --build-x264-with-libav=n


  


  I’ve also updated MinGW to the latest version on the VM to ensure compatibility.

  


  Questions :

  


  

  1. What might be causing the 32-bit FFmpeg DLLs (like avfilter-7.dll) to fail to load on a Windows platform, while 64-bit DLLs work fine ?

  


  2. Are there specific flags or steps in the build process needed to ensure compatibility for 32-bit FFmpeg DLLs in a 64-bit Windows environment ?

  


  3. Are there common pitfalls when cross-compiling 32-bit and 64-bit FFmpeg DLLs with MinGW on Linux that could cause these loading issues ?

  


  


  Any insights or additional troubleshooting tips would be greatly appreciated !

  


• Streaming is not save on wowza server

  19 septembre 2015, par Android

  I have issue with streaming save to server.
  We have two case :

  case 1.
  I have got one problem on streaming by Javacv with ffmpeg, streaming is work fine and i can see in wowza testing as well as vlc
  But that streaming is not save in wowza server, only save audio file in server.

  case 2.
  I have done streaming by livestreaming library and that work fine as well as save in wowza server.

  both case server is used same but one time it work fine other time it not.

  I have checked settings in wowza server to save any stream and it perfect everything.