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• Warning "i686-mingw32-pkg-config not found, library detection may fail" while cross compiling ffmpeg

  1er juillet 2019, par S B

  I get the following warning while trying to cross compile ffmpeg as below

  $ ./configure --enable-gpl --enable-version3 --enable-libgsm --enable-libvorbis --enable-libtheora --enable-libspeex --enable-libmp3lame --enable-libopenjpeg --enable-libopencore_amrwb --enable-libopencore_amrnb --arch=x86 --enable-runtime-cpudetect --enable-static --disable-shared --enable-libxvid --enable-libx264 --target-os=mingw32 --enable-avisynth --enable-w32threads --cross-prefix=i686-mingw32- --cc='i686-mingw32-gcc' --enable-memalign-hack --disable-doc --enable-avfilter --disable-ffplay --disable-ffserver --disable-ffprobe

  Configure ran fine but with the following warning

  License: GPL version 3 or later
  
  Creating config.mak and config.h...
  
  libavutil/avconfig.h is unchanged
  
  
  
  WARNING: i686-mingw32-pkg-config not found, library detection may fail.

  How do I provide i686-mingw32-pkg-config to configure ?

• Android NDK Cross Compile FFmpeg, dlopen failed : cannot locate symbol

  23 août 2019, par binglingziyu

  Android NDK-r20 cross compile FFmpeg4.2 success, but my app crash with

  UnsatisfiedLinkError : dlopen failed : cannot locate symbol
  __aeabi_idiv

  This is the ffmpeg4.2 source code with my "build_android.sh"

  ffmpeg-android-build

  config the NDK r20 root path in "build_android.sh"
  
  $ cd ffmpeg-android-build
  
  $ ./build_android.sh
  
  $ make -j 4
  
  $ make install

  This is my android project to test the ffmpeg

  ffmpeg-android-test

  Seemed the solution，don’t know how to do in my situation

  #cannot-locate-symbols

  Excepted

  1. NDK-r20 and FFmpeg-4.2 is needed (cant change the version)
  2. My android test project run

• ffmpeg cross compiles nicely for aarch64, but when linking with my project, gives Relocations in generic ELF (EM : 62)

  29 août 2019, par Lucas Zanella

  Here’s how I’m configuring ffmpeg :

          ./configure \
  
          --prefix=${BUILD_DIR}/desktop/aarch64 \
  
          --disable-doc \
  
          --enable-cross-compile \
  
          --cross-prefix=aarch64-linux-gnu-\
  
          --target-os=linux \
  
          --arch=aarch64 \
  
          --extra-cflags="-O3 -fPIC" \
  
          --enable-shared \
  
          --disable-static \
  
          --disable-debug \
  
          --disable-runtime-cpudetect \
  
          --disable-programs \
  
          --disable-muxers \
  
          --disable-encoders \
  
          --disable-decoders \
  
          ${DECODERS_TO_ENABLE} \
  
          --disable-bsfs \
  
          --disable-pthreads \
  
          --disable-avdevice \
  
          --disable-network \
  
          --disable-postproc 
  
  
  
          make clean
  
          make -j$(nproc)
  
          make install

  It compiles fine. Then, when I try to link my project with this compiled ffmpeg, it gives me

  /usr/bin/ld: ../../../deps/ffmpeg/build/desktop/aarch64/lib/libavcodec.a(allcodecs.o): Relocations in generic ELF (EM: 62)
  
  /usr/bin/ld: ../../../deps/ffmpeg/build/desktop/aarch64/lib/libavcodec.a(allcodecs.o): Relocations in generic ELF (EM: 62)
  
  /usr/bin/ld: ../../../deps/ffmpeg/build/desktop/aarch64/lib/libavcodec.a(allcodecs.o): Relocations in generic ELF (EM: 62)
  
  /usr/bin/ld: ../../../deps/ffmpeg/build/desktop/aarch64/lib/libavcodec.a(allcodecs.o): Relocations in generic ELF (EM: 62)
  
  /usr/bin/ld: ../../../deps/ffmpeg/build/desktop/aarch64/lib/libavcodec.a(allcodecs.o): Relocations in generic ELF (EM: 62)
  
  /usr/bin/ld: ../../../deps/ffmpeg/build/desktop/aarch64/lib/libavcodec.a(allcodecs.o): Relocations in generic ELF (EM: 62)
  
  /usr/bin/ld: ../../../deps/ffmpeg/build/desktop/aarch64/lib/libavcodec.a(allcodecs.o): Relocations in generic ELF (EM: 62)
  
  /usr/bin/ld: ../../../deps/ffmpeg/build/desktop/aarch64/lib/libavcodec.a(allcodecs.o): Relocations in generic ELF (EM: 62)
  
  /usr/bin/ld: ../../../deps/ffmpeg/build/desktop/aarch64/lib/libavcodec.a(allcodecs.o): Relocations in generic ELF (EM: 62)
  
  ../../../deps/ffmpeg/build/desktop/aarch64/lib/libavcodec.a: error adding symbols: File in wrong format

  In this answer : https://stackoverflow.com/a/23185739/10116440 he says that CC is missing. I’m also not using CC but shouldn’t CC be the same as --cross-prefix ?

  I also found http://lakm.us/logit/2012/11/cross-compiling-ubuntu-arm-ffmpeg/ in where he says that I should use --cross-prefix=arm-linux-gnueabi-, in my case arm should be aarch64. However, there’s no aarch64-linux-gnueabi- toolchain, only aarch64-linux-gnu-. Can it be the problem ? I think no because eabi looks like its for 32 bits, I guess

  It’s worth noticing that I’m bulding ffmpeg on a amd64 but using the static library to build my project on a aarch64.