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• Ffmpeg linking problems using CMake

  7 décembre 2013, par Zoellick

  I'm writing an application containig 2 internal libraries and depends on more 2 external libraries (ffmpeg and opencv). I'm also using CMake to produce UNIX makefiles. And the problem is when i'm trying to build sources, it compiles but don't link with ffmpeg at all and the next output the linker gives :

  ../../Decoder/libDecoder.a(ConverterAVFrameToRGB.cpp.o): In function `FaceVideo::ConverterAVFrameToRGB::to_rgb_conversion(std::vector >&, int, int, int)':
  
  ConverterAVFrameToRGB.cpp:(.text+0x990): undefined reference to `av_frame_free'
  
  ../../Decoder/libDecoder.a(FfmpegDecoder.cpp.o): In function `FaceVideo::FfmpegDecoder::destroy()':
  
  FfmpegDecoder.cpp:(.text+0xa30): undefined reference to `av_frame_free'
  
  ../../Decoder/libDecoder.a(FfmpegDecoder.cpp.o): In function `FaceVideo::FfmpegDecoder::decode_next_chunk(int)':
  
  FfmpegDecoder.cpp:(.text+0xb6b): undefined reference to `av_frame_clone'
  
  FfmpegDecoder.cpp:(.text+0xc13): undefined reference to `av_frame_free'
  
  ../../Decoder/libDecoder.a(FfmpegEncoder.cpp.o): In function `FaceVideo::FfmpegEncoder::destroy()':
  
  FfmpegEncoder.cpp:(.text+0x132): undefined reference to `avcodec_free_frame'
  
  ../../Decoder/libDecoder.a(FfmpegEncoder.cpp.o): In function `FaceVideo::FfmpegEncoder::encode()':
  
  FfmpegEncoder.cpp:(.text+0x4c4): undefined reference to `avcodec_encode_video2'
  
  FfmpegEncoder.cpp:(.text+0x592): undefined reference to `avcodec_encode_video2'
  
  ../../Decoder/libDecoder.a(FrameSaver.cpp.o): In function `FaceVideo::FrameSaver::saver(std::vector >&, int, int, int)':
  
  FrameSaver.cpp:(.text+0x869): undefined reference to `av_frame_free'
  
  collect2: ld returned 1 exit status

  That's excatly what i don't want to see.

  There are three Cmake files : two for internal libraries (use

  add_library(Decoder ${SOURCES_DECODER})
  
               and 
  
  add_library(Detector ${SOURCES_DETECTOR})

  in them) and one for main executable (use

  add_executable(Tool ${SOURCES_TOOL})
  
               and
  
  target_link_libraries (Tool Decoder avutil avcodec swscale avformat Detector ${OpenCV_LIBS})

  in it).

  As far as i understand from CMake manuals and examples, this should make linker link this libraries together, but no effect.

  I've been trying lot of things such as :
  1) Adding link_directories() with path to libraries (/usr/lib/x86_64-linux-gnu/ for me) wherever it's possile, nothing changed.
  2) Linking every library separately, i mean i tried do something like this in my internal libraries CMake files : target_link_libraries (Decoder avutil avcodec swscale avformat). And then link library together into my Tool CMake file : target_link_libraries (Tool Decoder Detector).
  3) Editing output makefiles.
  4) Compiling simple one-file application just to test whether i can do it or not. I can. g++ -lavcodec -o out mysource.cpp works perfectly.
  5) Compling ffmpeg manually and installing it.

  The fact is i realy don't know what should i do. I have no idea. And i would very appreciate your every answer.

  UPD1 :
  Output when CMAKE_VERBOSE_MAKEFILE is set

   !
  /usr/bin/c++ -march=x86-64 -Wall -fPIC -pthread -std=c++0x -D__STDC_CONSTANT_MACROS -march=x86-64 -fPIC CMakeFiles/FaceDetectorTool.dir/home/anton/Programming/facevideo/branches/Stream_Prototype/src/tools/FaceDetectorTool/facedetector.cpp.o -o FaceDetectorTool -rdynamic ../../Detector/libDetector.a ../../Decoder/libDecoder.a -lavutil -lavcodec -lswscale -lavformat /usr/local/lib/libopencv_videostab.so.2.4.7 /usr/local/lib/libopencv_video.so.2.4.7 /usr/local/lib/libopencv_ts.a /usr/local/lib/libopencv_superres.so.2.4.7 /usr/local/lib/libopencv_stitching.so.2.4.7 /usr/local/lib/libopencv_photo.so.2.4.7 /usr/local/lib/libopencv_ocl.so.2.4.7 /usr/local/lib/libopencv_objdetect.so.2.4.7 /usr/local/lib/libopencv_nonfree.so.2.4.7 /usr/local/lib/libopencv_ml.so.2.4.7 /usr/local/lib/libopencv_legacy.so.2.4.7 /usr/local/lib/libopencv_imgproc.so.2.4.7 /usr/local/lib/libopencv_highgui.so.2.4.7 /usr/local/lib/libopencv_gpu.so.2.4.7 /usr/local/lib/libopencv_flann.so.2.4.7 /usr/local/lib/libopencv_features2d.so.2.4.7 /usr/local/lib/libopencv_core.so.2.4.7 /usr/local/lib/libopencv_contrib.so.2.4.7 /usr/local/lib/libopencv_calib3d.so.2.4.7 -ldl -lm -lpthread -lrt /usr/local/lib/libopencv_nonfree.so.2.4.7 /usr/local/lib/libopencv_ocl.so.2.4.7 /usr/local/lib/libopencv_gpu.so.2.4.7 /usr/local/lib/libopencv_photo.so.2.4.7 /usr/local/lib/libopencv_objdetect.so.2.4.7 /usr/local/lib/libopencv_legacy.so.2.4.7 /usr/local/lib/libopencv_video.so.2.4.7 /usr/local/lib/libopencv_ml.so.2.4.7 /usr/local/lib/libopencv_calib3d.so.2.4.7 /usr/local/lib/libopencv_features2d.so.2.4.7 /usr/local/lib/libopencv_highgui.so.2.4.7 /usr/local/lib/libopencv_imgproc.so.2.4.7 /usr/local/lib/libopencv_flann.so.2.4.7 /usr/local/lib/libopencv_core.so.2.4.7 -Wl,-rpath,/usr/local/lib

  UPD2
  Cmake example looks like that.

  cmake_minimum_required (VERSION 2.8)
  
  project (Decoder)
  
  include(../CMakeInit.cmake)
  
  include_directories(${FFMPEG_INCLUDE_DIR})
  
  include_directories(${Stream_Facevideo_SOURCE_DIR}/../src/kernel/decoder/)
  
  include_directories(${Stream_Facevideo_SOURCE_DIR}/../src/kernel/stuff/)
  
  set(SOURCES_VIDEODECODER
  
              *sources*
  
    )
  
  
  
  if(WINDOWS)
  
      set(SOURCES_VIDEODECODER    ${SOURCES_VIDEODECODER} 
  
              *headers*                           
  
      )
  
  endif(WINDOWS)
  
  
  
  set (SOURCES_DECODER
  
      ${SOURCES_VIDEODECODER}
  
  )
  
  
  
  add_library(Decoder ${SOURCES_DECODER})
  
  link_directories("/usr/lib/x86_64-linux-gnu/")
  
  target_link_libraries(Decoder swscale avformat avcodec avutil)

• Linking problems using CMake

  5 décembre 2013, par Zoellick

  I'm writing an application containig 2 internal libraries and depends on more 2 external libraries (ffmpeg and opencv). I'm also using CMake to produce UNIX makefiles. And the problem is when i'm trying to build sources, it compiles but don't link with ffmpeg at all and the next output the linker gives :

  ../../Decoder/libDecoder.a(ConverterAVFrameToRGB.cpp.o): In function `FaceVideo::ConverterAVFrameToRGB::to_rgb_conversion(std::vector >&, int, int, int)':
  
  ConverterAVFrameToRGB.cpp:(.text+0x990): undefined reference to `av_frame_free'
  
  ../../Decoder/libDecoder.a(FfmpegDecoder.cpp.o): In function `FaceVideo::FfmpegDecoder::destroy()':
  
  FfmpegDecoder.cpp:(.text+0xa30): undefined reference to `av_frame_free'
  
  ../../Decoder/libDecoder.a(FfmpegDecoder.cpp.o): In function `FaceVideo::FfmpegDecoder::decode_next_chunk(int)':
  
  FfmpegDecoder.cpp:(.text+0xb6b): undefined reference to `av_frame_clone'
  
  FfmpegDecoder.cpp:(.text+0xc13): undefined reference to `av_frame_free'
  
  ../../Decoder/libDecoder.a(FfmpegEncoder.cpp.o): In function `FaceVideo::FfmpegEncoder::destroy()':
  
  FfmpegEncoder.cpp:(.text+0x132): undefined reference to `avcodec_free_frame'
  
  ../../Decoder/libDecoder.a(FfmpegEncoder.cpp.o): In function `FaceVideo::FfmpegEncoder::encode()':
  
  FfmpegEncoder.cpp:(.text+0x4c4): undefined reference to `avcodec_encode_video2'
  
  FfmpegEncoder.cpp:(.text+0x592): undefined reference to `avcodec_encode_video2'
  
  ../../Decoder/libDecoder.a(FrameSaver.cpp.o): In function `FaceVideo::FrameSaver::saver(std::vector >&, int, int, int)':
  
  FrameSaver.cpp:(.text+0x869): undefined reference to `av_frame_free'
  
  collect2: ld returned 1 exit status

  That's excatly what i don't want to see.

  There are three Cmake files : two for internal libraries (use

  add_library(Decoder ${SOURCES_DECODER})
  
               and 
  
  add_library(Detector ${SOURCES_DETECTOR})

  in them) and one for main executable (use

  add_executable(Tool ${SOURCES_TOOL})
  
               and
  
  target_link_libraries (Tool Decoder avutil avcodec swscale avformat Detector ${OpenCV_LIBS})

  in it).

  As far as i understand from CMake manuals and examples, this should make linker link this libraries together, but no effect.

  I've been trying lot of things such as :
  1) Adding link_directories() with path to libraries (/usr/lib/x86_64-linux-gnu/ for me) wherever it's possile, nothing changed.
  2) Linking every library separately, i mean i tried do something like this in my internal libraries CMake files : target_link_libraries (Decoder avutil avcodec swscale avformat). And then link library together into my Tool CMake file : target_link_libraries (Tool Decoder Detector).
  3) Editing output makefiles.
  4) Compiling simple one-file application just to test whether i can do it or not. I can. g++ -lavcodec -o out mysource.cpp works perfectly.
  5) Compling ffmpeg manually and installing it.

  The fact is i realy don't know what should i do. I have no idea. And i would very appreciate your every answer.

  Output when CMAKE_VERBOSE_MAKEFILE is set

   !
  /usr/bin/c++ -march=x86-64 -Wall -fPIC -pthread -std=c++0x -D__STDC_CONSTANT_MACROS -march=x86-64 -fPIC CMakeFiles/FaceDetectorTool.dir/home/anton/Programming/facevideo/branches/Stream_Prototype/src/tools/FaceDetectorTool/facedetector.cpp.o -o FaceDetectorTool -rdynamic ../../Detector/libDetector.a ../../Decoder/libDecoder.a -lavutil -lavcodec -lswscale -lavformat /usr/local/lib/libopencv_videostab.so.2.4.7 /usr/local/lib/libopencv_video.so.2.4.7 /usr/local/lib/libopencv_ts.a /usr/local/lib/libopencv_superres.so.2.4.7 /usr/local/lib/libopencv_stitching.so.2.4.7 /usr/local/lib/libopencv_photo.so.2.4.7 /usr/local/lib/libopencv_ocl.so.2.4.7 /usr/local/lib/libopencv_objdetect.so.2.4.7 /usr/local/lib/libopencv_nonfree.so.2.4.7 /usr/local/lib/libopencv_ml.so.2.4.7 /usr/local/lib/libopencv_legacy.so.2.4.7 /usr/local/lib/libopencv_imgproc.so.2.4.7 /usr/local/lib/libopencv_highgui.so.2.4.7 /usr/local/lib/libopencv_gpu.so.2.4.7 /usr/local/lib/libopencv_flann.so.2.4.7 /usr/local/lib/libopencv_features2d.so.2.4.7 /usr/local/lib/libopencv_core.so.2.4.7 /usr/local/lib/libopencv_contrib.so.2.4.7 /usr/local/lib/libopencv_calib3d.so.2.4.7 -ldl -lm -lpthread -lrt /usr/local/lib/libopencv_nonfree.so.2.4.7 /usr/local/lib/libopencv_ocl.so.2.4.7 /usr/local/lib/libopencv_gpu.so.2.4.7 /usr/local/lib/libopencv_photo.so.2.4.7 /usr/local/lib/libopencv_objdetect.so.2.4.7 /usr/local/lib/libopencv_legacy.so.2.4.7 /usr/local/lib/libopencv_video.so.2.4.7 /usr/local/lib/libopencv_ml.so.2.4.7 /usr/local/lib/libopencv_calib3d.so.2.4.7 /usr/local/lib/libopencv_features2d.so.2.4.7 /usr/local/lib/libopencv_highgui.so.2.4.7 /usr/local/lib/libopencv_imgproc.so.2.4.7 /usr/local/lib/libopencv_flann.so.2.4.7 /usr/local/lib/libopencv_core.so.2.4.7 -Wl,-rpath,/usr/local/lib

• FFMPEG build for android on ubuntu

  23 février 2014, par james

  I am developing a media app which provides support for all video formats for implementing this feature we require FFMPEG the very best library for codecs. Compiling FFMPEG on windows for android is very long battle so I migrated to ubuntu I have almost compiled it shows the the binaries but it gives at last point following message

  >AR libpostproc/libpostproc.a
  
  AR  libswresample/libswresample.a
  
  AR  libswscale/libswscale.a
  
  AR  libavcodec/libavcodec.a
  
  AR  libavutil/libavutil.a
  
  INSTALL libavfilter/libavfilter.a
  
  INSTALL libavformat/libavformat.a
  
  INSTALL libavresample/libavresample.a
  
  INSTALL libpostproc/libpostproc.a
  
  INSTALL libswresample/libswresample.a
  
  INSTALL libswscale/libswscale.a
  
  INSTALL libavutil/libavutil.a
  
  LD  ffmpeg_g
  
  INSTALL libavcodec/libavcodec.a
  
  CP  ffmpeg
  
  STRIP   ffmpeg
  
  skipping strip ffmpeg
  
  INSTALL install-progs-yes
  
  INSTALL ffmpeg
  
  /home/akshay/Desktop/android-ndk-r9c/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86/bin/arm-linux-androideabi-ld: -: unknown option

  Here is my script

  #!/bin/bash
  
  NDK=/home/akshay/Desktop/android-ndk-r9c
  
  PLATFORM=$NDK/platforms/android-8/arch-arm
  
  PREBUILT=$NDK/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86
  
  PREFIX=./android-ffmpeg
  
  function build_one
  
  {
  
      ./configure --target-os=linux --prefix=$PREFIX \
  
      --enable-cross-compile \
  
      --enable-runtime-cpudetect \
  
      --disable-asm \
  
      --arch=arm \
  
      #--cc=$PREBUILT/bin/arm-linux-androideabi-gcc \
  
      --cross-prefix=$PREBUILT/bin/arm-linux-androideabi- \
  
      --disable-stripping \
  
      #--nm=$PREBUILT/bin/arm-linux-androideabi-nm \
  
      --sysroot=$PLATFORM \
  
      --enable-nonfree \
  
      --enable-version3 \
  
      --disable-everything \
  
      --enable-gpl \
  
      --disable-doc \
  
      --enable-avresample \
  
      --enable-demuxer=rtsp \
  
      --enable-muxer=rtsp \
  
      --disable-ffplay \
  
      --disable-ffserver \
  
      --enable-ffmpeg \
  
      --disable-ffprobe \
  
      --enable-encoders \
  
      --enable-decoders \
  
      --enable-protocols \
  
      --enable-hwaccels \
  
      --enable-zlib \
  
      --disable-devices \
  
      --disable-avdevice \
  
      --extra-cflags="-I/home/android-ffmpeg/include -fPIC -DANDROID -D__thumb__ -mthumb -Wfatal-errors -Wno-deprecated -mfloat-abi=softfp -mfpu=vfpv3-d16 -marm -march=armv7-a" \
  
      --extra-ldflags="-L/home/android-ffmpeg/lib"
  
      make -j4 install
  
      $PREBUILT/bin/arm-linux-androideabi-ar d libavcodec/libavcodec.a inverse.o
  
      $PREBUILT/bin/arm-linux-androideabi-ld -rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib -L$PREFIX/lib  -soname libffmpeg.so -shared -  nostdlib  -z,noexecstack -Bsymbolic --whole-archive --no-undefined -o $PREFIX/libffmpeg.so libavcodec/libavcodec.a libavfilter/     libavfilter.a libavresample/libavresample.a libavformat/libavformat.a libavutil/libavutil.a libswscale/libswscale.a -lc -lm -lz -ldl -  llog --warn-once --dynamic-linker=/system/bin/linker $PREBUILT/lib/gcc/arm-linux-androideabi/4.8/libgcc.a
  
  }
  
  build_one

  Please tell me anything wrong in the script