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• doc : fix generating doxy with out-of-tree builds

  24 avril 2021, par Anton Khirnov

  doc : fix generating doxy with out-of-tree builds
  Broken in 753930bc7300dd595c4bab51c5a70d1da9083da4, as the path to
  
  Doxyfile passed to doxy-wrapper.sh is relative to the build dir, while
  
  the recipe cd's to the source dir before invoking the wrapper.
  

  • [DH] doc/Makefile
  • [DH] doc/doxy-wrapper.sh

• FFmpeg 0.6 fails to build on ubuntu 16.04

  18 août 2016, par Andreas Geo

  I am trying to build ffmpeg 0.6 for a project I have. I am using Ubuntu 16.04 and when I try to build it I get the following error :

  In file included from libavcodec/mpegvideo.h:32:0,
  
                from libavcodec/vaapi_internal.h:30,
  
                from libavcodec/vaapi_mpeg4.c:23:
  
  libavcodec/get_bits.h: In function ‘skip_bits’:
  
  libavcodec/get_bits.h:387:17: warning: variable ‘re_cache’ set but not used [-Wunused-but-set-variable]
  
         OPEN_READER(re, s)
  
                     ^ 
  
  libavcodec/get_bits.h:135:13: note: in definition of macro ‘OPEN_READER’
  
       int name##_cache= 0;\
  
           ^
  
  libavcodec/vaapi_mpeg4.c: In function ‘vaapi_mpeg4_start_frame’:
  
  libavcodec/vaapi_mpeg4.c:89:73: error: implicit declaration of function ‘ff_h263_get_gob_height’ [-Werror=implicit-function-declaration]
  
  pic_param->num_macroblocks_in_gob           = s->mb_width * ff_h263_get
  
                                                              ^
  
  cc1: some warnings being treated as errors
  
  common.mak:40: recipe for target 'libavcodec/vaapi_mpeg4.o' failed
  
  make: *** [libavcodec/vaapi_mpeg4.o] Error 1

  I faced a similar error with ffserver.o file but i downloaded these files here and it fixed it :

  sudo apt-get -y install autoconf automake build-essential libass-dev libfreetype6-dev \
  
  libsdl1.2-dev libtheora-dev libtool libva-dev libvdpau-dev libvorbis-dev libxcb1-dev libxcb-shm0-dev \
  
  libxcb-xfixes0-dev pkg-config texinfo zlib1g-dev

  I believe its something similar. Anybody has any ideas ??
  Thank you.

• How to import .pc from a pkgconfig folder using cmake ?

  20 août 2019, par Sailanarmo

  I am currently building FFmpeg as an external project. FFmpeg builds correctly and the library is stuck inside an appropriate lib folder. And inside that lib folder a pkgconfig folder is placed inside with all of the .pc files with the information of all of the associated libraries. Of course, I could be thinking about this wrong. However when I built FFmpeg, I had to use a pkg_congig so it could link with the libraries of x264. Here is my ffmpeg_exteral.cmake file :

  SET_PROPERTY(DIRECTORY PROPERTY "EP_BASE" ${ep_base})
  
  
  
  set( FFmpeg_url "https://github.com/FFmpeg/FFmpeg.git")
  
  set( FFmpeg_TAG "n4.2")
  
  set(FFmpeg_depends "x264_external_download")
  
  
  
  set(PATH_DEPENDS "${x264_LIBRARY_DIR}/pkgconfig")
  
  
  
  ExternalProject_Add(FFmpeg_external_download
  
    DEPENDS ${FFmpeg_depends}
  
    GIT_REPOSITORY ${FFmpeg_url}
  
    GIT_TAG ${FFmpeg_TAG}
  
    UPDATE_COMMAND ""
  
    PATCH_COMMAND ""
  
    INSTALL_COMMAND ""
  
    INSTALL_DIR ""
  
    CONFIGURE_COMMAND PKG_CONFIG_PATH=${PATH_DEPENDS} /configure
  
      --prefix=/build
  
      --enable-static
  
      --extra-cflags=-I${x264_INCLUDE_DIR}\ --static
  
      --extra-ldflags=-L${x264_LIBRARY_DIR}
  
      --enable-gpl
  
      --enable-libx264
  
    BUILD_COMMAND make
  
      -j8
  
  )
  
  
  
  #CACHE PATH "" seems to write the path to a file that I can set 
  
  #library paths to. 
  
  
  
  ExternalProject_Get_Property(FFmpeg_external_download BINARY_DIR)
  
  
  
  set(FFmpeg_LIBRARY_DIR ${BINARY_DIR}/build/lib CACHE INTERNAL "")
  
  set(FFmpeg_INCLUDE_DIR ${BINARY_DIR}/build/include CACHE INTERNAL "")
  
  
  
  add_library(FFmpeg_external STATIC IMPORTED)

  And this links directly with a x264_external.cmake

  SET_PROPERTY(DIRECTORY PROPERTY "EP_BASE" ${ep_base})
  
  
  
  set( x264_url "https://code.videolan.org/videolan/x264.git")
  
  set( x264_TAG "origin/stable")
  
  
  
  
  
  ##[[
  
    The configure command is required because FFMPEG will try to build these 
  
    libraries when x264 static does not need them. 
  
  ]]
  
  ExternalProject_Add(x264_external_download
  
    GIT_REPOSITORY ${x264_url}
  
    GIT_TAG ${x264_TAG}
  
    UPDATE_COMMAND ""
  
    PATCH_COMMAND ""
  
    INSTALL_COMMAND ""
  
    INSTALL_DIR ""
  
    CONFIGURE_COMMAND /configure
  
      --prefix=/x264_build
  
      --enable-static
  
      --disable-opencl 
  
      --disable-avs 
  
      --disable-cli 
  
      --disable-ffms 
  
      --disable-gpac 
  
      --disable-lavf 
  
      --disable-swscale
  
    BUILD_COMMAND make install
  
      -j8
  
  )
  
  
  
  #CACHE PATH "" seems to write the path to a file that I can set 
  
  #library paths to. 
  
  
  
  ExternalProject_Get_Property(x264_external_download BINARY_DIR)
  
  
  
  set(x264_LIBRARY_DIR ${BINARY_DIR}/x264_build/lib CACHE INTERNAL "")
  
  set(x264_BINARY_DIR ${BINARY_DIR}/x264_build/bin CACHE INTERNAL "")
  
  set(x264_INCLUDE_DIR ${BINARY_DIR}/x264_build/include CACHE INTERNAL "")
  
  
  
  add_library(x264_external STATIC IMPORTED)

  As you can see, FFmpeg takes the pkg_config_path from the library directory of x264 and they link together just fine. However, now that I am trying to build a simple example to make sure FFmpeg is linking with my project. I get errors of undefined references to anything from FFmpeg. This is all main.cpp has :

  #include <iostream>
  
  #include <libavcodec></libavcodec>avcodec.h>
  
  #include <libavdevice></libavdevice>avdevice.h>
  
  #include <libavfilter></libavfilter>avfilter.h>
  
  #include <libavformat></libavformat>avformat.h>
  
  #include <libavformat></libavformat>avio.h>
  
  #include <libavutil></libavutil>avutil.h>
  
  
  
  int main()
  
  {
  
    std::cout &lt;&lt; "It compiled." &lt;&lt; std::endl;
  
  
  
    avformat_network_init();
  
  
  
    std::cout &lt;&lt; "It worked." &lt;&lt; std::endl;
  
  
  
    avformat_network_deinit();
  
  
  
  }
  
  </iostream>

  And in the cmake file that uses it, all it has is :

  set(CMAKE_PREFIX_PATH ${FFmpeg_LIBRARY_DIR}/pkgconfig)
  
  
  
  include_directories(${FFmpeg_INCLUDE_DIR})
  
  link_directories(${FFmpeg_LIBRARY_DIR})
  
  
  
  add_executable(Main main.cpp)
  
  
  
  add_dependencies(Main FFmpeg_external_download)

  I read that CMAKE_PREFIX_PATH will find and read in .pc files, however it doesn’t seem to be doing much here, and as far as I can tell, I am not really sure how to set PkgConfig to find a custom path for a package. And maybe this is linking correctly because I am doing this wrong. Any help on how to get these to link together would be tremendous help.

  EDIT : I forgot to say that FFmpeg builds 8 libraries that I am trying to link to in the lib folder. I have tried creating a library for each of them, setting their target properties to their libraries, and linking them to main using target_link_libraries and that hasn’t seemed to work either.

  EDIT 2 : Error message

  CMakeFiles/Main.dir/main.cpp.o: In function `main':
  
  main.cpp:(.text+0x2d): undefined reference to `avformat_network_init()'
  
  main.cpp:(.text+0x5a): undefined reference to `avformat_network_deinit()'
  
  collect2: error: ld returned 1 exit status
  
  Source/CMakeFiles/Main.dir/build.make:91: recipe for target 'bin/Main' failed
  
  make[2]: *** [bin/Main] Error 1
  
  CMakeFiles/Makefile2:242: recipe for target 'Source/CMakeFiles/Main.dir/all' failed
  
  make[1]: *** [Source/CMakeFiles/Main.dir/all] Error 2
  
  Makefile:83: recipe for target 'all' failed
  
  make: *** [all] Error 2

  EDIT 3 : Verbose output

  -L/home/sailanarmo/reeee/Superbuild/Build/FFmpeg_external_download/build/lib -Wl,-rpath,/home/sailanarmo/reeee/Superbuild/Build/FFmpeg_external_download/build/lib -lpthread ../Superbuild/Build/FFmpeg_external_download/build/lib/libavcodec.a ../Superbuild/Build/FFmpeg_external_download/build/lib/libavdevice.a ../Superbuild/Build/FFmpeg_external_download/build/lib/libavfilter.a ../Superbuild/Build/FFmpeg_external_download/build/lib/libavformat.a ../Superbuild/Build/FFmpeg_external_download/build/lib/libavutil.a ../Superbuild/Build/FFmpeg_external_download/build/lib/libpostproc.a ../Superbuild/Build/FFmpeg_external_download/build/lib/libswresample.a ../Superbuild/Build/FFmpeg_external_download/build/lib/libswscale.a