Programming and Technology

Para instalar OpenCV 2.4.2 con soporte ffmpeg tenemos que instalar primero lamemp3, faac, faad y por supuesto ffmpeg. He añadido un nuevo script en mi repositorio installation-scripts de Github pero voy a poner de todas formas aquí como se instala cada librería paso a paso.

Recuerda también que para poder compilar desde la linéa de comandos con Xcode 4.4 hay que instalar antes las “Command Line Tools”. Echa un vistazo a “No puedo configurar con cmake en Mac OS X 10.8 con Xcode 4.4” antes de continuar con la instalación.

mp3lame:

curl -L -o lame-3.99.5.tar.gz http://sourceforge.net/projects/lame/files/lame/3.99/lame-3.99.5.tar.gz/download
tar xzvf lame-3.99.5.tar.gz
cd lame-3.99.5
./configure --disable-dependency-tracking CFLAGS="-arch i386 -arch x86_64" LDFLAGS="-arch i386 -arch x86_64"
make
sudo make install
cd ..

faac (observar que solo se compila para for x86_64):

curl -L -o faac-1.28.tar.gz http://sourceforge.net/projects/faac/files/faac-src/faac-1.28/faac-1.28.tar.gz/download
tar xzvf faac-1.28.tar.gz
cd faac-1.28
./configure --disable-dependency-tracking CFLAGS="-arch x86_64" LDFLAGS="-arch x86_64"
make
sudo make install
cd ..

faad:

curl -L -o faad2-2.7.tar.gz http://sourceforge.net/projects/faac/files/faad2-src/faad2-2.7/faad2-2.7.tar.gz/download
tar xvzf faad2-2.7.tar.gz
cd faad2-2.7
./configure --disable-dependency-tracking CFLAGS="-arch i386 -arch x86_64" LDFLAGS="-arch i386 -arch x86_64"
make
sudo make install
cd ..

ffmpeg:

curl -O http://ffmpeg.org/releases/ffmpeg-0.11.1.tar.gz
tar xzvf ffmpeg-0.11.1.tar.gz
cd ffmpeg-0.11.1
./configure --enable-libmp3lame --enable-libfaac --enable-nonfree --enable-shared --enable-pic --disable-mmx --arch=x86_64
make
sudo make install
cd ..

OpenCV 2.4.2:

curl -L -o OpenCV-2.4.2.tar.bz2 http://sourceforge.net/projects/opencvlibrary/files/opencv-unix/2.4.2/OpenCV-2.4.2.tar.bz2/download
tar xvzf OpenCV-2.4.2.tar.bz2
cd OpenCV-2.4.2

Si configuramos y compilamos OpenCV 2.4.2 tal cual nos aparecerá un error de linkado más o menos al 34% del proceso de compilación de esta manera:

Linking CXX shared library ../../lib/libopencv_highgui.dylib
Undefined symbols for architecture x86_64:
  "_faacEncClose", referenced from:
      _Faac_encode_close in libavcodec.a(libfaac.o)
      _Faac_encode_init in libavcodec.a(libfaac.o)
  "_faacEncEncode", referenced from:
      _Faac_encode_frame in libavcodec.a(libfaac.o)
  "_faacEncGetCurrentConfiguration", referenced from:
      _Faac_encode_init in libavcodec.a(libfaac.o)
  "_faacEncGetDecoderSpecificInfo", referenced from:
      _Faac_encode_init in libavcodec.a(libfaac.o)
  "_faacEncOpen", referenced from:
      _Faac_encode_init in libavcodec.a(libfaac.o)
  "_faacEncSetConfiguration", referenced from:
      _Faac_encode_init in libavcodec.a(libfaac.o)
  "_lame_close", referenced from:
      _mp3lame_encode_close in libavcodec.a(libmp3lame.o)
      _mp3lame_encode_init in libavcodec.a(libmp3lame.o)
  "_lame_encode_buffer", referenced from:
      _mp3lame_encode_frame in libavcodec.a(libmp3lame.o)
  "_lame_encode_buffer_float", referenced from:
      _mp3lame_encode_frame in libavcodec.a(libmp3lame.o)
  "_lame_encode_buffer_int", referenced from:
      _mp3lame_encode_frame in libavcodec.a(libmp3lame.o)
  "_lame_encode_buffer_interleaved", referenced from:
      _mp3lame_encode_frame in libavcodec.a(libmp3lame.o)
  "_lame_encode_flush", referenced from:
      _mp3lame_encode_frame in libavcodec.a(libmp3lame.o)
  "_lame_get_encoder_delay", referenced from:
      _mp3lame_encode_init in libavcodec.a(libmp3lame.o)
  "_lame_get_framesize", referenced from:
      _mp3lame_encode_init in libavcodec.a(libmp3lame.o)
  "_lame_init", referenced from:
      _mp3lame_encode_init in libavcodec.a(libmp3lame.o)
  "_lame_init_params", referenced from:
      _mp3lame_encode_init in libavcodec.a(libmp3lame.o)
  "_lame_set_VBR", referenced from:
      _mp3lame_encode_init in libavcodec.a(libmp3lame.o)
  "_lame_set_VBR_quality", referenced from:
      _mp3lame_encode_init in libavcodec.a(libmp3lame.o)
  "_lame_set_bWriteVbrTag", referenced from:
      _mp3lame_encode_init in libavcodec.a(libmp3lame.o)
  "_lame_set_brate", referenced from:
      _mp3lame_encode_init in libavcodec.a(libmp3lame.o)
  "_lame_set_disable_reservoir", referenced from:
      _mp3lame_encode_init in libavcodec.a(libmp3lame.o)
  "_lame_set_in_samplerate", referenced from:
      _mp3lame_encode_init in libavcodec.a(libmp3lame.o)
  "_lame_set_mode", referenced from:
      _mp3lame_encode_init in libavcodec.a(libmp3lame.o)
  "_lame_set_num_channels", referenced from:
      _mp3lame_encode_init in libavcodec.a(libmp3lame.o)
  "_lame_set_out_samplerate", referenced from:
      _mp3lame_encode_init in libavcodec.a(libmp3lame.o)
  "_lame_set_quality", referenced from:
      _mp3lame_encode_init in libavcodec.a(libmp3lame.o)
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[2]: *** [lib/libopencv_highgui.2.4.2.dylib] Error 1
make[1]: *** [modules/highgui/CMakeFiles/opencv_highgui.dir/all] Error 2
make: *** [all] Error 2

Para resolver este problema tenemos que modificar el fichero modules/highgui/CMakeLists.txt y añadir lo siguiente justo antes de if(HAVE_FFMPEG) (en la línea 158):

if(APPLE)
  list(APPEND HIGHGUI_LIBRARIES ${BZIP2_LIBRARIES} -lmp3lame -lfaac -lbz2)
endif(APPLE)

O podemos aplicar el siguiente parche a OpenCV 2.4.2:

--- modules/highgui/CMakeLists.txt.old     2012-06-19 19:17:35.000000000 +0200
+++ modules/highgui/CMakeLists.txt      2012-06-19 22:48:58.000000000 +0200
@@ -145,6 +145,10 @@
   list(APPEND HIGHGUI_LIBRARIES m3api)
 endif(HAVE_XIMEA)
 
+if(APPLE)
+  list(APPEND HIGHGUI_LIBRARIES ${BZIP2_LIBRARIES} -lmp3lame -lfaac -lbz2)
+endif(APPLE)
+
 if(HAVE_FFMPEG)
   if(UNIX AND BZIP2_LIBRARIES)
     list(APPEND HIGHGUI_LIBRARIES ${BZIP2_LIBRARIES})

Ahora ya podemos configurar, compilar e instalar OpenCV como siempre. Si quieres saber más acerca de los parámetros de configuración de cmake para OpenCV puedes echar un vistazo a “Instalar OpenCV 2.3.1a en Mac OS X 10.6“.

mkdir build
cmake ..
make
sudo make install
cd ..

Fuente: http://blog.yageek.net/2012/06/compile-opencv-241-on-mac-os-x-lion.html