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• Compliing OpenCV with FFMPEG failing

  20 mai 2016, par moorej

  I’m trying to install OpenCV 3.1.0 on Ubuntu 14.04 with ffmpeg and python 2.7 support. I’m able to compile with :

  cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local 
  
  -D  INSTALL_C_EXAMPLES=OFF -D INSTALL_PYTHON_EXAMPLES=ON 
  
  -D OPENCV_EXTRA_MODULES_PATH=~/opencv_contrib-3.1.0/modules 
  
  -D WITH_FFMPEG=OFF -D BUILD_EXAMPLES=ON ..

  But -D WITH_FFMPEG=ON fails with the error :

  /usr/bin/ld: /usr/local/lib/libavcodec.a(avpacket.o): 
  
  relocation R_X86_64_32 against `.rodata.str1.1' can not be used when
  
  making a shared object; recompile with -fPIC
  
  /usr/local/lib/libavcodec.a: error adding symbols: Bad value
  
  collect2: error: ld returned 1 exit status

  I’m compiling ffmpeg as well and I’ve looked at a number of posts relating to the problem and attempted to add —enable-pic and —enable-shared along with some other options but I have to admit I’m a bit stupid when it comes to anything compilation related. My process for compiling ffmpeg is below. Please help me with my mess. Thanks !

  mkdir ~/ffmpeg_sources
  
  
  
  #libx264
  
  cd ~/ffmpeg_sources
  
  wget http://download.videolan.org/pub/x264/snapshots/last_x264.tar.bz2
  
  tar xjvf last_x264.tar.bz2
  
  cd x264-snapshot*
  
  PATH="$HOME/bin:$PATH" ./configure --prefix="$HOME/ffmpeg_build" --bindir="$HOME/bin" --enable-static --enable-shared --enable-pic
  
  PATH="$HOME/bin:$PATH" make -j4
  
  make install
  
  make distclean
  
  
  
  #libfdk-aac
  
  cd ~/ffmpeg_sources
  
  wget -O fdk-aac.tar.gz https://github.com/mstorsjo/fdk-aac/tarball/master
  
  tar xzvf fdk-aac.tar.gz
  
  cd mstorsjo-fdk-aac*
  
  autoreconf -fiv
  
  ./configure --prefix="$HOME/ffmpeg_build" --enable-shared --enable-pic
  
  make -j4
  
  make install
  
  make distclean
  
  
  
  #libmp3lame
  
  sudo apt-get install nasm
  
  cd ~/ffmpeg_sources
  
  wget http://downloads.sourceforge.net/project/lame/lame/3.99/lame-3.99.5.tar.gz
  
  tar xzvf lame-3.99.5.tar.gz
  
  cd lame-3.99.5
  
  ./configure --prefix="$HOME/ffmpeg_build" --enable-nasm --enable-shared --enable-pic
  
  make -j4
  
  make install
  
  make distclean
  
  
  
  #libopus
  
  cd ~/ffmpeg_sources
  
  wget http://downloads.xiph.org/releases/opus/opus-1.1.tar.gz
  
  tar xzvf opus-1.1.tar.gz
  
  cd opus-1.1
  
  ./configure --prefix="$HOME/ffmpeg_build" --enable-shared --enable-pic
  
  make -j4
  
  make install
  
  make clean
  
  
  
  #libvpx
  
  cd ~/ffmpeg_sources
  
  wget http://storage.googleapis.com/downloads.webmproject.org/releases/webm/libvpx-1.5.0.tar.bz2
  
  tar xjvf libvpx-1.5.0.tar.bz2
  
  cd libvpx-1.5.0
  
  PATH="$HOME/bin:$PATH" ./configure --prefix="$HOME/ffmpeg_build" --disable-examples --disable-unit-tests --enable-shared --enable-pic
  
  PATH="$HOME/bin:$PATH" make -j4
  
  make install
  
  make clean
  
  
  
  #ffmpeg
  
  cd ~/ffmpeg_sources
  
  wget http://ffmpeg.org/releases/ffmpeg-snapshot.tar.bz2
  
  tar xjvf ffmpeg-snapshot.tar.bz2
  
  cd ffmpeg
  
  PATH="$HOME/bin:$PATH" PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig" ./configure 
  
    --prefix="$HOME/ffmpeg_build"
  
    --pkg-config-flags="--static"
  
    --extra-cflags="-I$HOME/ffmpeg_build/include"
  
    --extra-cflags="-fPIC -m64 -I$HOME/ffmpeg_build/include"
  
    --extra-ldflags="-L$HOME/ffmpeg_build/lib"
  
    --bindir="$HOME/bin"
  
    --enable-pic 
  
    --enable-shared 
  
    --enable-gpl 
  
    --enable-libass 
  
    --enable-libfdk-aac 
  
    --enable-libfreetype 
  
    --enable-libmp3lame 
  
    --enable-libopus 
  
    --enable-libtheora 
  
    --enable-libvorbis 
  
    --enable-libvpx 
  
    --enable-libx264 
  
    --enable-nonfree
  
  PATH="$HOME/bin:$PATH" make -j4
  
  make install
  
  make distclean
  
  hash -r

• Compilation of ffmpeg results in error in stdlib.h

  5 octobre 2015, par goldenmean

  I am cross-compiling ffmpeg source to a mips-openwrt target using a toolchain I have built for this platform(MIPS openwrt).

  Then ffmpeg make is giving below errors in uclibc header file stdlib.h as below :

  In file included from ./libavutil/avassert.h:30:0,
  
                   from libavfilter/avfilter.c:23:
  
  /home/staging_dir/toolchain-mips_r2_gcc-4.6-linaro_uClibc-0.9.33.2/lib/gcc/mips-openwrt-linux-uclibc/4.6.3/../../../../mips-openwrt-linux-uclibc/sys-include/stdlib.h:546:14: error: expected identifier or '(' before 'void'
  
  /home/staging_dir/toolchain-mips_r2_gcc-4.6-linaro_uClibc-0.9.33.2/lib/gcc/mips-openwrt-linux-uclibc/4.6.3/../../../../mips-openwrt-linux-uclibc/sys-include/stdlib.h:546:14: error: expected ')' before numeric constant

  The code from the uclibc stdlib.h around that line number is

      #ifdef __USE_ISOC99
  
      __BEGIN_NAMESPACE_C99
  
      /* Terminate the program with STATUS without calling any of the
  
         functions registered with `atexit' or `on_exit'.  */
  
      extern void _Exit (int __status) __THROW __attribute__ ((__noreturn__));
  
      __END_NAMESPACE_C99
  
      #endif
  
  
  
     __BEGIN_NAMESPACE_STD
  
     /* Return the value of envariable NAME, or NULL if it doesn't exist.  */
  
     extern char *getenv (__const char *__name) __THROW __nonnull ((1)) __wur; << This is the line where the compilation error is
  
     __END_NAMESPACE_STD

  Any pointers to resovle this would be helpful.

• FFMPEG - Verify frame order

  27 octobre 2015, par RockJake28

  I have created a video of a large number of images using ffmpeg using the following command

  ffmpeg -framerate 25 -pattern_type glob -i "*.png" -c:v libx264 -pix_fmt yuv420p /home/jake/Desktop/output.mp4

  The command works and produces a video, however I need a way to verify that the images have been processed in the correct order as the files have quite obscure names. For example, the first 3 images in the sequence are :

  1. image_20150625T100000.000_550000328.png
  2. image_20150625T100000.033_550330578.png
  3. image_20150625T100000.067_550671379.png

  all the way up to

  image_20150625T100459.987_3546673942.png

  I have tried using the -loglevel switch on various different options in hope that one would output the file name of each frame processed, but none seem to do that.

  Thanks in advance.