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• Building ffmpeg example, trouble linking

  16 octobre 2022, par Expressingx

  I want to debug ffmpeg example, transcoding

  


  I've followed the compilation guide for ubuntu and everything is fine. Now I want to do some changes (e.g. opening actual camera) and had to add avdevice_register_all() function. Because of that now I cannot build it. The command for building is

  


  /usr/bin/gcc -fdiagnostics-color=always -g /home/myuser/ffmpeg_sources/ffmpeg/doc/examples/transcoding.c -L/home/myuser/ffmpeg_build/lib -I/home/myuser/ffmpeg_build/include -o /home/myuser/ffmpeg_sources/ffmpeg/doc/examples/transcoding -lX11 -lXext -lxcb-shm -lavdevice -lavformat -lavfilter -lavcodec -lswresample -lswscale -lavutil -lm -lx264 -lgnutls -lfdk-aac -lvdpau -lva -lz -lpostproc -lva-x11 -lva-drm -lxcb -lxcb-shape -lxcb-xfixes -lxcb-render -lasound -lsndio -lSDL2 -ldl -lbz2


  


  but I get one error

  


  /usr/bin/ld: /home/myuser/ffmpeg_build/lib/libavdevice.a(xv.o): undefined reference to symbol 'XGetWindowAttributes'
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/12/../../../x86_64-linux-gnu/libX11.so: error adding symbols: DSO missing from command line


  


  What am I missing ?

  


• How to recompile ffmpeg in Ubuntu

  26 avril 2017, par David Page

  I installed ffmpeg in Ubuntu but in a wrong way—I compiled it with only —enable-libass. And now I can not use -crf option so I want to recompile it.

  According to this page I typed these command :

  rm -rf ~/ffmpeg_build ~/ffmpeg_sources~/bin/{ffmpeg,ffprobe,ffplay,ffserver,vsyasm,x264,x265,yasm,ytasm}

  then I started compile again :

  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-ldflags="-L$HOME/ffmpeg_build/lib" \
  
    --bindir="$HOME/bin" \
  
    --enable-gpl \
  
    --enable-libass \
  
    --enable-libfdk-aac \
  
    --enable-libfreetype \
  
    --enable-libmp3lame \
  
    --enable-libopus \
  
    --enable-libtheora \
  
    --enable-libvorbis \
  
    --enable-libvpx \
  
    --enable-libx264 \
  
    --enable-libx265 \
  
    --enable-nonfree
  
  PATH="$HOME/bin:$PATH" make
  
  make install
  
  make distclean
  
  hash -r

  But when I type ffmpeg it still output :

  ffmpeg version N-77474-g11388b5 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04)
  
    configuration: --enable-libass
  
    libavutil      55. 11.100 / 55. 11.100
  
    libavcodec     57. 20.100 / 57. 20.100
  
    libavformat    57. 20.100 / 57. 20.100
  
    libavdevice    57.  0.100 / 57.  0.100
  
    libavfilter     6. 22.100 /  6. 22.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.101 /  2.  0.101

  I am puzzled and how to recompile or remove ffmpeg in a right way ?

• join audio file in specific time of the video ffmpeg

  25 novembre 2012, par George L.

  i am trying to use the code bellow to merge an audio file at specific time (6th second of my input video) and create a new video autput file but i cant make it work.

  <?php
  
  
  
  exec("/usr/local/bin/ffmpeg -sameq -i /home/xxx/public_html/xxx/video/full.mp4 -itsoffet 6 -i /home/xxx/public_html/xxx/sounds/names/george.mp3 /home/xxx/public_html/xxx/upload/sample.mpg");
  
  
  
  
  
  ?>

  Thank you a lot !