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• Audio not working in ffmpeg video conversion

  10 mars 2016, par Vishnu

  I am adding extra blank 1hour to my existing video using bellow command

  echo shell_exec('/usr/local/bin/ffmpeg -y -i universal.mp4 -f lavfi -i "color=black:s=1280x720:r=24:d=5400" -filter_complex "[0][1]concat=n=2:v=1:a=0[v]" -map [v] -c:v libx264 output.mp4  2>&1');

  But out.mp4 is produced without any audio.Some one please guide me.

• Compile FFmpeg with libfdk_aac

  26 mars 2024, par Toydor

  I been reading on how to convert mp3 to m4a, and found that I must compile FFmpeg if I'll use the AAC encoder, libfdk_aac.

  



  But reading FFmpeg guide on how to compile FFmpeg with libfdk_aac makes no sense for a beginner like me.

  



  To use libfdk_aac the encoding guide says :

  



  


  Requires ffmpeg to be configured with —enable-libfdk_aac
 —enable-nonfree.

  


  



  Where do I put those flags ?

  



  Do I put it here somewhere ? :

  



  cd ~/ffmpeg_sources
git clone --depth 1 git://github.com/mstorsjo/fdk-aac.git
cd fdk-aac
autoreconf -fiv
./configure --prefix="$HOME/ffmpeg_build" --disable-shared
make
make install
make distclean


  



  Or maybe here somewhere ?

  



  cd ~/ffmpeg_sources
git clone --depth 1 git://source.ffmpeg.org/ffmpeg
cd ffmpeg
PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig"
export PKG_CONFIG_PATH
./configure --prefix="$HOME/ffmpeg_build" \
  --extra-cflags="-I$HOME/ffmpeg_build/include" --extra-ldflags="-L$HOME/ffmpeg_build/lib" \
  --bindir="$HOME/bin" --extra-libs="-ldl" --enable-gpl --enable-libass --enable-libfdk-aac \
  --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx \
  --enable-libx264 --enable-nonfree --enable-x11grab
make
make install
make distclean
hash -r


  



  If I'm reading the compile guide right I guess that these two chunks of code is what I need to compile FFmpeg.

  



  I'm using Ubuntu server 12.4

  



  UPDATE

  



  After upgrading my system to Ubuntu 16.04 I had to install ffmpeg again. 
I still needed libfdk-aac. Fortunately there's a good step-by-step guide at http://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu on how to compile ffmpeg.

  



  I thought I would share how to compile if just interested in compiling ffmpeg with libfdk-aac and libmp3lame.

  



  If you haven't already a bin in home directory :

  



  mkdir ~/bin 


  



  Install dependencies. Didn't need the non-server packages :

  



  sudo apt-get update
sudo apt-get -y install autoconf automake build-essential libass-dev libfreetype6-dev libtheora-dev libtool libvorbis-dev pkg-config texinfo zlib1g-dev 


  



  Then install the encoders. Had to install yasm as well, otherwise I got errors when compiling.

  



  sudo apt-get install libfdk-aac-dev
sudo apt-get install libmp3lame-dev
sudo apt-get install yasm


  



  Then compile ffmpeg with needed flags

  



  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="$HOME/bin" \
--enable-libass \
--enable-libfdk-aac \
--enable-libfreetype \
--enable-libtheora \
--enable-libvorbis \
--enable-libmp3lame \
--enable-nonfree \
--enable-gpl
PATH="$HOME/bin:$PATH" make
make install
make distclean
hash -r


  


• How to build opencv_ffmpeg.so for Linux/MacOS

  27 octobre 2016, par Black

  How to build opencv_ffmpeg.so like opencv_ffmpeg.dll in Windows for OpenCV use in java app.
  I followed build guide of FFmpeg.org but when build completed, it just generated many lib*.so.
  How to build opencv_ffmpeg.so for shipping in my java application and load it dynamically when app runs ?