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• Java execute command doesn't work in code

  27 août 2017, par Ariana

  I am calling java.lang.Runtime.exec(...) in my Java program to run a command (some FFMPEG commands) simply passed to my function :

      private static void RunCommand(String command) throws InterruptedException {
  
          try {
  
              // Execute command
  
              Process proc = Runtime.getRuntime().exec(command);
  
  }
  
  }

  It runs OK for simple FFMPEG cases such as ffmpeg -i input.avi -c copy output.avi.

  But for one of the commands, apparently it doesn’t run. When I copy/paste the exact String in command line, I am able to run it and see the output file.

  ffmpeg -i "concat:/home/temp10.avi|/home/p2.avi|/home/temp15.avi" -c copy -y /home/output.avi

  Which is the following in code :

  String c4="ffmpeg -i \"concat:"+dir+temp1+"|"+dir+ad+"|"+dir+temp3+"\" -c copy -y "+dir+output;

  What is going on ? Any guesses why it doesn’t run in code ? If the " is causing the problem, why the corresponding string looks good ?!

• create single video form 3 separate videos using FFmpeg

  24 septembre 2019, par Shijin

  I was trying to create single video form 3 separate videos using FFmpeg.

  ffmpeg -y -loglevel debug  -i /home/ubuntu/test/1569317318/15693173181124138568.webm   -i /home/ubuntu/test/1569317318/1569317318867082351.webm   -i /home/ubuntu/test/1569317318/1569317318191333163.webm  -filter_complex '[0]scale=320:-1[a];[1]scale=320:-1[b];[2]scale=320:-1[c];[3]scale=320:-1[d];[a]pad=640:480[x];[x][b]overlay=320[y];[y][c]overlay=0:240[z];[z][d]overlay=320:240;[0][1]amix'  -c:v libx264   -crf 23   -preset veryfast   -shortest   /home/ubuntu/test/1569317318/1569317318478598265.mp4

  This is not woking, It throws an error like bellow

  Invalid file index 3 in filtergraph description
  [0]scale=320 :-1[a] ;[1]scale=320 :-1[b] ;[2]scale=320 :-1[c] ;[3]scale=320 :-1[d] ;[a]pad=640:480[x] ;[x][b]overlay=320[y] ;[y][c]overlay=0:240[z] ;[z][d]overlay=320:240 ;[0][1]amix.

  How to fix it ? If we provide four inputs, It is working

• compiling ffmpeg from source on debian with dependencies also from source, gives shared library error

  17 mars 2017, par devprashant

  here is a snippet from script(permalink) that is created for compiling and installing ffmpeg from source with compiling its dependencies also from source :

  local_install="$HOME/.localpacks"
  
  mkdir $local_install 2> /dev/null
  
  
  
  
  
  if [[ $PATH != *"$local_install"* ]]; then
  
    echo "Setting PATH to point to" $local_install
  
    echo PATH=$HOME/.localpacks/bin:$HOME/.localpacks/share:$HOME/.localpacks/include:$HOME/.localpacks/lib:$PATH >> ~/.bashrc
  
   # ======see here when pointed below=============================
  
  else
  
    echo "PATH already configured"
  
  fi
  
  
  
  ...................
  
    part of script which download and compile dependencies
  
  ...................
  
  
  
  wget http://ffmpeg.org/releases/ffmpeg-3.2.4.tar.bz2 && \
  
  tar xf ffmpeg-3.2.4.tar.bz2 && \
  
  cd ffmpeg-3.2.4 && \
  
  ./configure   \
  
     --prefix="$local_install" \
  
     --pkg-config-flags="--static"  \
  
     --extra-cflags="-I$HOME/.localpacks/include" \
  
     --extra-ldflags="-L$HOME/.localpacks/lib" \
  
     --bindir="$HOME/.localpacks/bin" \
  
     --enable-gpl \
  
     --enable-libass \ 
  
     --enable-libfreetype  \
  
     --enable-libmp3lame  \
  
     --enable-libx264  \
  
     --enable-nonfree && \
  
  make -j4 && make install && \
  
  cd .. && \
  
  rm ffmpeg-3.2.4* -rf 
  
  
  
  source ~/.profile

  It install ffmpeg correctly. but when i run ffmpeg from terminal it gives :

  ffmpeg : error while loading shared libraries : libass.so.9 : cannot open
  shared object file : No such file or directory

  From upper code snippet , (where you can see now), PATH include $local_install/lib.

  On ls to /.localpacks/lib :

  abc@server:~/.localpacks/lib$ ls
  
  libass.a libass.so.9 libass.la libass.so.9.0.0 libass.so libavcodec.a 

  So, libass.so.9 is in library path.

  To run it correctly , need to run like below :

  $ LD_LIBRARY_PATH=$HOME/.localpacks/lib/:$LD_LIBRARY_PATH
  
  $ LD_LIBRARY_PATH=$local_install/lib ffmpeg

  So, why i need to include it again in LD_LIBRARY_PATH to run ffmpeg.

  Here is the permalink to the script : install_ffmpeg_from_source.sh