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• Java Runtime Command with disrupt/additonal command

  11 juin 2014, par oneofakind

  Actually the example below is not what I want to do, its sort of related to what I really wanna do. Its basically having to execute a shell command or a cmd command and executing another command relating to the first command. Somehow it stops/proceeds/respond to the first command executed.

  It’s actually ffmpeg execution what I wanna do, recording the screen. Problem is that I cannot execute a "q" key to stop the recording. Example above is sort of a simple, but I hope applicable, to my main problem.

  Here is the simplified problem :

  StringBuffer output = new StringBuffer();
  
  String domainName = "google.com";
  
  String command = "ping -t " + domainName;
  
  Process p;
  
  try {
  
      p = Runtime.getRuntime().exec(command);
  
      p.waitFor();
  
      BufferedReader reader = new BufferedReader(new InputStreamReader(p.getInputStream()));
  
  
  
                  String line = "";           
  
      while ((line = reader.readLine())!= null) {
  
          output.append(line + "\n");
  
      }
  
  
  
  } catch (Exception ec) {
  
      ec.printStackTrace();
  
  }
  
  
  
  
  
  System.out.println(output);

  What will happen here is that it will ping endlessly unless interrupted to end the ping, what will happen to the code is that it will get stuck in the line :

   p.waitFor();

  That is because, I believe, it is waiting for the command to finish before it releases it. What I want to do is to execute a "ctrl+C" or command that will stop this execution and then manipulate the result continuing through

   BufferedReader reader = new BufferedReader(new InputStreamReader(p.getInputStream()));
  
   ........
  
   ........

  I hope you guys got what I am trying to say. :D

  Please help. Thanks.

• Extract audio from video in mp3 format using android-ffmpeg-library

  28 mai 2014, par user2870161

  I want extrat audio from any type of video file and save it in mp3 format using android-ffmpeg-library.

  My most of work is done here i am create wav file using this code but problame is when i create mp3 file it make only 0kb file in sdcard.

  I hope I’ve made myself clear, and thanks for taking the time to read this.

      if (inputPath == null || outputPath == null) {
  
          throw new IllegalStateException("Need an input and output filepath!");
  
      }   
  
  
  
      final List<string> cmd = new LinkedList<string>();
  
  
  
  
  
      String baseDir = Environment.getExternalStorageDirectory().getAbsolutePath();
  
      String fileName = "3.mp4";
  
      String fileName1 = "2.mp3";
  
  
  
      String path  = baseDir + "/" + fileName;
  
      String path1  = baseDir + "/" + fileName1;
  
  
  
        File f = new File(path);
  
  
  
        if(f.exists()){
  
            System.out.println("File existed");
  
        }else{
  
            System.out.println("File not found!");
  
        }
  
  
  
        cmd.add(mFfmpegPath);
  
        cmd.add("-i");
  
        cmd.add(path);
  
  
  
        cmd.add("-vn");
  
        cmd.add("-acodec");
  
        cmd.add("copy");
  
  
  
        cmd.add(path1);
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
      final ProcessBuilder pb = new ProcessBuilder(cmd);
  
      return new ProcessRunnable(pb);
  
  </string></string>

• Why ffmpeg C - API Doxygen document using c++ style of namespace for structure

  25 décembre 2018, par Vencat

  I’m new to ffmpeg C-API and learning it from doxygen document in official site. I hope the document explains about ffmpeg C-API, but I have seen some c++ style of class and namespace in it, for example please refer the below document part, where they are using c++ style of namespace for c structure.

  AVClass Struct Reference :

  https://ffmpeg.org/doxygen/trunk/structAVClass.html#details

  can anyone clear this to me.?