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• Pass a process to a subclass

  16 décembre 2014, par Brett

  I would like to pass a process to a subclass so I may kill it but I can’t figure out how to pass the process. I’m unsure how to store it so I can return it to the form and be able to call the subclass method to kill it. here are my classes

  package my.mashformcnts;
  
  import java.io.IOException;
  
  import java.util.Scanner;
  
  import java.util.regex.Pattern;
  
  
  
  
  
  /**
  
   *
  
   * @author brett
  
   */
  
  public class MashRocks {
  
  
  
      public static Process startThread(MashFormCnts mashFormCnts) throws IOException {
  
          ProcessBuilder pb = new ProcessBuilder("ffmpeg", "-i", "C:\\Users\\brett\\Documents\\Telegraph_Road.mp4", "C:\\Users\\brett\\Documents\\out.mp4");
  
  
  
          //Here is where i would like to name and store the Process
  
  
  
  
  
          final Process p = pb.start();
  
          // create a new thread to get progress from ffmpeg command , override  
  
          // it's run method, and start it!  
  
          Thread t = new Thread() {
  
              @Override
  
              public void run() {
  
                  Scanner sc = new Scanner(p.getErrorStream());
  
                  // Find duration  
  
                  Pattern durPattern = Pattern.compile("(?<=Duration: )[^,]*");
  
                  String dur = sc.findWithinHorizon(durPattern, 0);
  
                  if (dur == null) {
  
                      throw new RuntimeException("Could not parse duration.");
  
                  }
  
                  String[] hms = dur.split(":");
  
                  double totalSecs = Integer.parseInt(hms[0]) * 3600 + Integer.parseInt(hms[1]) * 60 + Double.parseDouble(hms[2]);
  
                  System.out.println("Total duration: " + totalSecs + " seconds.");
  
                  // Find time as long as possible.  
  
                  Pattern timePattern = Pattern.compile("(?<=time=)[\\d:.]*");
  
                  String match;
  
                  String[] matchSplit;
  
                  //MashForm pgbar = new MashForm();
  
                  while (null != (match = sc.findWithinHorizon(timePattern, 0))) {
  
                      matchSplit = match.split(":");
  
                      double progress = (Integer.parseInt(matchSplit[0]) * 3600 + Integer.parseInt(matchSplit[1]) * 60 + Double.parseDouble(matchSplit[2])) / totalSecs;
  
                      int prog = (int) (progress * 100);
  
                      mashFormCunts.setbar(prog);
  
                  }
  
              }
  
          };
  
         t.start();
  
         return p;
  
      }
  
     public synchronized static void stop(Thread t) throws IOException{
  
             Runtime.getRuntime().exec("taskkill /F /IM ffmpeg.exe");  
  
              t = null;
  
            //t.interrupt();
  
  
  
  
  
  
  
     }
  
  }
  
     class killMash extends MashRocks{
  
      public static void Kfpeg(Process p){
  
  
  
        p.destroyForcibly();
  
      }
  
  }

  So those are my classes. I’m very new.

  Next there is the event Listener on the form, so when I click this I want to kill the ffmpeg proecess with the Thread t :

    private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {                                         
  
          // TODO add your handling code here:
  
          Thread n = Thread.currentThread();
  
          System.out.print(n);
  
          try {
  
              //MashRocks.stop(n);
  
               //This isnt working but i think its closer
  
               killMash.Kfpeg(MashRocks.startThread(this)); 
  
  //Not Sure what to do here
  
    //here is where i want to pass the process sorry for the typo
  
    killMash.kfpeg(p); 
  
              } catch (IOException ex) {
  
                  Logger.getLogger(MashFormCunts.class.getName()).log(Level.SEVERE, null, ex);
  
              }
  
  
  
          }   

  Any help is awesome cheers

• A Better Process Runner

  1er janvier 2011, par Multimedia Mike — Python

  I was recently processing a huge corpus of data. It went like this : For each file in a large set, run 'cmdline-tool <file>', capture the output and log results to a database, including whether the tool crashed. I wrote it in Python. I have done this exact type of the thing enough times in Python that I’m starting to notice a pattern.

  Every time I start writing such a program, I always begin with using Python’s commands module because it’s the easiest thing to do. Then I always have to abandon the module when I remember the hard way that whatever ’cmdline-tool’ is, it might run errant and try to execute forever. That’s when I import (rather, copy over) my process runner from FATE, the one that is able to kill a process after it has been running too long. I have used this module enough times that I wonder if I should spin it off into a new Python module.

  Or maybe I’m going about this the wrong way. Perhaps when the data set reaches a certain size, I’m really supposed to throw it on some kind of distributed cluster rather than task it to a Python script (a multithreaded one, to be sure, but one that runs on a single machine). Running the job on a distributed architecture wouldn’t obviate the need for such early termination. But hopefully, such architectures already have that functionality built in. It’s something to research in the new year.

  I guess there are also process limits, enforced by the shell. I don’t think I have ever gotten those to work correctly, though.

• Emulate an IP Camera

  23 décembre 2013, par Goro

  I am using software (DVR) that is meant to talk directly to an IP camera. I am trying to pass a h264 stream directly into it, but it does not work if I just throw a stream onto it.

  Can you recommend any "spoofing" software to emulate an IP camera ? For the sake of argument, we can say that the camera we want to emulate is Axis P3301.

  Given that a lot of software out there can talk to IP cameras, is there a way to use something like vlc/ffmpeg to look like its an IP camera ?

  Thanks.