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• Executing process on cmd, does not process

  2 août 2012, par Z Jackobovski

  I am running ffmpeg from Java. Using it to convert flv files to mp3.

  When I run the code below, ffmpeg starts, creates a new file (the .mp3 one) but runs at 0% of CPU. When I stop the JAVA app (from netbeans) ffmpeg remains open and goes from 0% to 99% per Windows task manager (CTRL-ALT-DEL). Another weird thing is going on. The output from ffmpeg is not being printed.

  The thread is starting but for some reason java is not giving it any time to do its processing.

  Any suggestions on how to fix this ? Thanks.

  public class ConverterThread extends Thread {
  
  
  
   String fileToConvert;
  
   String fileToCreate;
  
   GetSong getSong;
  
  
  
  
  
  
  
  public ConverterThread(String downloadLocationOnDisk, GetSong getSong) {
  
     this.fileToConvert = downloadLocationOnDisk;
  
     this.getSong = getSong;
  
  }
  
  
  
  
  
  public void run(){
  
      try {
  
          Thread cur=Thread.currentThread();
  
          cur.setPriority(Thread.MAX_PRIORITY);
  
  
  
             String downloadLocationOnDisk = fileToConvert;
  
  
  
              if(downloadLocationOnDisk.contains(".flv"))
  
                  fileToCreate = downloadLocationOnDisk.replace(".flv", ".mp3");
  
  
  
              if(downloadLocationOnDisk.contains(".m4a"))
  
                  fileToCreate = downloadLocationOnDisk.replace(".m4a", ".mp3");
  
  
  
  
  
  
  
              String cmdLine =  "ffmpeg/bin/ffmpeg -i \"" + fileToConvert + "\" \"" + fileToCreate +"\""; 
  
  
  
              System.err.println(cmdLine);
  
  
  
               // run the Unix "ps -ef" command
  
               // using the Runtime exec method:
  
               Process p = Runtime.getRuntime().exec(cmdLine);
  
  
  
  
  
               BufferedReader stdInput = new BufferedReader(new 
  
                    InputStreamReader(p.getInputStream()));
  
  
  
               BufferedReader stdError = new BufferedReader(new 
  
                    InputStreamReader(p.getErrorStream()));
  
  
  
               String s;
  
  
  
               // read the output from the command
  
               while ((s = stdInput.readLine()) != null) {
  
                   System.out.println(s);
  
               }
  
  
  
               // read any errors from the attempted command
  
               System.out.println("Here is the standard error of the command (if any):\n");
  
               while ((s = stdError.readLine()) != null) {
  
                   System.out.println(s);
  
               }
  
  
  
      } catch (IOException ex) {
  
          Logger.getLogger(ConverterThread.class.getName()).log(Level.SEVERE, null, ex);
  
      }

• ffmpeg.exe freezes

  17 mars 2015, par Ayhan Dorman

  I’m using Asp.Net C# Framework 4 and currently developing a video conversion application. I’m also using ffmpeg to convert from all uploaded formats to flv. I’m first converting uploaded file to mpg and after to flv due to problems I encountered while trying conversion directly to flv from mp4 sometimes. But ffmpeg freezes as soon as it’s done with conversion process to mpg file. When I run task manager and check the processes list, it just stands there using no CPU resource. When I end the ffmpeg process directly from task manager, other process take place which converts from mpg to flv and preview file (jpg) and works smoothly. Due to freezing of first process, the second process cannot start when I try to upload from my web page’s file upload form. I appreciate any response from now. Here is my code :

          string duration = "00:00:00";
  
  
  
          //converting video
  
          Process ffmpeg;
  
          ffmpeg = new Process();
  
  
  
          // convert to mpg 1st
  
          ffmpeg.StartInfo.Arguments = " -i \"" + Server.MapPath("static/user/vid/") + videolink + "\" -f mpeg -b 300k -ac 2 -ab 128k -ar 44K \"" + Server.MapPath("static/user/vid/") + mpglink + "\"";
  
          ffmpeg.StartInfo.FileName = Page.MapPath("bin/ffmpeg.exe");
  
          ffmpeg.StartInfo.CreateNoWindow = true;
  
          ffmpeg.StartInfo.UseShellExecute = false;
  
          ffmpeg.StartInfo.RedirectStandardOutput = true;
  
          ffmpeg.StartInfo.RedirectStandardError = true;
  
          ffmpeg.Start();
  
  
  
          ffmpeg.WaitForExit();
  
          ffmpeg.Close();
  
  
  
  
  
          // mpg 2 flv
  
          ffmpeg = new Process();
  
          ffmpeg.StartInfo.Arguments = " -i \"" + Server.MapPath("static/user/vid/") + mpglink + "\" -f flv -s 624x352 \"" + Server.MapPath("static/user/vid/") + flvlink + "\"";
  
          ffmpeg.StartInfo.FileName = Page.MapPath("bin/ffmpeg.exe");
  
          ffmpeg.StartInfo.CreateNoWindow = true;
  
          ffmpeg.StartInfo.UseShellExecute = false;
  
          ffmpeg.StartInfo.RedirectStandardOutput = true;
  
          ffmpeg.StartInfo.RedirectStandardError = true;
  
          ffmpeg.Start();
  
  
  
          ffmpeg.BeginOutputReadLine();
  
          string error = ffmpeg.StandardError.ReadToEnd();
  
          ffmpeg.WaitForExit();
  
  
  
          try
  
          {
  
              duration = error.Substring(error.IndexOf("Duration: ") + 10, 8);
  
          }
  
          catch
  
          {
  
          }
  
  
  
          if (ffmpeg.ExitCode != 0)
  
          {
  
              ltrUpload.Text = "<div class="\&quot;resultbox-negative\&quot;">Problem occured during upload process. Error code: " + error + "<br />" + "</div>";
  
              return;
  
          }
  
          ffmpeg.Close();
  
  
  
  
  
          // generate preview image
  
          ffmpeg.StartInfo.Arguments = " -i \"" + Server.MapPath("static/user/vid/") + flvlink + "\" -s 624x352 -ss 00:00:03 -an -vframes 1 -f image2 -vcodec mjpeg \"" + Server.MapPath("static/user/vid/") + flvlink.Replace(".flv", ".jpg") + "\"";
  
          ffmpeg.StartInfo.FileName = Page.MapPath("bin/ffmpeg.exe");
  
          ffmpeg.StartInfo.CreateNoWindow = true;
  
          ffmpeg.StartInfo.UseShellExecute = false;
  
          ffmpeg.StartInfo.RedirectStandardOutput = true;
  
          ffmpeg.StartInfo.RedirectStandardError = true;
  
          ffmpeg.Start();
  
          ffmpeg.WaitForExit();
  
          ffmpeg.Close();
  
  
  
          // deleting original file and mpg
  
          FileInfo fi = new FileInfo(Server.MapPath("static/user/vid/") + videolink);
  
          if (fi.Exists) fi.Delete();
  
          fi = new FileInfo(Server.MapPath("static/user/vid/") + mpglink);
  
          if (fi.Exists) fi.Delete();

• What happens when I use too much RAM from spawning process with Popen in Python ? [closed]

  2 février 2020, par lms702

  I have a Python script that is rendering a video with FFmpeg where I have all the images and audio I need. I am currently invoking FFmpeg via multiprocessing.Popen, which works very quickly on my computer but the Task Manager shows that I am using 12 GB of RAM while doing so (since there end up being 100s of instances of FFmpeg.exe running). I want to deploy this on a linux server one day with much less RAM, but I worry that I’ll run into problems with my approach. Does Python/the OS handle this or should I limit the number of processes I spawn myself ?