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• ffmpg android command gives error

  14 décembre 2015, par Mubina Shaikh

  I am overlaying gif on video in android and using ffmpg wrapper
  my command is

          String vidpath=Environment.getExternalStorageDirectory()+"/WhatsApp/Media/WhatsApp Video/vid.mp4";
  
          String gifpath=Environment.getExternalStorageDirectory()+"/WhatsApp/Media/WhatsApp Video/vid.gif";
  
          String outpath=Environment.getExternalStorageDirectory()+"/out.mp4";
  
           ffmpeg.execProcess(new String[]{
  
              ffmpegBin,
  
              "-i",
  
              vidpath,
  
              "-i",
  
              gifpath,
  
              "-filter_complex",
  
              "\"overlay=x=(main_w-overlay_w)/2:y=(main_h-overlay_h)/2\"",
  
              //"640x388",
  
              out_video_path
  
  
  
  
  
  
  
  
  
          },sc);

  my execProcess method is

   public void execProcess( String[] cmds, ShellCallback sc) throws Exception {        
  
  
  
  
  
          ProcessBuilder pb = new ProcessBuilder(cmds);
  
          pb.redirectErrorStream(true);
  
          Process process = pb.start();      
  
  
  
          BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
  
  
  
          String line;
  
  
  
  
  
          /*switch(command_call_type)
  
          {
  
          case Keys.KEY_COMMANDEXE_TYPE_MERGEFRAME:
  
  
  
          //  refincereference.updateLoadingbar(30);
  
              break;
  
  
  
          }*/
  
  
  
          while ((line = reader.readLine()) != null)
  
          {
  
              if (sc != null)
  
              {
  
                  sc.shellOut(line.toCharArray());
  
  
  
              Log.e("FFMPEG", line.toCharArray()+"");
  
  
  
  
  
              }
  
          }
  
  
  
  
  
  
  
          /*switch(command_call_type)
  
          {
  
          case Keys.KEY_COMMANDEXE_TYPE_MERGEFRAME:
  
  
  
              //refincereference.updateLoadingbar(40);
  
              break;
  
  
  
          case Keys.KEY_COMMANDEXE_TYPE_CLIPMP3:
  
              //refincereference.updateLoadingbar(60);
  
              break;
  
          case Keys.KEY_COMMANDEXE_TYPE_MP3TOM4A:
  
              //refincereference.updateLoadingbar(80);
  
          break;
  
  
  
          }*/
  
  
  
  
  
          /*
  
          if (process != null) {
  
              process.destroy();        
  
          }*/
  
  
  
  }

  and error comes written in line object that no such file or directory
  But it always gives error that gif file does not exist i have checked it wit FIle.exist() also though it gives error please help me out

• avutil/threadmessage : split the pthread condition in two

  1er décembre 2015, par Clément Bœsch

  avutil/threadmessage : split the pthread condition in two
  Fix a dead lock under certain conditions. Let’s assume we have a queue of 1
  
  message max, 2 senders, and 1 receiver.
  Scenario (real record obtained with debug added) :
  
      [...]
  
      SENDER #0 : acquired lock
  
      SENDER #0 : queue is full, wait
  
      SENDER #1 : acquired lock
  
      SENDER #1 : queue is full, wait
  
      RECEIVER : acquired lock
  
      RECEIVER : reading a msg from the queue
  
      RECEIVER : signal the cond
  
      RECEIVER : acquired lock
  
      RECEIVER : queue is empty, wait
  
      SENDER #0 : writing a msg the queue
  
      SENDER #0 : signal the cond
  
      SENDER #0 : acquired lock
  
      SENDER #0 : queue is full, wait
  
      SENDER #1 : queue is full, wait
  Translated :
  
   - initially the queue contains 1/1 message with 2 senders blocking on
  
     it, waiting to push another message.
  
   - Meanwhile the receiver is obtaining the lock, read the message,
  
     signal & release the lock. For some reason it is able to acquire the
  
     lock again before the signal wakes up one of the sender. Since it
  
     just emptied the queue, the reader waits for the queue to fill up
  
     again.
  
   - The signal finally reaches one of the sender, which writes a message
  
     and then signal the condition. Unfortunately, instead of waking up
  
     the reader, it actually wakes up the other worker (signal = notify
  
     the condition just for 1 waiter), who can’t push another message in
  
     the queue because it’s full.
  
   - Meanwhile, the receiver is still waiting. Deadlock.
  This scenario can be triggered with for example :
  
      tests/api/api-threadmessage-test 1 2 100 100 1 1000 1000
  One working solution is to make av_thread_message_queue_send,recv()
  
  call pthread_cond_broadcast() instead of pthread_cond_signal() so both
  
  senders and receivers are unlocked when work is done (be it reading or
  
  writing).
  This second solution replaces the condition with two : one to notify the
  
  senders, and one to notify the receivers. This prevents senders from
  
  notifying other senders instead of a reader, and the other way around.
  
  It also avoid broadcasting to everyone like the first solution, and is,
  
  as a result in theory more optimized.
  

  • [DH] libavutil/threadmessage.c

• Setting UseShellExecute = false doesn't work in Process.Start

  5 décembre 2015, par Alex Jolig

  There’s a good Q&A about hiding shell execute when running a process which led me to write my own code using ffmpeg :

  Process proc = new Process();
  
  proc.StartInfo.FileName = "ffmpeg";
  
  proc.StartInfo.Arguments = string.Format("-ss {0} -i \"{1}\" -t {2}{3} DB\\Media\\{4}{5} -y",
  
       TimeSpan.Parse(row.Cells["StartdgvList"].Value.ToString()),
  
       openFileDialog.FileName, _durationTime, quality, newTmpSound,
  
       GetExtension(openFileDialog.FileName));
  
  proc.StartInfo.RedirectStandardError = true;
  
  proc.StartInfo.UseShellExecute = false;
  
  proc.StartInfo.CreateNoWindow = true;
  
  if (!proc.Start()) return;
  
  StreamReader reader = proc.StandardError;
  
  string line;
  
  while ((line = reader.ReadLine()) != null && !_cancel)
  
  {
  
    //Doing something with process line
  
  }
  
  proc.Close();

  This works fine, But when I run it in a few user machines, it just stops working with no error.

  I tried removing lines which hides shell window and turned it to this :

  Process proc = new Process();
  
  proc.StartInfo.FileName = "ffmpeg";
  
  proc.StartInfo.Arguments = string.Format("-ss {0} -i \"{1}\" -t {2}{3} DB\\Media\\{4}{5} -y",
  
       TimeSpan.Parse(row.Cells["StartdgvList"].Value.ToString()),
  
       openFileDialog.FileName, _durationTime, quality, newTmpSound,
  
       GetExtension(openFileDialog.FileName));
  
  if (!proc.Start()) return;
  
  proc.Close();

  and it start working in all the machines.

  I’m wondering if there’s some sort of service or components missing in some machines which makes the process fails when console is hiding.

  I appreciate if anyone has any idea.

  P.S : I installed Visual Studio 2012 on a machine which has problem hiding shell window and it suddenly start working. Maybe VS2012 installed somwthing on the machine which solved the problem.