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• Revision 4379 : On n’insère la feulle de style du plugin que dans la conf... plus dans ...

  5 novembre 2010, par kent1 — Log

  On n’insère la feulle de style du plugin que dans la conf... plus dans insert_head On améliore un peu cette feuille de style par défaut

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  24 octobre 2010, par Cerdic — Log

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• FFmpeg pauses the extraction of frames at 20% (but when closed, dumps all frames to disk)

  1er décembre 2019, par Nicke Manarin

  I’m trying to extract frames from a video using FFmpeg. I want to be able to control which frames to extract, by setting the start, end and FPS values.

  The problem is, that after the extraction begins, FFmpeg stops after 20% of the way. It always stops there, independently of the frame count.

  This is the code that I’m using :

  var start = TimeSpan.FromMilliseconds(SelectionSlider.LowerValue);
  
  var end = TimeSpan.FromMilliseconds(SelectionSlider.UpperValue);
  
  var fps = FpsIntegerUpDown.Value;
  
  var count = CountFrames(); //Duration x FPS
  
  var folder = Path.Combine(RootFolder, "Import");
  
  var path = Path.Combine(folder, $"%0{count.ToString().Length + 1}d.png");
  
  
  
  try
  
  {
  
      //Create temporary folder.
  
      if (Directory.Exists(folder))
  
          Directory.Delete(folder, true);
  
  
  
      Directory.CreateDirectory(folder);
  
  
  
      CaptureProgressBar.Value = 0;
  
      CaptureProgressBar.Maximum = count;
  
  
  
      var info = new ProcessStartInfo(UserSettings.All.FfmpegLocation)
  
      {
  
          Arguments = $" -i \"{VideoPath}\" -vsync 2 -progress pipe:1 -vf scale={VideoWidth}:{VideoHeight} -ss {start:hh\\:mm\\:ss\\.fff} -to {end:hh\\:mm\\:ss\\.fff} -hide_banner -c:v png -r {fps} -vframes {count} \"{path}\"",
  
          CreateNoWindow = true,
  
          ErrorDialog = false,
  
          UseShellExecute = false,
  
          RedirectStandardError = true,
  
          RedirectStandardOutput = true
  
       };
  
  
  
       _process = new Process();
  
       _process.OutputDataReceived += (sender, e) =>
  
       {
  
           Debug.WriteLine(e.Data);
  
  
  
           if (string.IsNullOrEmpty(e.Data))
  
               return;
  
  
  
           var parsed = e.Data.Split('=');
  
  
  
           switch (parsed[0])
  
           {
  
               case "frame":
  
                   Dispatcher?.InvokeAsync(() => { CaptureProgressBar.Value = Convert.ToDouble(parsed[1]); });
  
                   break;
  
  
  
               case "progress":
  
                   if (parsed[1] == "end" && IsLoaded)
  
                       GetFiles(folder); //Get all files from the output folder.
  
  
  
                   break;
  
            }
  
      };
  
  
  
  _process.ErrorDataReceived += (sender, e) =>
  
  {
  
      if (!string.IsNullOrEmpty(e.Data))
  
          throw new Exception("Error while capturing frames with FFmpeg.") { HelpLink = $"Command:\n\r{info.Arguments}\n\rResult:\n\r{e.Data}" };
  
  };
  
  
  
  _process.StartInfo = info;
  
  _process.Start();
  
  _process.BeginOutputReadLine();
  
  
  
  //Just to wait...
  
  await Task.Factory.StartNew(() => _process.WaitForExit());

  So, after starting the import process, FFmpeg will extract some frames, and after reaching around 20%, it will pause the extraction.

  frame=95
  
  fps=5.79
  
  stream_0_0_q=-0.0
  
  bitrate=N/A
  
  total_size=N/A
  
  out_time_us=1400000
  
  out_time_ms=1400000
  
  out_time=00:00:01.400000
  
  dup_frames=0
  
  drop_frames=0
  
  speed=0.0854x
  
  
  
  progress=continue
  
  frame=106
  
  fps=6.25
  
  stream_0_0_q=-0.0
  
  bitrate=N/A
  
  total_size=N/A
  
  out_time_us=1583333
  
  out_time_ms=1583333
  
  out_time=00:00:01.583333
  
  dup_frames=0
  
  drop_frames=0
  
  speed=0.0933x
  
  progress=continue
  
  
  
  frame=117
  
  fps=6.67
  
  stream_0_0_q=-0.0
  
  bitrate=N/A
  
  total_size=N/A
  
  out_time_us=1766667
  
  out_time_ms=1766667
  
  out_time=00:00:01.766667
  
  dup_frames=0
  
  drop_frames=0
  
  speed=0.101x
  
  progress=continue

  Something strange : if I close the app while is the extraction is paused, suddenly FFmpeg will dump all frames to the folder.

  Why would FFmpeg pause the extraction at all (But continue doing in memory) ?
  Is there any way for me to force FFmpeg to extract the frames normally ?

  PS : It does not happen while using FFmpeg via cmd, so it must be something in code.