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• Pipe series of images from java application to ffmpeg subprocess

  20 juin 2014, par Marco

  I am looking for a way to stream series of images (jpegs) from java application into FFMpeg STDIN pipe.
  FFMpeg should process these images and create a video file as an output.

  FFMpeg is executed as sub process of java application with the following command "ffmpeg.exe -i pipe:0 out.avi"

  When i run "ffmpeg -i input.jpg out.avi" command in the console, i get the "out.avi" file as expected

  But when i use the following tester code in my java application, i got an error.

  Code in Java application :

  File ffmpeg_output_msg = new File("ffmpeg_output_msg.txt");
  
  ProcessBuilder pb = new ProcessBuilder(
  
          "ffmpeg.exe","-i","pipe:0","out.avi");
  
  pb.redirectErrorStream(true);
  
  pb.redirectOutput(ffmpeg_output_msg);
  
  pb.redirectInput(ProcessBuilder.Redirect.PIPE);
  
  Process p = pb.start();
  
  OutputStream ffmpegInput = p.getOutputStream();
  
  
  
  byte[] image;
  
  File file = new File("input.jpg");
  
  image = new byte[(int)file.length()];
  
  
  
  FileInputStream fileInputStream = new FileInputStream(file);
  
  fileInputStream.read(image);
  
  
  
  ImageInputStream iis = ImageIO.createImageInputStream(
  
          new ByteArrayInputStream(image));
  
  BufferedImage img = ImageIO.read(iis);
  
  
  
  ImageIO.write(img, "JPEG", ffmpegInput);

  FFMpeg output :

  ffmpeg version N-59664-g94cf4f8 Copyright (c) 2000-2014 the FFmpeg developers built on Jan 7 2014 22:07:02 with gcc 4.8.2 (GCC)
  configuration : —enable-gpl —enable-version3 —disable-w32threads —enable-avisynth —enable-bzlib —enable-fontconfig —enable-frei0r —enable-gnutls —enable-iconv —enable-libass —enable-libbluray —enable-libcaca —enable-libfreetype —enable-libgsm —enable-libilbc —enable-libmodplug —enable-libmp3lame —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libopenjpeg —enable-libopus —enable-librtmp —enable-libschroedinger —enable-libsoxr —enable-libspeex —enable-libtheora —enable-libtwolame —enable-libvidstab —enable-libvo-aacenc —enable-libvo-amrwbenc —enable-libvorbis —enable-libvpx —enable-libwavpack —enable-libx264 —enable-libxavs —enable-libxvid —enable-zlib

  libavutil      52. 62.100 / 52. 62.100
  
  libavcodec     55. 47.100 / 55. 47.100
  
  libavformat    55. 22.102 / 55. 22.102
  
  libavdevice    55.  5.102 / 55.  5.102
  
  libavfilter     4.  0.103 /  4.  0.103
  
  libswscale      2.  5.101 /  2.  5.101
  
  libswresample   0. 17.104 /  0. 17.104
  
  libpostproc    52.  3.100 / 52.  3.100

  pipe: : Invalid data found when processing input

  Any ideas how to make it work ?

  Thank you very much for your time.

• Ffmpeg gdigrab records black window when capturing graphics-intensive flight simulator

  23 mars 2021, par iter

  I am trying to capture video from XPlane, a popular flight simulator. I'm running on Windows.

  



  Normally, I can capture individual windows using gdigrab, but when I use it on an XPlane window like so...

  



  ffmpeg -f gdigrab -framerate 30 -i "X-System" -b:v 300K capture.mp4


  



  ...I get a video file that's the right dimensions but is all black. I imagine this may have something to do with how XPlane talks directly to the GPU. I should add that if I capture the entire desktop like so...

  



  ffmpeg -f gdigrab -framerate 30 -i desktop -b:v 300K capture.mp4


  



  ...I get everything including the simulator window, but naturally with unrelated windows in the capture, including windows sitting on top of the simulator window.

  



  Is there a way for gdigrab to capture video this GPU-intensive window alone ? Is there a different tool I can use ?

  


• ffmpeg's strange behaviour-Conversion started when I close my application

  16 décembre 2013, par m.qayyum

  I'm using ffmpeg in my application to rotate video, but problem is that when I start conversion ffmpeg only shows it's version information and not start the actual conversion, but when I close my application ffmpeg process remains in Running Processes in Taskbar and start to convert the file.

  ffmpeg output
  

  Here is my code, please tell me where i'm doing it wrong.

  void ConvertVideo(object[] arr) {
  
  
  
      string Argument = (string)arr[0];
  
      string OutputFolder = (string)arr[1];
  
      string ConvertedFile = (string)arr[2];
  
  
  
  
  
      UpdateStatus("Converting! Please wait...");
  
      ffmpeg = new Process();
  
      ffmpeg.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
  
      ffmpeg.StartInfo.FileName = "ffmpeg.exe";
  
      ffmpeg.StartInfo.UseShellExecute = false;
  
      ffmpeg.StartInfo.RedirectStandardError = true;
  
      ffmpeg.StartInfo.RedirectStandardOutput = true;
  
      ffmpeg.StartInfo.CreateNoWindow = true;
  
      ffmpeg.StartInfo.Arguments = Argument;
  
      ffmpeg.Start();
  
      myStreamReader = ffmpeg.StandardError;
  
      outputLine = myStreamReader.ReadLine();
  
      UpdateRTB(outputLine);//Write line to ritchtextbox
  
      do
  
      {
  
          if (outputLine.Contains("muxing overhead"))
  
          {
  
              UpdateStatus("Muxing video");
  
          }
  
  
  
          if (outputLine.StartsWith("frame"))
  
          {
  
              UpdateStatus("Converting video");
  
          }
  
      }
  
      while (!(ffmpeg.HasExited & (string.Compare(outputLine, "") == 0 | outputLine == null)));
  
      ffmpeg.Close();
  
      myStreamReader.Close();
  
      UpdateStatus("Convertion completed successfully");
  
  }