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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.

• Church of JPEG

  25 mai 2014, par Mans — Random ramblings

  Some time has passed since I last wrote about the antics of the IJG, purveyor of the well-known JPEG image manipulation library. With the major Linux distributions as well as the Firefox and Chrome browsers having switched to the libjpeg-turbo fork, there has been little reason to pay attention to … Continue reading →

• Video won't play with Android's native MediaPlayer, however it plays with Dropbox's video player

  12 novembre 2014, par Nachi

  I’m having trouble playing a certain .3gp file (from a Dropbox link) with Android’s MediaPlayer. However the file magically plays without problems from the Dropbox Android app.

  I’m trying to play it using this :

  Intent intent = new Intent(android.content.Intent.ACTION_VIEW);
  
  intent.setData(Uri.parse("https://www.dropbox.com/s/zpiqwmxka6llavt/SketchyFile.3gp"));
  
  startActivity(intent);

  and my manifest contains

  which gives a "Can’t play this video" error.

  

  Logcat shows :

  I/NuCachedSource2(89): new range: offset= 2245017
  
  I/ChromiumHTTPDataSource(89): connect to https://dl.dropbox.com/0/view/a1crokuhpprsaeo/SketchyFile.3gp @2245017
  
  I/NuCachedSource2(89): ERROR_END_OF_STREAM
  
  E/MediaPlayer(3629): error (1, -2147483648)
  
  E/MediaPlayer(3629): Error (1,-2147483648)
  
  D/VideoView(3629): Error: 1,-2147483648

  If I try to play it from the Dropbox Android app, Dropbox’s video player has no problem playing it.

  

  According to ffmpeg’s ffprobe tool I could verify that the media type is not something exotic to Android.

  Is Dropbox performing some weird transcoding voodoo and is there a way I can make this work in a similar way ?

  EDIT : Here’s some more insight into DropBox’s encoding voodoo.