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• Generate video with ffmpeg to play using JavaFX

  25 mai 2015, par taskman

  People always say to post a new question so I am posting a new question that relates to Generate video with ffmpeg for JavaFX MediaPlayer

  The images I use can be downloaded from here https://www.dropbox.com/s/mt8yblhfif113sy/temp.zip?dl=0. It is a 2.2GB zip file with 18k images, still uploading, might take some time. The images are slices of a 3D object. I need to display images every 10ms to 20ms. I tried it with Java, but just couldn’t get faster than 30ms+ so now I am trying to generate a video that will display images as fast as I want without worrying about memory or CPU power.

  People will be using my software to slice the objects and then generate the videos to be played later one. The player might run on a cheap laptop or might run on a Raspberry Pi. I need to make sure the slicer will work on any OS and that people don’t need to install too much extra stuff to make it work. It would be best if I can just include everything that is needed in the download of the app.

  I also posted here
  https://ffmpeg.zeranoe.com/forum/viewtopic.php?f=15&t=2474&sid=4f7a752f909202fbec19afc9edaf418c

  I am using Windows 7 and I have VLC installed. The ffmpeg version is

  ffmpeg version N-72276-gf99fed7 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 4.9.2 (GCC)

  I also tried the command lines posted on the linked question

  This line produced the video and JavaFX didn’t have any errors

  ffmpeg -f image2 -r 50 -i "Mandibular hollow 1 micron.gizmofill%d.gizmoslice.jpg" -s 1638x1004 -vcodec mpeg4 -qscale 1 -f mp4 Timelapse.mp4

  

  This line also produced the video, but JavaFX had an error : "Caused by : MediaException : MEDIA_UNSUPPORTED : Unrecognized file signature !"

  ffmpeg -f image2 -r 50 -i "Mandibular hollow 1 micron.gizmofill%d.gizmoslice.jpg" -s 1920x1080 -vcodec mpeg4 -qscale 1 Timelapse.avi

  

  I also tried this two pass encoding I believe. It produced the video, but didn’t play

  ffmpeg -r 50 -i "Mandibular hollow 1 micron.gizmofill%d.gizmoslice.jpg" -s 1638x1004 -r 50 -b:v 1550k -bt 1792k -vcodec libx264 -pass 1 -an combined50.flv && ffmpeg -y -r 50 -i "Mandibular hollow 1 micron.gizmofill%d.gizmoslice.jpg" -s 1638x1004 -r 50 -b:v 1550k -bt 1792k -vcodec libx264 -pass 2 -vpre hq -acodec libfaac -ab 128k combined50.flv

  This is my JavaFX code. As you can see I tried the Oracle video and that worked fine.

  public class FXMLDocumentController implements Initializable {
  
  
  
      @FXML
  
      private Label label;
  
  
  
      @FXML
  
      private MediaView mediaView;
  
  
  
      @FXML
  
      private void handleButtonAction(ActionEvent event) {
  
          System.out.println("You clicked me!");
  
  
  
  //        final File f = new File("http://download.oracle.com/otndocs/products/javafx/oow2010-2.flv");
  
          final File f = new File("C:/Users/kobus/Dropbox/JavaProjects/Gizmetor/temp/Timelapse.avi");
  
  
  
  //        "C:/Users/kobus/Dropbox/JavaProjects/Gizmetor/temp/combined50.avi.flv"
  
  //        http://download.oracle.com/otndocs/products/javafx/oow2010-2.flv
  
  
  
          Media media = new Media(f.toURI().toString());
  
  //        Media media = new Media("http://download.oracle.com/otndocs/products/javafx/oow2010-2.flv");
  
          MediaPlayer mediaPlayer = new MediaPlayer(media);
  
          mediaPlayer.setAutoPlay(true);
  
  
  
          mediaPlayer.play();
  
          mediaView.setMediaPlayer(mediaPlayer);
  
          label.setText("Hello World!");
  
          System.out.println(mediaPlayer.isAutoPlay());
  
  
  
  //        mediaView
  
      }
  
  
  
      @Override
  
      public void initialize(URL url, ResourceBundle rb) {
  
          // TODO
  
      }
  
  
  
  }

• aaccoder : rewrite PNS implementation

  6 septembre 2015, par Rostislav Pehlivanov

  aaccoder : rewrite PNS implementation
  This commit rewrites the PNS implementation and significantly
  
  improves sonic quality.
  The previous implementation marked an incredibly big amount
  
  of SFBs to predict when there was no need for this and this
  
  resulted in quite a large amount of artifacts. Also the
  
  quantization was incorrect (av_clip(4+log2f(...))) which
  
  led to 3x the intensity for PNS values leading to even more
  
  artifacts.
  This commit rewrites the PNS search function and introduces
  
  a major change : the PNS values are synthesized and are compared
  
  to the current coefficients in addition to passing through
  
  the revised checks to see whether PNS can be used.
  This decreases distortions and makes the current PNS implementation
  
  mainly focused on replacing any low-power non-zero bands as well
  
  as adding any zeroed bands back.
  The current encoder’s performance is enough (especially with
  
  IS) so PNS isn’t really required except to fill in the occasional
  
  few bands as well as extend any zeroed high frequency, so this
  
  combination which is already enabled by default works
  
  to get as much quality as it can within the bits allowed.
  Signed-off-by : Rostislav Pehlivanov <atomnuker@gmail.com>
  

  • [DH] libavcodec/aaccoder.c

• How to get your Piwik plugin translated in many languages ?

  8 septembre 2015, par Stefan Giehl — Community, Development, Plugins

  About a year ago we introduced the Piwik Marketplace to make it easy for developers to share their plugins with all Piwik users.

  As Piwik is currently available in 54 languages we would love to have as many plugins as possible available in at least a few of those languages.

  Currently most plugins on the Marketplace are only available in English and sometimes some other languages. To improve this situation, we offer plugin developers the possibility to use the power of our translators community to get their plugins translated.

  Some plugin developers are already using this service and some very popular plugins like BotTracker or CustomOptOut have already been translated in more than 10 languages !

  Getting translations for your plugin

  As long as you are developing an open source plugin hosted on Github, you may get in touch with us (translations@piwik.org) in order to get your plugin translated by the Piwik translators community.

  You will need an account on Transifex.com. If you use Transifex with a social login, please ensure to set a password in your account settings. This will be required for fetching new translations into your plugin repository.

  Importing your plugin’s strings in the translation platform

  While doing the initial setup for your plugin, we will import your english translation file (en.json) in your Github plugin repository and we will configure an auto-update for this file. Source strings on Transifex will automatically synchronise with your plugin repository. When you change any string in your en.json translation file, the updated English strings will automatically be imported in Transifex.

  How to fetch your plugins translations into your repository

  As soon as we have set up your plugin within our project Piwik on Transifex and there are new translations available, you will be able to update your plugin translations using the Piwik console. You will need a locally installed Piwik with development mode enabled, and your plugin installed. To update the translations go to the Piwik directory on your development box and execute the following command :

  ./console translations:update -u {YourTransifexUserName} -p {YourTransifexPassword} -P {YourPluginName}

  We are looking forward to seeing your Piwik plugins available in more languages ! For more information, check out our Translations plugin developer guide.

  Happy hacking,