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• Introducing the Piwik Java Tracker – Analytics for your Java based applications

  18 novembre 2015, par Brett — Community, Development

  Hello Piwik Community !

  My name is Brett Csorba, a Software Engineer out of the US. I’d like to introduce the Piwik Java Tracker project, an easy way to track usage data within your Java applications !

  When would I need to track users in a Java application ? What’s wrong with front end tracking ?

  Absolutely nothing ! We encourage users to track information where it makes the most sense for them ! But in cases where

  • you have a 100% Java based application
  • you expose a REST layer where users can bypass your front end tracking code
  • you have valuable data you want to track that is unnecessary or too sensitive to pass back to the user

  the Piwik Java Tracker can help you track the data you need.

  What exactly can it track ?

  We aim to provide the full Tracking HTTP API. If you find we’ve left something out by mistake, let us know !

  You’ve sparked my curiosity, how would I use such a thing ?

  Well, once you’ve installed Piwik and set up your first website, you can grab the latest jar and include it in your project. The dependencies needed to both use and test this library can be found here.

  This library is intended to be used for projects that support Java 8. The released binaries are built, tested, and deployed from Oracle JDK 8.

  Using this API is as simple as creating a new request

  PiwikRequest request = new PiwikRequest(1, new URL("http://my-site.com/action")) ;

  Setting some more information if you want to

  request.setActionName("myAction") ;
  request.setPageCustomVariable("key", "value") ;

  and firing the request.

  PiwikTracker tracker = new PiwikTracker("http://your-piwik-domain.tld/piwik.php") ;
  HttpResponse response = tracker.sendRequest(request) ;

  Check out this guide to using the API for some more information !

  Looks cool so far, can I help out ?

  Yes ! Absolutely ! Download the project, try it, break it without mercy ! (Just make sure you tell us how.) Contribute to the project or let us know what we can do to it to improve it. As with all open source projects, we need your help to improve it.

• How to insert a key frame(Iframe) to a h.264 video stream in ffmpeg C++ api ?

  8 décembre 2015, par fcjy

  I have a real time video stream, and want to cut some video clips from it by accurate timestamp(pts).

  When I receiver an avpacket, I decode it, and do something and cache the avpacket. I don’t want to re-encode all avpackets, it cost cpu resource.

  There are many gop structure in H.264 stream, usually we should cut the video begin at the key frame, and end at the key frame. Otherwise the front some frames in the video clip would display error.

  Now I use av_write_frame to make avpacket to video. But sometimes the length of gop is very long, such as it could be 250, 8.3s(30 frame per second). It means the distance between two I-frame could be 250 frames. The video clip is short, I don’t want to add too many unused frames.

  How should I do ? I think i should insert a i-frame at the start position of video clip. Could I change a p-frame to i-frame ?

  Thanks your reading !

• What is wrong part in my Android code with ffmpeg ?

  6 janvier 2016, par Marko androshenko

  I want to get mixed video.(Image + Video)
  Total duration of original video is 180 sec. I want to put image to the front of video. So, I made some code in android studio.
  But I can not look any toast.
  What is wrong ? How to check the end of process ?

  ...
  path = "libray folder" ;
  ...

      private class ProcessVideo extends AsyncTask {
  
              @Override
  
              protected Void doInBackground(Void... params) {
  
  
  
                  Process ffmpegProcess = null;
  
  
  
                  try {
  
            // initialize command for process video
  
                // library is video process library.
  
                      String[] command ={path,"-i", input, "-r", "1", "-q:v", "2", "-f", "image", input};
  
  
  
  
  
                      ffmpegProcess = new ProcessBuilder(ffmpegCommand).redirectErrorStream(true).start();
  
  
  
                      OutputStream ffmpegOutStream = ffmpegProcess.getOutputStream();
  
                      BufferedReader reader = new BufferedReader(new InputStreamReader(ffmpegProcess.getInputStream()));
  
  
  
                      String line;
  
  
  
                      Log.v(THISTAG,"***Starting FFMPEG***");
  
                      while ((line = reader.readLine()) != null)
  
                      {
  
  // in progress 
  
                          Log.v(THISTAG,"***"+line+"***");
  
                      }
  
  // finish all process
  
                      Log.v(THISTAG,"***Ending FFMPEG***");
  
                      videoProcessFinishFlag = true;
  
  
  
                  } catch (IOException e) {
  
                      e.printStackTrace();
  
                  }
  
  
  
                  if (ffmpegProcess != null) {
  
                      ffmpegProcess.destroy();
  
                  }
  
                  return null;
  
              }
  
  
  
              protected void onPostExecute(Void... result) {
  
  // show result
  
                 Toast toast = Toast.makeText(VideoEditorActivity.this, "Done Processing Video", Toast.LENGTH_LONG);
  
                  toast.show();
  
              }
  
          }