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• Catalyst Open Source Academy

  16 janvier 2015, par Matthieu Aubry — Community

  The Open Source Academy is an initiative designed to provide training and work experience for young New Zealand technologists. Catalyst organises the Academy to show young technologists how to participate in open source communities and to fully explore their passion for IT through freely available open source tools.

  It has been running annually since 2011. We are proud that Piwik project could participate in the Academy again this year !

  What students got done

  It’s amazing what a few young students can get done in four days of participating in an open source project like Piwik ! They were able to quickly get started with Piwik, and continued to make useful contributions to the Piwik analytics platform.

  New Darkness theme

  Liam has created a new dark theme for Piwik called Darkness.

  

  To create the theme, Liam had to improve Piwik core stylesheets and created this pull request : Reuse the LESS variable for white color across all stylesheets.

  Accessibility improvements

  We were lucky to spend time with Julius, a Catalyst employee who is blind. He showed us in great detail how difficult and time consuming it can be for a blind user to use Piwik. For example we noticed how complicated it was for Julius to navigate the menus, to get to the main content, and to use the calendar and the Website selector. During this presentation we also noticed that Piwik was not yet usable with the keyboard.

  As a result of this session with Julius we got to work with the students to improve accessibility in Piwik.

  

  (photo source)

  List of accessibility improvements

  All these pull requests were created by the students and have been successfully merged into Piwik :

  • see the focus of menu items when tabbing through the page
  • Tweaks to improve accessibility (section around graph, better tooltip, set language in html)
  • Added h3 tags to widget headers
  • when main Menu is focused, display submenu
  • Add “Skip to content” feature when user presses tab key
  • Improved accessibility by putting offscreen text in the widget title

  To learn more about accessibility in Piwik check out this issue on our tracker.

  Summary

  Working with young students was fun and interesting. We were excited to see how much they got done in such a short time !

  At Piwik and Piwik PRO we are committed to building the best open analytics platform, and we will continue to support students who want to take part in the Piwik adventure.

  Be well,

• Can't write .mp4 files - Could not open codec 'libx264' : Unspecified error

  17 février 2015, par margaridagomes

  Days ago I installed the latest 2.4 branch withou ffmpeg. I’m using Ubuntu 14.04 and I don’t have at all ffmpeg in my Virtual Machine.

  I want to write .mp4 video files and the input files are also .mp4. The input codec is avc1.

  I can’t obtain any results, the errors can be seen below.

  Error

  [libx264 @ 0x9357bc0] broken ffmpeg default settings detected
  
  [libx264 @ 0x9357bc0] use an encoding preset (e.g. -vpre medium)
  
  [libx264 @ 0x9357bc0] preset usage: -vpre <speed> -vpre <profile>
  
  [libx264 @ 0x9357bc0] speed presets are listed in x264 --help
  
  [libx264 @ 0x9357bc0] profile is optional; x264 defaults to high
  
  Could not open codec 'libx264': Unspecified error
  
  Could not open the output video for write: /home/margarida/exams_2014/Output.mp4
  
  </profile></speed>

  Simplified Code

  int main(int argc, char *argv[]) {
  
              VideoWriter outputVideo;
  
  
  
              // Get Codec Type
  
              int ex = static_cast<int>(cap.get(CV_CAP_PROP_FOURCC));
  
  
  
              // Transform from int to char via Bitwise operators
  
              char EXT[] = { (char) (ex &amp; 0XFF), (char) ((ex &amp; 0XFF00) >> 8),
  
                              (char) ((ex &amp; 0XFF0000) >> 16), (char) ((ex &amp; 0XFF000000)
  
                                      >> 24), 0 };
  
  
  
              // Acquire input size
  
              Size S = Size((int) cap.get(CV_CAP_PROP_FRAME_WIDTH),
  
                              (int) cap.get(CV_CAP_PROP_FRAME_HEIGHT));
  
  
  
              cout &lt;&lt; "Input codec type: " &lt;&lt; EXT &lt;&lt; endl;
  
  
  
              // Open the output
  
              outputVideo.open(newname, ex, cap.get(CV_CAP_PROP_FPS), S, true);
  
  
  
              if (!outputVideo.isOpened()) {
  
                  cout &lt;&lt; "Could not open the output video for write " &lt;&lt; endl;
  
                          return -1;
  
                      }
  
  
  
                      while (true) {
  
                          cap >> frame;
  
                          if (frame.empty()) {
  
                              cerr &lt;&lt; "nao apanhou frame" &lt;&lt; endl;
  
                              break;
  
                          }
  
  
  
                          cinzento = acinzentar(frame);
  
                          imshow("Cinzento", cinzento);
  
  
  
                          outputVideo.write(cinzento);
  
  
  
                          switch(waitKey(10)){
  
  
  
                          case 27:
  
                              //'esc' has been pressed (ASCII value for 'esc' is 27)
  
                              //exit program.
  
                              return 0;
  
  
  
                          }
  
                      }
  
                     return 0;
  
                  }
  
  </int>

  My cmake was this :

  cmake -D WITH_TBB=ON -D CMAKE_INSTALL_PREFIX=/usr/local -D BUILD_NEW_PYTHON_SUPPORT=ON -D WITH_V4L=ON -D INSTALL_C_EXAMPLES=ON -D INSTALL_PYTHON_EXAMPLES=ON -D BUILD_EXAMPLES=ON -D WITH_QT=ON -D WITH_OPENGL=ON -D WITH_VTK=ON -D WITH_FFMPEG=OFF -D WITH_IPP=OFF ..

  Can anyone help solving my problem ?

  Thanks in advance.

• Piwik 2.10.0 – Release Candidate

  22 décembre 2014, par Piwik Core Team — Community

  We are proud to announce that the release candidate for Piwik 2.10.0 is now available !

  How do I upgrade to the release candidate ?

  You can upgrade to the release candidate in one click, by following instructions in this FAQ.

  Think you’ve found a bug ?

  Please create a bug report in our issue tracker.

  What’s new in Piwik 2.10.0 ?

  Since our last release Piwik 2.9.1 one month ago, over 100 issues have been closed. We’ve focused on fixing bugs, improving performance, and we created a new plugin that will let you better scale Piwik to very high traffic websites using Redis.

  Much improved Log Analytics

  Log Analytics is the powerful little-known feature of Piwik that lets you import dozens of different server logs into Piwik. In Piwik 2.10.0 you can now import Netscaler logs, IIS Advanced Logging Module logs, W3C extended logs and AWS CloudFront logs. Piwik will also automatically track the username as the User ID and/or the Page Generation Time when it is found in the server logs.

  Better scalability using Redis (advanced users)

  At Piwik PRO we are working on making Piwik scale when tracking millions of requests per month. In this release we have revamped the Tracking API. By using the new QueuedTracking plugin you can now queue tracking requests in a Redis database, which lets you scale the Piwik tracking service. The plugin is included as Free/libre software in the core Piwik platform. More information in the QueuedTracking user guide.

  Better performance

  A few performance challenges have been fixed in this release.

  The Visitor Log and the Live API will render much faster on very high traffic websites. Any custom date ranges that you have selected as default in your User Settings (eg. ‘Last 7 days’ or ‘Previous 30 days’) will now be pre-processed so that your analytics dashboard will always load quickly.

  For users on shared hosting, the real time widgets could be use a lot of server resource as they are refreshed every ten seconds. We’ve improved this by only requesting data when the Browser Tab containing the Real time widgets is active.

  Other changes

  We packed in many other changes in this release such as compatibility with Mysql 5.6 and Geo location support for IPv6 addresses. A community member made Piwik compatible with Internet Explorer 9 when running in compatibility mode (which is still used in several companies).

  The Tracker algorithm has been updated : when an existing visit uses a new Campaign then it will force creating a new visit (same behavior as Google Analytics).

  If you need professional support or guidance, get in touch with Piwik PRO.

  Changelog for Piwik 2.10.0 – we plan to release Piwik 2.10.0 around 2015 Jan 5th.

  Happy Analytics, and we wish you a nice holiday season !