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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,

• Read metadata with FFMPEG

  18 février 2015, par Martin Delille

  I’m looking for a way to print a video or audio file metadata using FFMPEG.

  I tried the following command :

  ffmpeg -i DirtyLove.mov

  And got the following result :

  ffmpeg version 2.5.3 Copyright (c) 2000-2015 the FFmpeg developers
  
    built on Feb 16 2015 18:01:39 with Apple LLVM version 6.0 (clang-600.0.56) (based on LLVM 3.5svn)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/2.5.3 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libx264 --enable-libmp3lame --enable-libvo-aacenc --enable-libxvid --disable-indev=qtkit --enable-vda
  
    libavutil      54. 15.100 / 54. 15.100
  
    libavcodec     56. 13.100 / 56. 13.100
  
    libavformat    56. 15.102 / 56. 15.102
  
    libavdevice    56.  3.100 / 56.  3.100
  
    libavfilter     5.  2.103 /  5.  2.103
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Guessed Channel Layout for  Input Stream #0.1 : stereo
  
  Guessed Channel Layout for  Input Stream #0.2 : stereo
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '../DirtyLove/DirtyLove.mov':
  
    Metadata:
  
      major_brand     : qt
  
      minor_version   : 537199360
  
      compatible_brands: qt
  
      creation_time   : 2007-09-27 11:23:38
  
    Duration: 00:01:57.16, start: 0.000000, bitrate: 17918 kb/s
  
      Stream #0:0(eng): Video: mjpeg (jpeg / 0x6765706A), yuvj422p(pc, bt470bg/unknown/unknown), 720x576 [SAR 72:72 DAR 5:4], 14839 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc (default)
  
      Metadata:
  
        creation_time   : 2007-09-27 11:23:38
  
        handler_name    : Gestionnaire d�alias Apple
  
        encoder         : Photo - JPEG
  
        timecode        : 10:04:01:11
  
      Stream #0:1(eng): Audio: pcm_s16be (twos / 0x736F7774), 48000 Hz, 2 channels, s16, 1536 kb/s (default)
  
      Metadata:
  
        creation_time   : 2007-09-27 11:23:38
  
        handler_name    : Gestionnaire d�alias Apple
  
      Stream #0:2(eng): Audio: pcm_s16be (twos / 0x736F7774), 48000 Hz, 2 channels, s16, 1536 kb/s (default)
  
      Metadata:
  
        creation_time   : 2007-09-27 11:23:38
  
        handler_name    : Gestionnaire d�alias Apple
  
      Stream #0:3(eng): Data: none (tmcd / 0x64636D74) (default)
  
      Metadata:
  
        creation_time   : 2007-09-27 11:29:22
  
        handler_name    : Gestionnaire d�alias Apple
  
        timecode        : 10:04:01:11
  
  At least one output file must be specified

  There should be a timecode that I can’t see.

  Any ideas ?

• Rails : MP4 videos showing up blank in Firefox (but works in Chrome)

  10 février 2015, par Mark Boulder

  I got this Rails app with uploaded MP4 videos that play back just fine in Chrome - but why do they show up blank in Firefox ?

  The video appears on the page and plays just fine if I download it :

  <video loop="loop" src="/path/to/whatever.mp4?1234567"></video>

  From Rails I did :

  <%= video_tag photo.attachment_url(:medium) %>

  I tried adding Mime::Type.register "video/mp4", :mp4 to config/initializers/mime_types.rb but to no avail.

  Live app : http://runnable.com/VNkNeJ9wpNZJBEma/paperclip-mp4-problem

  Click Run and navigate to the last post to see the MP4. Note that Runnable is very slow. If it says something bad happened in the terminal, try reloading the page until it disappears.

  • http://caniuse.com/#feat=video
  • Rails : MIME type issues with .m4v files
  • HTML5 video (mp4 and ogv) problems in Safari and Firefox - but Chrome is all good