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• Senior Software Engineer to join Piwik Product Engineering team

  10 janvier 2015, par Matthieu Aubry — Jobs

  At Piwik and Piwik PRO we develop the leading open source web analytics platform, used by more than one million websites worldwide. Our vision is to help the world liberate their analytics data by building the best open alternative to Google Analytics.

  The Piwik platform collects, stores and processes a lot of information : hundreds of millions of data points each month. We create intuitive, simple and beautiful reports that delight our users.

  Are you seeking a new challenge ? We are currently looking for a full time Software Developer to join our small and dedicated Product Engineering team.

  At Piwik PRO we practise agile methodology, test driven development and fast release cycles. The main technologies we work with are PHP5, JavaScript (AngularJS, jQuery) and MySQL and our tools include PhpStorm, Github, Travis CI and Slack.

  As a Software Developer for Piwik PRO, you will be writing open source code that will directly benefit 250,000+ Piwik users in 200+ countries and 50 languages.

  Key Responsibilities

  • Writing server-side code (PHP 5) and front-end code (JavaScript).
  • Creating robust high-volume production applications and developing prototypes quickly.
  • Tackling new problems as we continue to push technology forward.
  • Assisting other developers by writing peer code reviews.
  • Improving and updating our platform developer guides.
  • Lead by example, able to self manage and use initiative to get things done.

  Minimum qualifications

  • Experience in product development, security, the open source philosophy and usable interface design.
  • Understanding of, and practical experience with PHP5 and JavaScript application development.
  • 3+ years experience building successful production software systems.
  • Solid knowledge of testing principles and OOP.
  • Strong analytical and coding skills.
  • Strong written communication.

  Location

  • Offices based in Wellington, New Zealand or Wrocław, Poland.
  • However remote work is also possible.

  Apply online

  To apply for this position, please Apply online here. We look forward to receiving your applications !

• libavcodec/jpeg2000 : fix tag tree reset

  27 août 2020, par Gautam Ramakrishnan

  libavcodec/jpeg2000 : fix tag tree reset
  The implementation of the tag tree did not
  
  set the correct reset value for the encoder.
  
  This lead to inefficent tag tree being encoded.
  
  This patch fixes the implementation of the
  
  ff_tag_tree_zero() function.
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/j2kenc.c
  • [DH] libavcodec/jpeg2000.c
  • [DH] libavcodec/jpeg2000.h
  • [DH] tests/ref/vsynth/vsynth1-jpeg2000
  • [DH] tests/ref/vsynth/vsynth1-jpeg2000-97
  • [DH] tests/ref/vsynth/vsynth2-jpeg2000
  • [DH] tests/ref/vsynth/vsynth2-jpeg2000-97
  • [DH] tests/ref/vsynth/vsynth3-jpeg2000
  • [DH] tests/ref/vsynth/vsynth3-jpeg2000-97
  • [DH] tests/ref/vsynth/vsynth_lena-jpeg2000
  • [DH] tests/ref/vsynth/vsynth_lena-jpeg2000-97

• FFmpeg : encoding in webm (vp9) for windows

  2 juillet 2015, par Seltymar

  I’m trying to encode jpegs to a webm video in vp9 on windows 7.

  I followed the instructions from webmproject in 2 pass.
  I changed \dev\nul by NUL.

  ffmpeg.exe -i %4d.jpg -c:v libvpx-vp9 -pass 1 -b:v 1000K -threads 8 -speed 4 -tile-columns 6 -frame-parallel 1 -auto-alt-ref 1 -lag-in-frames 25 -an -f webm NUL
  
  
  
  ffmpeg.exe -i %4d.jpg  -c:v libvpx-vp9 -pass 2 -b:v 1000K -threads 8 -speed 1 -tile-columns 6 -frame-parallel 1 -auto-alt-ref 1 -lag-in-frames 25 -c:a libopus -b:a 64k -f webm out.webm

  but after the first pass, it tells me "output file is empty, nothing was encoded". But the second pass create the video.

  I also tryed in one pass :

  ffmpeg -i %4d.jpg -c:v libvpx-vp9 -crf 10 -b:v 0 output.webm

  Then I want to use the output video using html5 video and canvas tags as below.

      
  
  
  
  
  
  
  
  
  
  <canvas>
  
          Your browser does not support the canvas tag.
  
  </canvas> 
  
  <code class="echappe-js">&lt;script&gt;<br />
  
  <br />
  
  <br />
  
          var videos = document.createElement('video');<br />
  
          videos.src = &quot;output.webm&quot;;<br />
  
          videos.type = &quot;video/webm&quot;;<br />
  
          videos.load(); <br />
  
          videos.play();<br />
  
          videos.playbackRate = 1;<br />
  
          var videoImage0 = document.getElementById('canvas');        <br />
  
          videoImage0.width = 2700;<br />
  
          videoImage0.height = 1350;<br />
  
  <br />
  
          var videoImageContexts =videoImage0.getContext('2d');<br />
  
          //// background color if no video present<br />
  
          videoImageContexts.fillStyle = '#0000ff';<br />
  
          videoImageContexts.fillRect(0, 0, videoImage0.width, videoImage0.height);       <br />
  
          animate();<br />
  
  <br />
  
      function animate() {<br />
  
          requestAnimationFrame(animate);<br />
  
          update();<br />
  
  <br />
  
      }<br />
  
  <br />
  
      function update() {<br />
  
  <br />
  
          if (videos.readyState === videos.HAVE_ENOUGH_DATA) {<br />
  
              videoImageContexts.drawImage(videos, 0, 0);<br />
  
          }<br />
  
      }<br />
  
  &lt;/script&gt;
  

  result :

  1. With both methods the output video can’t be read in VLC but it can be read if I drag and drop in firefox or chrome or using the video tag only.
  2. The html page above works correctly on chrome but not in firefox. In firefox, the color is not correct like if the blue channel was translated.
     

  I think the problem is the encoding with FFmpeg. I’m using the static build from zeranoe. Here is the version

  and libvpx is enable.

  My questions :

  • Is there a problem on my command line ?

  • Is there a problem in my JS code that could lead to error in the decoding process ?