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• ffmpeg record before and after applying filters

  7 mai 2019, par Mark

  I’m trying to use ffmpeg to do the following things :

  • acquire input streaming [OK]
  • save to disk the video as is [TODO]
  • apply filter, i.e. drawtext [OK]
  • save to disk the overlayed video [OK]
  • preview the overlayed video [OK]

  Here my current command line :

  ffmpeg -rtsp_transport tcp -i  -vf "[in]drawtext=textfile='text.txt': reload=1: font=arial: fontcolor=red: fontsize=80: box=1: boxcolor=yellow@0.5: boxborderw=5: x=(w-text_w)/2: y=(h-text_h)/2[out]" -vcodec libx264 -f tee -map 0:v "[f=mp4]test.mp4|[f=nut]pipe:" | ffplay pipe:

  The only thing I don’t understand how to do is the recording of the video before drawtext. I guess I have to create another tee :

  INPUT ---> TEE ---->RECORD
  
                  |
  
                  |-->FILTERS---> TEE ---->RECORD
  
                                       |
  
                                       |-->PLAY

  So I tried with this cumbersome command :

  ffmpeg -rtsp_transport tcp -i  -vcodec libx264 -f tee -map 0:v "[f=mp4]before.mp4|[f=nut]pipe:" | ffmpeg -f mp4 -i pipe: -vf "[in]drawtext=textfile='text.txt': reload=1: font=arial: fontcolor=red: fontsize=80: box=1: boxcolor=yellow@0.5: boxborderw=5: x=(w-text_w)/2: y=(h-text_h)/2[out]" -vcodec libx264 -f tee -map 0:v "[f=mp4]after.mp4|[f=nut]pipe:" | ffplay pipe:

  It doesn’t throw errors, records "before.mp4" but neither "after.mp4" nor the preview are working. Surely I forgot something in the syntax.

• Today we celebrate Data Privacy Day 2019

  28 janvier 2019, par Jake Thornton — Privacy
  Today we celebrate Data Privacy Day 2019 !!!

  What is Data Privacy Day ?

  Wikipedia tells us that : The purpose of Data Privacy Day is to raise awareness and promote privacy and data protection best practices.

  Our personal data is our online identity. When you think what personal data means – our phone records, credit card transactions, GPS position, IP addresses, browsing history and so much more. All so valuable and personal to us as human beings.

  That’s why we cannot take our personal data online for granted. We have a right to know which websites collect our data and how it’s then used, something that’s often not visible or easily recognisable when browsing.

  What Data Privacy Day means to Matomo

  Every year the team at Matomo uses this day as a chance to reflect on how far the Matomo (formerly Piwik) project has come. But then also reflect how far we still have to go in spreading the message that our data and personal information online matters.

  2018 saw the introduction of the EU General Data Protection Regulation (GDPR) to protect people’s data online. As a team, Matomo was at the forefront of this development in the analytics space and have since built a GDPR Manager to ensure our users can be fully compliant with the GDPR.

  With every new release of Matomo, we are ensuring that security continues to be at the highest standard and we will continue to be committed to our bug bounty program. Our most recent release of Matomo 3.8.0 alone added a Two Factor Authentication (2FA) feature and a password brute force prevention.

  What next for Matomo and data privacy ?

  As always, security is a top priority for every new release of Matomo and continues to only get better and better. We have a duty to spread our message further that the protection of personal data matters and today is a vital reminder of that. We are, and forever will be, the #1 open-source (and free to use) web analytics platform in the world that fully respects user privacy and gives our users 100% data ownership.

  In 2018 we changed our name, we updated our logo and website, and advanced our platform to compete with the most powerful web analytics tools in the world, all so we can spread our message further and continue our mission.

  Come with us on this exciting journey. Now is the time to take back control of your data and let’s continue creating a safer web for everyone.

  Please help us spread this message.

• Insert text on sequence of image and create video using imagemagick or graphicsmagick with node.js

  12 décembre 2015, par Keyur Sakaria

  I am trying to create a sequence of image with dynamic text using imagemagick and then convert into video using ffmpeg. The issue I am facing right now :

  1. I was able to put text on image but now I want to move that text and sync with the character on image. Below is the link of what I have achieved

  http://tinypic.com/player.php?v=2ciic8g%3E&s=9#.VmrAZUp97Dc

  The bright white "text goes here" text should sync with the character behind

  Below is the code which I have written

  gm("original_images/moving/" + text + ".png")
  
      .fill("#FCF7FB")
  
      .fontSize(40)
  
      .drawText(x, moveY, "text goes here", "center")
  
      .font("font/BTTTRIAL_1.ttf")
  
      .write("newImages/demo" + i + ".png", function(err)
  
      {
  
          count++;
  
          console.log("success : " + err);
  
          console.log("i : " + i);
  
          console.log("moving : " + moveX);
  
  
  
          if(count == 72)
  
          {
  
              console.log(count);
  
              var date = moment().format('MMMMDDYYYYhmmssa');
  
              var cmd = 'ffmpeg -r 17 -i newImages/demo%d.png -c:v libx264 -r 24 -pix_fmt yuv420p output/' + date + '.mp4';
  
  
  
              exec(cmd, function(error, stdout, stderr)
  
              {
  
                  console.log(error)
  
                  console.log(stdout)
  
                  console.log(stderr)
  
              });
  
          }
  
      });

  I am trying to calculate x and y according to image and im getting the values in decimal, which graphicsmagick is not considering and rounding it thus text is not syncing with image and goes up and down

  If you have any other suggestions or ways to achieve what im trying to do please let me know.

  Thanks in advance.