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• How can I mux (or encapsulate) H.264 RTP output into a container using FFMPEG ?

  7 octobre 2013, par Grad

  I am working on the effects of network losses in video transmission. In order to simulate the network losses I use a simple program which drops random RTP packets from the output of H.264 RTP encoding.

  I use Joint Model (JM) 14.2 in order to encode the video. However, I don't use AnnexB format as my output, instead I choose the output as RTP packets. The JM output is generated as RTP packets with RTP headers and payload as a sequence. After that, some of RTP packets are dropped by using a simple program. Then, I can decode the output bitstream by using also JM and it's error concealment methods.

  The main purpose of this process is to evaluate the differences created by network losses on the human video quality perception. In order to measure the perceived quality, the shown video must be in its decoded form (i.e. full resolution) or it can be decodable at the receiver side. The RTP packets created by the JM Encoder cannot be decoded without the JM software installed. However, with the proper header (or container) most video players are able to decode the bitstream. So, the my goal in this question is to encapsulate my encoded RTP packet bitstream in a common container such as AVI or MP4 to have my content decodable at the receiver computer.

  The format of the encoded bitstream in RTP packetized form is as follows :

       ----------------------------------------------------------------------
  
       | RTP Header #1 | RTP Payload #1 | RTP Header #2 | RTP Payload #2 |...
  
       ----------------------------------------------------------------------

  In order to find the video quality, I want to make a subjective test with these bitstreams. I can make these test by using the full resolution data decoded by myself whereas it's very inconvenient to crowdsource this subjective test with GBs of video data on the Internet. So, I want to mux these bitstreams into a container (i.e. AVI) by using FFMPEG. I have tried to decode these bitstreams with FFMPEG and FFPLAY ; however, both of them didn't work. I also tried the following command and it didn't work, either.

      ffmpeg - f h264 -i  -vcodec copy -r 25 out.avi

  Which format or muxer should I use ? Do I need to convert these files to any other format ?

• Projects from behind-the-scenes

  28 septembre 2018, par Jake Thornton

  Kia ora from the marketing team !

  Marketing team ? That’s right ! You haven’t heard from us in the past, but we’ve been working in the background to create a better experience for you, our dedicated Matomo community.

  Kia ora ? Well, that just means “hello” in Maori, we’re based in New Zealand you see.

  The Matomo marketing team has some really exciting projects in the works we wanted to share with you, but first, there’s someone I want to introduce :

  Meet Joselyn from the Matomo Marketing team

  Meet Joselyn, one half of the Matomo marketing team and our Digital Marketing and Communications Specialist. Joselyn has come on board to help us communicate more frequently and effectively as we continue our mission to be the #1 free open source analytics platform in the world. Please take it away, Joselyn !

  “Hi everyone ! The team here at Matomo have been doing an incredible job passionately driving the cause for user privacy and data ownership and uniting that with a love for digital analytics. It’s exciting being a part of a team unafraid to push on with their hearts on their sleeves and their values at the forefront of everything they do. I hope to bring to light all the fantastic things happening in our world of web analytics as well as across the globe.

  

  Our online world is fascinating when we think about what we can achieve with analytics, but there’s room to improve. We see newer technologies, but old ways of working which don’t take into account a person’s safety online. So we hope to champion a new future which looks set to be much more meaningful. Ensuring you get the best experience, but also feel protected with the knowledge that we get it. Your data and privacy isn’t for sale.

  I also hear you guys, the community, have followed Matomo since the beginning, which is wonderful ! I hope you’ll be able to join us as we grow and learn. We’ve got so many thrilling things to share with you. The highs, the lows and everything in between. Cheers !”

  Thanks Joselyn ! On top of working to engage the community and new users, Joselyn will also be keeping the rest of the Matomo team on our toes getting the inside scoop on what’s happening within the Development and Support teams ; as well as giving you behind-the-scenes access to what’s going on here at Matomo. We have a big vision and with so many things happening right now, we want to get you involved as much as possible.

  It may sound a bit clichéd but I’m saying it anyway – without your help, Matomo wouldn’t be here today.

  Help us choose a logo

  So first of all, we want you to say thank you and second we’d be delighted if you could help choose our new logo ! As you may already know, we changed our name from Piwik to Matomo at the start of the year. Though it was fun using a cool font (Aileron Heavy btw) as a quick fix for our name change, it was a temporary solution. The Matomo team has been involved in the direction of creating a new logo, but now we’re stumped ! We have three different concepts to choose from so please help us out !

  Click here to logo poll

  A new website for Matomo.org !

  Other exciting marketing projects include a new website design (yay !) – to everyone gasping nervously…don’t worry, nothing in what we offer is changing. We are and always will be a freely accessible open source analytics platform, just wanted to quickly clear the air on that one !

  We also have some video projects in the works to make the Matomo experience better for everyone and there are even rumours a brand video that tells the Matomo story is on the way ;)

  What next ? With Joselyn on board and loads of exciting projects happening, it won’t be long until you hear from us again, so keep an eye out for our next update as we reveal the winning Matomo logo.

  Be sure to follow us on Facebook, Twitter and Github – we promise to be more active than what we have been !

• Anomalie #4332 (Nouveau) : Critère {par sinum titre,num titre} pas assez strict

  10 mai 2019, par Eric Camus

  Bonjour,

  Suite a l’utilisation des critères suivant pour une boucle article : "par sinum titre,num titre !par date", je ne m’attendais pas a ce que tout article commençant par un chiffre soit mis en avant comme cela devait être uniquement pour ceux ayant la syntaxe "10. Titre" (chiffre, point, espace, titre). Hors c’est ce qui se passe car la requête SLQ est la suivante :
  

  <span class="CodeRay"><span class="class">SELECT</span> <span class="keyword">CASE</span> (<span class="integer">0</span>+articles.titre) <span class="keyword">WHEN</span> <span class="integer">0</span> <span class="keyword">THEN</span> <span class="integer">1</span> <span class="keyword">ELSE</span> <span class="integer">0</span> <span class="keyword">END</span> <span class="keyword">AS</span> sinum, <span class="integer">0</span>+articles.titre <span class="keyword">AS</span> num1,
   articles.date, articles.id_article, articles.virtuel, articles.titre, articles.date_modif, articles.descriptif, articles.lang
  <span class="keyword">FROM</span> spip_articles <span class="keyword">AS</span> <span class="string"><span class="delimiter">`</span><span class="content">articles</span><span class="delimiter">`</span></span>
  <span class="keyword">WHERE</span> (articles.statut = <span class="string"><span class="delimiter">'</span><span class="content">publie</span><span class="delimiter">'</span></span>)
      <span class="keyword">AND</span> (articles.id_rubrique = <span class="integer">90</span>)
      <span class="keyword">AND</span> ((articles.id_article <span class="keyword">NOT</span> <span class="keyword">IN</span> (<span class="integer">250</span>)))
  <span class="keyword">ORDER</span> <span class="keyword">BY</span> sinum, num1, articles.date <span class="directive">DESC</span>
  </span>
  Télécharger

  
  Est-ce voulu ou une coquille ?
  Pour ma part, j’ai donc fabriquer un nouveau critère : "parnumstricte" qui ne reconnait que l’écriture "10. Titre" (chiffre, point, espace, titre) et qui donne comme requête :
  

  <span class="CodeRay"><span class="class">SELECT</span> <span class="keyword">CASE</span> <span class="keyword">WHEN</span> articles.titre REGEXP <span class="string"><span class="delimiter">'</span><span class="content">^[0-9]+[.] </span><span class="delimiter">'</span></span> <span class="keyword">THEN</span> <span class="integer">0</span> <span class="keyword">ELSE</span> <span class="integer">1</span> <span class="keyword">END</span> <span class="keyword">AS</span> ap_sinum,
   <span class="keyword">CASE</span> <span class="keyword">when</span> articles.titre REGEXP <span class="string"><span class="delimiter">'</span><span class="content">^[0-9]+[.] </span><span class="delimiter">'</span></span> <span class="keyword">then</span> <span class="integer">0</span>+articles.titre <span class="keyword">else</span> <span class="integer">0</span> <span class="keyword">end</span> <span class="keyword">AS</span> ap_num,
   articles.date, articles.id_article, articles.virtuel, articles.titre, articles.date_modif, articles.descriptif, articles.lang
  <span class="keyword">FROM</span> spip_articles <span class="keyword">AS</span> <span class="string"><span class="delimiter">`</span><span class="content">articles</span><span class="delimiter">`</span></span>
  <span class="keyword">WHERE</span> (articles.statut = <span class="string"><span class="delimiter">'</span><span class="content">publie</span><span class="delimiter">'</span></span>)
      <span class="keyword">AND</span> (articles.id_rubrique = <span class="integer">90</span>)
      <span class="keyword">AND</span> ((articles.id_article <span class="keyword">NOT</span> <span class="keyword">IN</span> (<span class="integer">250</span>)))
  <span class="keyword">ORDER</span> <span class="keyword">BY</span> ap_sinum, ap_num, articles.date <span class="directive">DESC</span>
  </span>
  Télécharger

  Je vous donne la fonction simple de ce critère (a mettre dans "mes_options) :
  

  <span class="CodeRay"><span class="comment">// truc a l'arrache qui marche seul {parnumstricte} comme seul critere qui altere l'ordre</span>
  <span class="comment">// et uniquement sur la base spip_articles</span>
  <span class="keyword">function</span> <span class="function">critere_parnumstricte</span>(<span class="local-variable">$idb</span>,&#38;<span class="local-variable">$boucle</span>,<span class="local-variable">$crit</span>) {
      <span class="local-variable">$b</span>=&#38;<span class="local-variable">$boucle</span>[<span class="local-variable">$idb</span>];
      <span class="keyword">if</span>(<span class="predefined">isset</span>(<span class="local-variable">$b</span>->from[<span class="string"><span class="delimiter">'</span><span class="content">articles</span><span class="delimiter">'</span></span>])) {
          <span class="local-variable">$b</span>->select[]=<span class="string"><span class="delimiter">'</span><span class="content">CASE WHEN articles.titre regexp </span><span class="char">\'</span><span class="content">^[0-9]+[.] </span><span class="char">\'</span><span class="content"> THEN 0 ELSE 1 END AS ap_sinum</span><span class="delimiter">'</span></span>;
          <span class="local-variable">$b</span>->select[]=<span class="string"><span class="delimiter">'</span><span class="content">CASE when articles.titre regexp </span><span class="char">\'</span><span class="content">^[0-9]+[.] </span><span class="char">\'</span><span class="content"> then 0+articles.titre else 0 end AS ap_num</span><span class="delimiter">'</span></span>;
          <span class="local-variable">$b</span>->order[]=<span class="string"><span class="delimiter">"</span><span class="content">'ap_sinum,ap_num,articles.date DESC'</span><span class="delimiter">"</span></span>;
      }
  }
  </span>
  Télécharger

  Ce critère "parnumstricte" fait la même chose que "par sinum titre,num titre !par date" mais ne propulse en avant que les articles ayant la syntaxe stricte : "10. Titre" (chiffre, point, espace, titre).

  Nota : c’est normal que se soit une fonction brouillon et très sale !!, je ne l’utilise qu’une fois et uniquement sur une boucle ARTICLES. Je l’ai citée comme exemple de ce qui pourrait être implanter dans le vrai critère "par sinum titre" n’ayant pas eu le temps d’en finalisé l’analyse.