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• How to stitch(concat) two transport stream with two different resolution and I-frame slices format without loosing resolution and slices information

  2 octobre 2019, par AnkurTank

  I have been trying to test a use case with steam captured from multimedia device and that didn’t work. And then I have been trying to create this specific transport stream for like two days now without success, so requesting some help.

  I need to create transport stream with two different resolution and two different slicing format.

  I divided the task in following steps and in last two steps I need help.

  Step 1 : Download sample video with resolution : 1920x1080.
  I downloaded big buck bunny mp4 .

  Step 2 : Create transport stream with following
  resolution : 1920x720, H264 I frame slices per frame : 1
  I used following ffmpeg commands to do that.

  #Rename file to input.mp4
  
  $ mv bbb_sunflower_1080p_30fps_normal.mp4 input.mp4
  
  #Extract transport stream
  
  $ ffmpeg -i input.mp4 -c copy first.ts

  first.ts is having 1980x720 resolution and one H264 I slice per frame.

  Step 3 : Create another transport stream with smaller resolution using following commands

  #Get mp4 with lower resolution.
  
  $ ffmpeg -i input.mp4 -s 640x480 temp.mp4
  
  #Extract trans port stream from mp4
  
  $ ffmpeg -i temp.mp4 -c copy low_r.ts

  Step 4 : Edit(and re-encode ?) low_r.ts to have two H264 I frame slices.
  I used following command to achieve it.

  $ x264 --slices 4 low_r.ts -o second.ts

  However when I play this second.ts on vlc using following command it doesn’t play

  $ vlc ./second.ts 

  And using Elacard StreamEye software when I analyze the transport stream I see that it has 4 H264 I slices in only two times other than that lot of H264 p slices and H264 B slices.
  Need help here to figure out why second.ts doesn’t play and why slicing is not correct.

  Step 5 : Combine both the transport stream without loosing resolution and slicing information.
  Don’t know command for this. Need help here.
  I tried ffmpeg but that combines two stream with different resolution and makes one file with one resolution.

  Any suggestions/pointers would help me proceed. Let me also know if any of the above steps are not fine too.

• How to stitch(concat) two transport stream with two different resolution and I-frame slices format without loosing resolution and slices information

  2 octobre 2019, par ART

  I have been trying to test a use case with steam captured from multimedia device and that didn't work. And then I have been trying to create this specific transport stream for like two days now without success, so requesting some help.

  



  I need to create transport stream with two different resolution and two different slicing format.

  



  I divided the task in following steps and in last two steps I need help.

  



  Step 1 : Download sample video with resolution : 1920x1080.
  
 I downloaded big buck bunny mp4 .

  



  Step 2 : Create transport stream with following
  
resolution : 1920x720, H264 I frame slices per frame : 1
  
I used following ffmpeg commands to do that.

  



  #Rename file to input.mp4
$ mv bbb_sunflower_1080p_30fps_normal.mp4 input.mp4
#Extract transport stream
$ ffmpeg -i input.mp4 -c copy first.ts


  



  first.ts is having 1980x720 resolution and one H264 I slice per frame.

  



  Step 3 : Create another transport stream with smaller resolution using following commands

  



  #Get mp4 with lower resolution.
$ ffmpeg -i input.mp4 -s 640x480 temp.mp4
#Extract trans port stream from mp4
$ ffmpeg -i temp.mp4 -c copy low_r.ts


  



  Step 4 : Edit(and re-encode ?) low_r.ts to have two H264 I frame slices.
I used following command to achieve it.

  



  $ x264 --slices 4 low_r.ts -o second.ts


  



  However when I play this second.ts on vlc using following command it doesn't play

  



  $ vlc ./second.ts 


  



  And using Elacard StreamEye software when I analyze the transport stream I see that it has 4 H264 I slices in only two times other than that lot of H264 p slices and H264 B slices. 
Need help here to figure out why second.ts doesn't play and why slicing is not correct.

  



  Step 5 : Combine both the transport stream without loosing resolution and slicing information.
Don't know command for this. Need help here.
I tried ffmpeg but that combines two stream with different resolution and makes one file with one resolution.

  



  Any suggestions/pointers would help me proceed. Let me also know if any of the above steps are not fine too.

  


• Evolution #4471 : singulier_ou_pluriel pour l’arabe

  1er juin 2020, par George Kandalaft

  Correction :

  <span class="CodeRay"><span class="comment">/**
   * Afficher un message "un truc"/("deux trucs" pour l'arabe)/"N trucs" 
   * Les items sont à indiquer comme pour la fonction _T() sous la forme :
   * "module:chaine" 
   *
   * @param int $nb : le nombre
   * @param string $chaine_un : l'item de langue si $nb vaut un (ou $nb > 10 pour l'arabe)
   * @param string $chaine_plusieurs : l'item de lanque si $nb > 1 ($nb est compris entre 3 et 10 pour l'arabe)
   * @param string $var : La variable à remplacer par $nb dans l'item de langue (facultatif, défaut "nb")
   * @param array $vars : Les autres variables nécessaires aux chaines de langues (facultatif)
   * @return string : la chaine de langue finale en utilisant la fonction _T()
   */</span>
  <span class="keyword">function</span> <span class="function">ar_singulier_ou_pluriel</span>(<span class="local-variable">$nb</span>, <span class="local-variable">$chaine_un</span>, <span class="local-variable">$chaine_plusieurs</span>, <span class="local-variable">$var</span> = <span class="string"><span class="delimiter">'</span><span class="content">nb</span><span class="delimiter">'</span></span>, <span class="local-variable">$vars</span> = <span class="predefined">array</span>()) {
      <span class="keyword">if</span> (!<span class="local-variable">$nb</span> = <span class="predefined">intval</span>(<span class="local-variable">$nb</span>)) {
          <span class="keyword">return</span> <span class="string"><span class="delimiter">'</span><span class="delimiter">'</span></span>;
      }
      <span class="keyword">if</span> (!<span class="predefined">is_array</span>(<span class="local-variable">$vars</span>)) {
          <span class="keyword">return</span> <span class="string"><span class="delimiter">'</span><span class="delimiter">'</span></span>;
      }
      <span class="local-variable">$vars</span>[<span class="local-variable">$var</span>] = <span class="local-variable">$nb</span>;
   
      <span class="keyword">if</span> (<span class="predefined">$GLOBALS</span>[<span class="string"><span class="delimiter">'</span><span class="content">spip_lang</span><span class="delimiter">'</span></span>] == <span class="string"><span class="delimiter">'</span><span class="content">ar</span><span class="delimiter">'</span></span>) {
          <span class="local-variable">$fem</span> = <span class="predefined">substr</span>(_T(<span class="local-variable">$chaine_un</span>), -<span class="integer">2</span>);
          <span class="keyword">switch</span> (<span class="predefined-constant">true</span>) {
              <span class="keyword">case</span> (<span class="local-variable">$nb</span> == <span class="integer">1</span>):
                  <span class="keyword">if</span> (<span class="local-variable">$fem</span> == <span class="string"><span class="delimiter">'</span><span class="content">ة</span><span class="delimiter">'</span></span>) {
                      <span class="local-variable">$un</span> = _T(<span class="local-variable">$chaine_un</span>) . <span class="string"><span class="delimiter">'</span><span class="content"> واحدة</span><span class="delimiter">'</span></span>;
                  } <span class="keyword">else</span> {
                      <span class="local-variable">$un</span> = _T(<span class="local-variable">$chaine_un</span>) . <span class="string"><span class="delimiter">'</span><span class="content"> واحد</span><span class="delimiter">'</span></span>;
                  }
                  <span class="keyword">return</span> <span class="local-variable">$un</span>;
                  <span class="keyword">break</span>;
              <span class="keyword">case</span> (<span class="local-variable">$nb</span> == <span class="integer">2</span>):
                  <span class="keyword">if</span> (<span class="local-variable">$fem</span> == <span class="string"><span class="delimiter">'</span><span class="content">ة</span><span class="delimiter">'</span></span>) {
                      <span class="local-variable">$deux</span> = <span class="predefined">rtrim</span>(_T(<span class="local-variable">$chaine_un</span>), <span class="local-variable">$fem</span>) . <span class="string"><span class="delimiter">'</span><span class="content">تان</span><span class="delimiter">'</span></span>;
                  } <span class="keyword">else</span> {
                      <span class="local-variable">$deux</span> = _T(<span class="local-variable">$chaine_un</span>) . <span class="string"><span class="delimiter">'</span><span class="content">ان</span><span class="delimiter">'</span></span>;
                  }
                  <span class="keyword">return</span> <span class="local-variable">$deux</span>;
                  <span class="keyword">break</span>;
              <span class="keyword">case</span> (<span class="local-variable">$nb</span> ><span class="integer">2</span> &#38;&#38; <span class="local-variable">$nb</span> &lt; <span class="integer">11</span>):
                  <span class="keyword">return</span> _T(<span class="local-variable">$chaine_plusieurs</span>, <span class="local-variable">$vars</span>);
                  <span class="keyword">break</span>;
              <span class="keyword">default</span>:
                  <span class="local-variable">$chaine_un</span> = <span class="local-variable">$nb</span> . <span class="string"><span class="delimiter">'</span><span class="content"> </span><span class="delimiter">'</span></span> . <span class="local-variable">$chaine_un</span>;
                  <span class="keyword">return</span> _T(<span class="local-variable">$chaine_un</span>, <span class="local-variable">$vars</span>);
          }
      } <span class="keyword">else</span> {
          <span class="keyword">if</span> (<span class="local-variable">$nb</span> > <span class="integer">1</span>) {
              <span class="keyword">return</span> _T(<span class="local-variable">$chaine_plusieurs</span>, <span class="local-variable">$vars</span>);
          } <span class="keyword">else</span> {
              <span class="keyword">return</span> _T(<span class="local-variable">$chaine_un</span>, <span class="local-variable">$vars</span>);
          }
      }
  }
  </span>
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