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• Anomalie #3332 : Message d’erreur erroné : le nombre d’erreur n’est pas le bon

  4 novembre 2014, par Valéry -

  Pour info il s’est avéré qu’il y avait bien deux erreurs : le login / pass ne correspondaient pas à ce qui étaient en base.

• Android Exoplayer garbled mp4 video output on imagereader surface while playing fine on SurfaceView (Samsung galaxy tab s7)

  29 mars 2023, par Orcun

  Problem :

  


  I am trying to play an mp4 video file on Samsung Galaxy Tab S7 for video processing purposes. For the purpose, I use Exoplayer(v2.18.4) library to be able to play the video onto an ImageReader surface so that I can grab the frames in ImageReader.OnImageAvailableListener.

  


  I do not have any problems in getting the frames. However, the frames I acquire are garbled/corrupted like :

  


  

  


  When I saw this frame, it made me think that it is some sort of color format or codec issue for the mp4 file or device I use. In logcat, there are no errors reported.
Device uses [OMX.qcom.video.decoder.avc] decoder. Also, same video plays nicely on some other devices that use exactly the same decoder.

  


  What I tried so far :

  


  I tried a lot of things to understand the root cause and also find a solution, so my brain currently is free flowing stream. I will try to summarise, please bear with me.

  


  I use a CustomMediaCodecVideoRenderer in my app which overrides MediaCodecVideoRenderer.getMediaFormat of Exoplayer to set color format like :

  


  setInteger(MediaFormat.KEY_COLOR_FORMAT, MediaCodecInfo.CodecCapabilities.COLOR_FormatYUV420Flexible)


  


  This step proved itself necessary. Without it I get a crash simply because I cannot access the image planes of an image frame in expected YUV image format.
This unfortunately was not enough for the Samsung Galaxy Tab 7 although it was already enough for another device like Xiaomi to render the image correctly.

  


  Then I decided to use a library like ffmpeg to modify the mp4 file itself to maybe use a different profile, color format, resolution that is widely compatible in android devices. No luck so far.
a quick ffprobe on my mp4 file shows :

  


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'outputyuv169.mp4':
Metadata:
  major_brand     : isom
  minor_version   : 512
  compatible_brands: isomiso2avc1mp41
  encoder         : Lavf59.16.100
Duration: 00:03:00.02, start: 0.000000, bitrate: 4823 kb/s
Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 
1280x720 [SAR 1:1 DAR 16:9], 4820 kb/s, 30 fps, 30 tbr, 360k tbn (default)


  


  I tried even recording a simple video on the tablet itself and using that as my input file. Nevertheless, still getting similarly garbled frames.

  


  One thing I keep noticing in logcat is this line :

  


  [OMX.qcom.video.decoder.avc] using color format 0x7fa30c04 in place of 0x7f420888

  


  and

  


  [OMX.qcom.video.decoder.avc] Requested output format 0x7f420888 and got 0x7fa30c04

  


  where 0x7fa30c04 refers to YCbCr_420_SP_VENUS_UBWC. Not really sure If this has anything to do with it. I did not dive too deep into that because same log is present also on other device that renders the mp4 correctly.

  


  I would be grateful for any clue.

  


• Evolution #4427 (En cours) : Permettre (via une constante) de passer de 65 536 à 4096 le nombre ma...

  24 janvier 2020, par - Equipement

  Bonjour,
  Concernant le cache de second niveau de SPIP, c’est-à-dire celui qui contient le résultat du calcul des squelettes :

  Jusqu’à la branche 3.0 de SPIP la taille maximum du cache était par défaut de 10 Mo.

  A partir de la branche 3.1 de SPIP, le nombre maximal de fichier dans le cache est de 65 536 (et il n’y a plus de limite sur la taille du cache).
  Sur un cas réel, le cache a atteint 2 Go (soit une moyenne de 31 Ko par fichier).
  Certains hébergeurs ont un quota sur la taille, mais également sur le nombre d’inodes.
  Dans un cas réel, des sites ont ainsi atteint le quota d’inodes, ce qui empêchait l’accès à l’espace privé des sites (cf. contrib.spip.net/Plugins-Giseh#comment502510).

  Remarque : L’expérience montre que le passage d’un robot, qui n’est pas identifié par SPIP, peut suffit à garnir le cache. Or la liste des robots détectés par SPIP ne sera jamais exhaustive. Par ailleurs, pour certains robots (aspirateurs de sites ou autre) il est possible de modifier leur user-agent.

  Aussi, je propose que, via l’ajout d’une constante dans le fichier mes_options, il soit possible de fixer le nombre maximal de fichier dans le cache à 4096 (au lieu de 65 536). Cette approche, par constante optionnelle, évite d’impacter les sites qui veulent conserver la limite de 65 536 fichiers.

  En pratique, il s’agit d’offrir la possibilité de mettre dans le fichier mes_options la constante suivante :
  

  <span class="CodeRay"><span class="predefined">define</span>(<span class="string"><span class="delimiter">'</span><span class="content">_CACHE_MAX_4096_FILES</span><span class="delimiter">'</span></span>,<span class="predefined-constant">true</span>) ;
  </span>
  Télécharger

  et de prendre en compte cette constante dans le fichier ecrire/public/cacher.php de la manière suivante :

  <span class="CodeRay"><span class="keyword">function</span> <span class="function">ecrire_cache</span>(<span class="local-variable">$nom_cache</span>, <span class="local-variable">$valeur</span>) {
  <span class="comment">//    $d = substr($nom_cache, 0, 2);</span>
  <span class="comment">//    $u = substr($nom_cache, 2, 2);</span>
    <span class="local-variable">$longueur_d</span> = <span class="integer">2</span>;
    <span class="keyword">if</span> (<span class="predefined">defined</span>(<span class="string"><span class="delimiter">'</span><span class="content">_CACHE_MAX_4096_FILES</span><span class="delimiter">'</span></span>) <span class="keyword">AND</span> _CACHE_MAX_4096_FILES){
      <span class="local-variable">$longueur_d</span> = <span class="integer">1</span>;
    }
      <span class="local-variable">$d</span> = <span class="predefined">substr</span>(<span class="local-variable">$nom_cache</span>, <span class="integer">0</span>, <span class="local-variable">$longueur_d</span>);
      <span class="local-variable">$u</span> = <span class="predefined">substr</span>(<span class="local-variable">$nom_cache</span>, <span class="local-variable">$longueur_d</span>, <span class="integer">2</span>);
   
      <span class="local-variable">$rep</span> = _DIR_CACHE;
      <span class="local-variable">$rep</span> = sous_repertoire(<span class="local-variable">$rep</span>, <span class="string"><span class="delimiter">'</span><span class="delimiter">'</span></span>, <span class="predefined-constant">false</span>, <span class="predefined-constant">true</span>);
      <span class="local-variable">$rep</span> = sous_repertoire(<span class="local-variable">$rep</span>, <span class="local-variable">$d</span>, <span class="predefined-constant">false</span>, <span class="predefined-constant">true</span>);
   
      <span class="keyword">return</span> ecrire_fichier(<span class="local-variable">$rep</span> . <span class="local-variable">$u</span> . <span class="string"><span class="delimiter">"</span><span class="content">.cache</span><span class="delimiter">"</span></span>, <span class="predefined">serialize</span>(<span class="predefined">array</span>(<span class="string"><span class="delimiter">"</span><span class="content">nom_cache</span><span class="delimiter">"</span></span> => <span class="local-variable">$nom_cache</span>, <span class="string"><span class="delimiter">"</span><span class="content">valeur</span><span class="delimiter">"</span></span> => <span class="local-variable">$valeur</span>)));
  }
   
  <span class="keyword">function</span> <span class="function">lire_cache</span>(<span class="local-variable">$nom_cache</span>) {
  <span class="comment">//    $d = substr($nom_cache, 0, 2);</span>
  <span class="comment">//    $u = substr($nom_cache, 2, 2);</span>
    <span class="local-variable">$longueur_d</span> = <span class="integer">2</span>;
    <span class="keyword">if</span> (<span class="predefined">defined</span>(<span class="string"><span class="delimiter">'</span><span class="content">_CACHE_MAX_4096_FILES</span><span class="delimiter">'</span></span>) <span class="keyword">AND</span> _CACHE_MAX_4096_FILES){
      <span class="local-variable">$longueur_d</span> = <span class="integer">1</span>;
    }
      <span class="local-variable">$d</span> = <span class="predefined">substr</span>(<span class="local-variable">$nom_cache</span>, <span class="integer">0</span>, <span class="local-variable">$longueur_d</span>);
      <span class="local-variable">$u</span> = <span class="predefined">substr</span>(<span class="local-variable">$nom_cache</span>, <span class="local-variable">$longueur_d</span>, <span class="integer">2</span>);
   
      <span class="keyword">if</span> (<span class="predefined">file_exists</span>(<span class="local-variable">$f</span> = _DIR_CACHE . <span class="string"><span class="delimiter">"</span><span class="local-variable">$d</span><span class="content">/</span><span class="local-variable">$u</span><span class="content">.cache</span><span class="delimiter">"</span></span>)
          <span class="keyword">and</span> lire_fichier(<span class="local-variable">$f</span>, <span class="local-variable">$tmp</span>)
          <span class="keyword">and</span> <span class="local-variable">$tmp</span> = <span class="predefined">unserialize</span>(<span class="local-variable">$tmp</span>)
          <span class="keyword">and</span> <span class="local-variable">$tmp</span>[<span class="string"><span class="delimiter">'</span><span class="content">nom_cache</span><span class="delimiter">'</span></span>] == <span class="local-variable">$nom_cache</span>
          <span class="keyword">and</span> <span class="predefined">isset</span>(<span class="local-variable">$tmp</span>[<span class="string"><span class="delimiter">'</span><span class="content">valeur</span><span class="delimiter">'</span></span>])
      ) {
          <span class="keyword">return</span> <span class="local-variable">$tmp</span>[<span class="string"><span class="delimiter">'</span><span class="content">valeur</span><span class="delimiter">'</span></span>];
      }
   
      <span class="keyword">return</span> <span class="predefined-constant">false</span>;
  }
  </span>
  Télécharger

  Cordialement
  Equipement