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• Anomalie #3236 (Nouveau) : opendir et readdir

  27 juin 2014, par Ybbet SPIP

  Hello,

  Juste pour signaler qu’il y a une erreur d’écriture (par conseillé en tout cas) sur :
  - SPIP 3.1 :
  http://core.spip.org/projects/spip/repository/entry/spip/ecrire/public/composer.php#L475
  http://core.spip.org/projects/spip/repository/entry/spip/ecrire/inc/install.php#L348

  - SPIP 3.0 :
  http://core.spip.org/projects/spip/repository/entry/branches/spip-3.0/ecrire/public/composer.php#L392
  http://core.spip.org/projects/spip/repository/entry/branches/spip-3.0/ecrire/inc/install.php#L341

  - SPIP 2.1 :
  http://core.spip.org/projects/spip/repository/entry/branches/spip-2.1/ecrire/public/composer.php#L392
  http://core.spip.org/projects/spip/repository/entry/branches/spip-2.1/ecrire/inc/install.php#L272

  - SPIP 2.0 : http://core.spip.org/projects/spip/repository/entry/branches/spip-2.0/ecrire/public/composer.php#L403

  On a
  

  while ($f = readdir($d))
  

  Au lieu de
  

  while (($f = readdir($d)) !== false)
  

  
  Ecriture adoptée partout ailleurs dans le core de SPIP.

• Anomalie #4245 (Fermé) : Petit bug de sous_repertoire()

  11 décembre 2018

  Découvert hier, un enchaînement tueur :

  <span class="CodeRay"><span class="local-variable">$demo</span> = sous_repertoire(_DIR_TMP, <span class="string"><span class="delimiter">'</span><span class="content">demo_</span><span class="delimiter">'</span></span>);
  <span class="comment">// $demo = 'tmp/demo_'</span>
  <span class="local-variable">$bug</span> = sous_repertoire(<span class="local-variable">$demo</span>, <span class="string"><span class="delimiter">'</span><span class="content">potiron</span><span class="delimiter">'</span></span>);
  </span>
  Télécharger

  Le système a rencontré une erreur lors de l’écriture du fichier tmp/demo/potiron/.plat.

  En fait, lors de l’appel de sous_repertoire($base, $subdir), la fonction vire les / et _ finaux de $base (mais pas le _ final éventuel de $subdir).
  Il se retrouve ici à vouloir créer le répertoire tmp/demo/potiron au lieu de tmp/demo_/potiron et n’y arrive pas, vu que le répertoire parent (demo) n’existe pas.

  Histoire¶

  Après quelques fouilles archéologiques, il se trouve que le problème survient probablement avec r8196 qui refactore différemment le code de r6395 :
  - 6395 fil@rezo.n     if (!preg_match(',[/_]$,', $base)) $base .= '/';
  - 8196 esj@rezo.n     if (preg_match(',[/_]$,', $base)) $base = substr($base,0,-1);
  - 16035 fil@rezo.n     $base = rtrim($base, '/_');

  Le tout devait être, je suppose, pour prendre en compte les excentriques répertoires "plats" (dépendants maintenant de la présence de la constante _CREER_DIR_PLAT).

  Corrections¶

  Plusieurs corrections possibles :
  - A) virer la constante _CREER_DIR_PLAT et ses actions, et le rtrim de ce souligné (on est en 2018…).
  - B) simplement appliquer le rtrim du souligné si _CREER_DIR_PLAT est présent (ça corrige pas le bug que $subdir n’aurait alors pas ce rtrim non plus !)
  - C) B + corriger le rtrim pour $subdir de la même manière.

  Je suis partisan de A) sur le trunk, et B) ou C) sur 3.2 et 3.1.

  Des avis ?

• Why iFrame is a good idea

  15 octobre 2009

  I’ve seen some hilariously uninformed posts about the new Apple iFrame specification. Let me take a minute to explain what it actually is.

  First off, as opposed to what the fellow in the Washington Post writes, it’s not really a new format. iFrame is just a way of using formats that we’ve already know and love. As the name suggests, iFrame is just an i-frame only H.264 specification, using AAC audio. An intraframe version of H.264 eh ? Sounds a lot like AVC-Intra, right ? Exactly. And for exactly the same reasons - edit-ability. Whereas AVC-Intra targets the high end, iFrame targets the low end.

  Even when used in intraframe mode, H.264 has some huge advantage over the older intraframe codecs like DV or DVCProHD. For example, significantly better entropy coding, adaptive quantization, and potentially variable bitrates. There are many others. Essentially, it’s what happens when you take DV and spend another 10 years working on making it better. That’s why Panasonic’s AVC-Intra cameras can do DVCProHD quality video at half (or less) the bitrate.

  Why does iFrame matter for editing ? Anyone who’s tried to edit video from one of the modern H.264 cameras without first transcoding to an intraframe format has experienced the huge CPU demands and sluggish performance. Behind the scenes it’s even worse. Because interframe H.264 can have very long GOPs, displaying any single frame can rely on dozens or even hundreds of other frames. Because of the complexity of H.264, building these frames is very high-cost. And it’s a variable cost. Decoding the first frame in a GOP is relatively trivial, while decoding the middle B-frame can be hugely expensive.

  Programs like iMovie mask that from the user in some cases, but at the expensive of high overhead. But, anyone who’s imported AVC-HD video into Final Cut Pro or iMovie knows that there’s a long "importing" step - behind the scenes, the applications are transcoding your video into an intraframe format, like Apple Intermediate or ProRes. It sort of defeats one of the main purposes of a file-based workflow.

  You’ve also probably noticed the amount of time it takes to export a video in an interframe format. Anyone who’s edited HDV in Final Cut Pro has experienced this. With DV, doing an "export to quicktime" is simply a matter of Final Cut Pro rewriting all of the data to disk - it’s essentially a file copy. With HDV, Final Cut Pro has to do a complete reencode of the whole timeline, to fit everything into the new GOP structure. Not only is this time consuming, but it’s essentially a generation loss.

  iFrame solves these issues by giving you an intraframe codec, with modern efficiency, which can be decoded by any of the H.264 decoders that we already know and love.

  Having this as an optional setting on cameras is a huge step forward for folks interested in editing video. Hopefully some of the manufacturers of AVC-HD cameras will adopt this format as well. I’ll gladly trade a little resolution for instant edit-ability.