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• Split video in specific number of frame with ffmpeg in c#

  30 avril 2017, par Loic Bch

  I want to split a video into a specific number of image :
  I’m using ffmpeg/EmguCV in C#.

  I capture a video from a webcam and i need to split the video into 59 images. i’m using -i command with ffmpeg to split my video into a number of images.

  The problem is that the number of images i get at the end is different at each capture because the duration of the video is not exactly the same due to fps drop.

  So if anyone know if it’s possible to specify that i want the video to be equally cut into 59 images. (Or any other idea to get what i want)

  (at the moment i’m taking the number of images i get from the cut and divide it by 59 then i’m taking one image in "the result" but i’ts not precise at all because if i get a decimal number im losing or adding images)

• Anomalie #4189 (Nouveau) : extraire_multi mélange un /li /ul final avec le de langue ajouté...

  5 octobre 2018, par jluc -

  Quand la langue de la chaîne n’est pas la langue désirée,
  extraire_multi appelle code_echappement qui insère

  au début, ok,
  mais qui colle aussi un

  immédiatement à la fin.

  En général c’est OK, mais pas quand la dernière ligne du texte est le dernier item d’une énumération,
  car alors ce ajouté est pris comme partie prenante de cette dernière ligne par l’appel suivant à propre,
  et le HTML qui sort de ce |propre sera mal emboité car il finira par au lieu de

  Cf #4187

  Dans le cas où le texte se termine par une liste, il faut insérer \n\n pour s’assurer que le /div ajouté par code_echappement reste en dehors de la liste.

  Cf simulation avec https://zone.spip.net/trac/spip-zone/changeset/111853/spip-zone

  Et pour corriger, dans le corps de extraire_multi (https://core.spip.net/projects/spip/repository/entry/spip/ecrire/inc/filtres.php#L1595 ),
  il faut insérer 2 fins de lignes quand ça se termine par /ul,
  entre les 2 lignes suivantes :
  

  <span class="CodeRay">    <span class="local-variable">$mode</span> = <span class="predefined">preg_match</span>(<span class="string"><span class="delimiter">'</span><span class="content">,span><span class="delimiter">'</span></span> . _BALISES_BLOCS . <span class="string"><span class="delimiter">'</span><span class="content">)[>[:space:]],iS</span><span class="delimiter">'</span></span>, <span class="local-variable">$trad_propre</span>) ? <span class="string"><span class="delimiter">'</span><span class="content">div</span><span class="delimiter">'</span></span> : <span class="string"><span class="delimiter">'</span><span class="content">span</span><span class="delimiter">'</span></span>;
      <span class="local-variable">$trad</span> = code_echappement(<span class="local-variable">$trad</span>, <span class="string"><span class="delimiter">'</span><span class="content">multi</span><span class="delimiter">'</span></span>, <span class="predefined-constant">false</span>, <span class="local-variable">$mode</span>);
  </span></span>
  Télécharger

  Ce qui donne :
  

  <span class="CodeRay">    <span class="local-variable">$mode</span> = <span class="predefined">preg_match</span>(<span class="string"><span class="delimiter">'</span><span class="content">,span><span class="delimiter">'</span></span> . _BALISES_BLOCS . <span class="string"><span class="delimiter">'</span><span class="content">)[>[:space:]],iS</span><span class="delimiter">'</span></span>, <span class="local-variable">$trad_propre</span>) ? <span class="string"><span class="delimiter">'</span><span class="content">div</span><span class="delimiter">'</span></span> : <span class="string"><span class="delimiter">'</span><span class="content">span</span><span class="delimiter">'</span></span>;
      <span class="keyword">if</span> (<span class="local-variable">$mode</span>==<span class="string"><span class="delimiter">'</span><span class="content">div</span><span class="delimiter">'</span></span> <span class="keyword">and</span> (<span class="predefined">substr</span>(<span class="predefined">rtrim</span>(<span class="local-variable">$trad_propre</span>), -<span class="integer">5</span>)==<span class="string"><span class="delimiter">'</span><span class="content"></span><span class="delimiter">'</span></span>)
          <span class="local-variable">$trad</span> .= <span class="string"><span class="delimiter">"</span><span class="char">\n</span><span class="char">\n</span><span class="delimiter">"</span></span>;
      <span class="local-variable">$trad</span> = code_echappement(<span class="local-variable">$trad</span>, <span class="string"><span class="delimiter">'</span><span class="content">multi</span><span class="delimiter">'</span></span>, <span class="predefined-constant">false</span>, <span class="local-variable">$mode</span>);
  </span></span>
  Télécharger

• Why the bitrate shown during processing differs so much from the final bitrate after processing using ffmpeg ?

  28 juillet 2016, par rpgmaker

  Using ffmpeg, why the bitrate shown during processing differs so much from the final bitrate after processing ?

  This command on a 1080p source :

  ffmpeg -i "$name" -i "$subname" -map 0 -map 1 -vf scale=-1:720 -c:v libx264 -preset veryslow -crf 21 -c:a aac -b:a 256k -c:s:0 srt -disposition:s:0 default -metadata:s:s:0 language=eng -metadata:s:v:0 title="$title" "$new"

  Shows this output :
  

  Which essentially averages 1300-1400 kBit/s. But when I calculate the bitrate of the resulting video using mkvinfo -t the bitrate shown sits at 970-1000 kBit/s and that’s not even close to averaging the 1300 kBit/s shown throughout processing. What is causing the disparity ?