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• ffmpeg - convert movie AND show original input (as a resized picture-in-picture, e.g., bottom-right corner) in the final output file

  3 octobre 2019, par raven

  this is my first post on this forum, so please be gentle in case I accidentally do trip over any forum rules that I would not know of yet :).

  I would like to apply some color-grading to underwater GoPro footage. To quicker gauge the effect of my color settings (trial-and-error, as of yet), would like to see the original input video stream as a PIP (e.g., scaled down to 50% or even 30%), in the bottom-right corner of the converted output movie.

  I have one input movie that is going to be color graded. The PIP should use the original as an input, just a scaled-down version of it.

  I would like to use ffmpeg’s "-filter_complex" option to do the PIP, but all examples I can find on "-filter_complex" would use two already existing movies. Instead, I would like to make the color-corrected stream an on-the-fly input to "-filter_complex", which then renders the PIP.

  Is that doable, all in one go ?

  Both the individual snippets below work fine, I now would like to combine these and skip the creation of an intermediate color-graded TMP output which then gets combined, with the original, in a final PIP creation process.
  Your help combining these two separate steps into one single "-filter_complex" action is greatly appreciated !

  Thanks in advance,
  raven.

  [existing code snippets (M$ batch files)]
  
  
  
  ::declarations/defines::
  
  set "INPUT="
  
  set "TMP="
  
  set "OUTPUT="
  
  set "FFMPG="
  
  set "QU=9" :: quality settings
  
  
  
  set "CONV='"0 -1 0 -1 5 -1 0 -1 0:0 -1 0 -1 5 -1 0 -1 0:0 -1 0 -1 5 -1 
  
  0 -1 0:0 -1 0 -1 5 -1 0 -1 0'"" :: sharpening convolution filter
  
  
  
  ::color-grading part::
  
  %FFMPG% -i %INPUT% -vf convolution=%CONV%,colorbalance=rs=%rs%:gs=%gs%:bs=%bs%:rm=%rm%:gm=%gm%:bm=%bm%:rh=%rh%:gh=%gh%:bh=%bh% -q:v %QU% -codec:v mpeg4 %TMP%
  
  
  
  ::PIP part::
  
  %FFMPG% -i %TMP% -i %INPUT% -filter_complex "[1]scale=iw/3:ih/3 
  
  [pip]; [0][pip] overlay=main_w-overlay_w-10:main_h-overlay_h-10" -q:v 
  
  %QU% -codec:v mpeg4 %OUTPUT%
  
  
  
  [/existing code]

• 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 ?

• 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