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• Why does an "ffmpeg fail" occur when trying to export frames from my "data_src.mp4" file, while using DeepFaceLab ?

  28 août 2020, par Toby Ryberg

  I've been following this step-by-step videoin installing and using DeepFaceLab on my Macbook Pro, which uses OS Catalina. I've been stuck at the step which begins at the 4:42 mark, where he enters this code :

  


  python main.py videoed extract-video —input-file WORKSPACE/data_src.mp4 —output-dir WORKSPACE/data_src

  


  After entering the command, I'm prompted to enter an FPS value ; no problem. Next, it asks for a file output type, which is where I get tied up— as far as I know. It appears as though I can enter either png or jpeg, but receive the same error message, which looks like this :

  


  / !\ ffmpeg fail, job commandline :['ffmpeg', '-i', '/Users/tobyryberg/Documents/deepfakes/DeepFaceLab/WORKSPACE/data_src.mp4', '-pix_fmt', 'rgb24', '/Users/tobyryberg/Documents/deepfakes/DeepFaceLab/WORKSPACE/data_src/%5d.png']

  


  I have no idea what went wrong, as I BELIEVE that I have been doing everything right thus far. If this is at all necessary information, I've opted to use an 18+ minute long video for my source clip, which is an .mp4 file, without audio. If there's someone out there who has the patience to work with me and figure out what went wrong, I'll be forever grateful !

  


• What are good settings for transcoding videos uploaded to my app ?

  14 mai 2020, par Dmitry Minkovsky

  I am working on an app that allows users to share videos. The problem is that many videos are very high bitrate. For example, A 4-minute H264 video from an old iPhone is encoded at 1080p and runs 17,000 kb/s ( 500 megabytes). Accepting and distributing such videos at this bitrate/resolution is not practical for a social application.

  



  I have been playing with ffmpeg to transcode videos to smaller sizes and higher compression, but have not achieved acceptable results. For example :

  



  ffmpeg \
    -i in.mov \
    -vf scale=w='if(gt(iw\,ih)\,780\,-2)':h='if(gt(iw\,ih)\,-2\,780)' \ 
    -c:v libx264 \
    -crf 28 \
    -preset medium \
    -pix_fmt yuv420p \
    -movflags +faststart \
    out.mp4


  



  This command transcodes the above-mentioned 500MB file down to 70MB. It scales the larger dimension of the video to 780 pixels and compresses the video quite a bit. The results are okay, but the file is still large.

  



  Taking the longer dimension down to 480 pixels, the file is reduced to 40MB. Still quite large, and now significantly degraded. Also, the transcoding still takes quite a long time : about 1-1.5x on my 4 year old i7 Macbook Pro with 16GB RAM.

  



  I'm not sure how to improve on this. H265 is not supported in browsers. I am wondering :

  



  

  • How can I reduce size further ?

  


  • How can I transcode faster than 1x without significantly reducing quality ? Even 2-3x doesn't seem great ?

  


  



  Is this as good as it gets ?

  


• Evolution #4283 (Nouveau) : Mettre en place un raccourcis typo pour lié la page du site dans notre...

  31 janvier 2019

  Bonjour,

  Revisions : zpip est le seul raccourcis typo de SPIP ayant un traitement dérogatoire qui amène directement sur le site référencé au lieu de conduire à la page sur notre site qui affiche la description du site (et le flux RSS syndiqué).

  Je propose donc l’ajout d’un raccourcis supplémentaire qui permettrait de faire le lien avec cette page proprement.

  Depuis plus de 10 ans, j’utilise ce code fournis par ESJ à l’époque (dans un mes_fonctions.php) :
  

  <span class="CodeRay"><span class="comment">/* Permet dans un texte de faire [->refsite12] qui fera un lien vers la page du site en cours décrivant ce site (et non pas un lien direct vers le site de destination) */</span>
  <span class="keyword">function</span> <span class="function">generer_url_refsite</span>(<span class="local-variable">$id</span>, <span class="local-variable">$args</span>, <span class="local-variable">$ancre</span>) {
    <span class="keyword">return</span> <span class="predefined">array</span>(<span class="string"><span class="delimiter">'</span><span class="content">site</span><span class="delimiter">'</span></span>, <span class="local-variable">$id</span>);
  }
  </span>
  Télécharger

  Il suffirait de rajouter ces lignes (avec un _dist pour le nom de la fonction) dans le sites_fonctions.php du plugin pour que ça marche.

  Merci d’avance.