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• Replace video with jpg in ffmpeg

  14 septembre 2020, par ben158

  I am trying to convert an mkv with video and audio into an m4v with the same audio, but with the video replaced with a still jpg for the duration. I'm following the examples from https://trac.ffmpeg.org/wiki/Slideshow and not having any success. Every time I attempt any of these, it doesn't insert the jpg, and instead uses the original video from the mkv. I am testing the files in VLC. Any ideas what could be going wrong ? I'm inclined to think the documentation itself may be outdated or wrong.

  


  Attempts following the linked examples :

  


  -i input.mkv -loop 1 -i image.jpg -c:a ac3 -b:a 640K -c:v libx264 -shortest output.m4v

-i input.mkv -framerate 1 -i image.jpg -c:a ac3 -b:a 640K -c:v libx264 -r 30 -pix_fmt yuv420p output.m4v

-i input.mkv -framerate 1 -i image.jpg -c:a ac3 -b:a 640K -c:v libx264 -r 30 -vf format=yuv420p output.m4v


  


  The one thing I got semi-working (based on code from another source) was -i input.mkv -i image.jpg -filter_complex "[1][0]scale2ref[i][v];[v][i]overlay" -c:a ac3 -b:a 640K -c:v libx264 output.m4v but this stretches the image out (which I don't want, I want the resultant video to have the same aspect ratio as the image without black padding on the sides).

  


  I'm kicking myself because I eventually got something along the lines of the first examples working a few days ago, but somehow didn't save my work and am back to square one. Any help is appreciated, thanks in advance.

  


• Anomalie #3988 : meta cache_signature trop restrictive

  4 septembre 2017, par Emmanuel Dreyfus

  cedric - a écrit :

  Le cas qui peut être problématique est celui de la base répliquée
  entre plusieurs serveurs, mais là on entre dans un autre sujet et
  pour qu’il y ait collision cela supposerait que le dossier tmp/cache
  est commun aux serveurs.

  On se heurte au problème dans ce contexte, mais chaque serveur
  a son dossier cache. La base de donnée est partagée, sauf certaines
  tables qui restent locales (jobs ; syndic, urls, transactions, visites, referers).

  Comme chaque machine a son cache, elle tente d’écrire la meta cache_signature avec une valeur qui rentre en conflit avec celle des autres, d’où l’idée d’avoir un nom de meta différente pour chaque cache.

• How do I confirm if a php shell_exec was completed

  21 juillet 2015, par iamthestreets

  I am running a php script using the cPanel Cron Jobs. The script is using shell_exec to convert a video using ffmpeg. It executes the script and everything is working but it is not sending me the email. I am basically trying to get the output of the shell_exec to start another function in the php script so I wanted to send my self the email to make sure I am getting the output.

  For example I wrote :

  $command = "ffmpeg -i $og_video -b 1500k -vcodec libx264 -vpre slow -vpre baseline -g 30 $mp4_video";
  
  
  
  //EXECUTE THE CONVERSION
  
  $output = shell_exec($command);
  
  echo $output;

  I also tested the email by removing the shell_exec and just echo the $command variable. This will send me the full string in an email.

  What I am trying to accomplish is basically if the shell_exec executed then do something else.

  How do I check if the shell_exec was completed ?