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• Evolution #4256 (Nouveau) : Faire un signalement des mise à jour de sécu

  24 décembre 2018, par Franck D

  Hello :-)
  Quand un plug reçoit une mise à jour de sécu, l’utilisateur ne le sait pas, car, il n’y a pas de différence "d’affichage" entre une mise à jour de secu et une mise à jour "classique" !
  Résultat, les gens ne font pas forcément la mise à jour, car, il n’y a rien de "percutant" comme info !
  Cela va un peu avec https://core.spip.net/issues/3509 et https://core.spip.net/issues/3017, mais pas complètement non plus, car il ne faudrait même pas y avoir de besoin de lire les logs pour savoir qu’il y a une correction de secu.

  Il faudrait que quand SVP détecte une mise à jour de secu, l’arrière-plan du plug en question sur cette page /ecrire/ ?exec=admin_plugin devienne "rouge" par exemple, voir que le webmestre et les admi reçoivent l’info d’une façon ou d’une autre sans devoir aller sur cette page (mail, popup à la page d’accueil, autre ???)

  Je me demande s’il ne nous manque pas un fichier du type archivelist_secu.txt sur la zone ou SVP regarderait les plugins qui sont dedans avec leur version, nous aurions un affichage du type :
  Nom_du_prefix_du_plugin/Version_du_X_qui_contient_le_problème/Version_du_plugin_sans_problème

  Ce qui donnerait par exemple :
  saisie / version 1.x.x / 1.42.11
  saisie / version 2.x.x / 2.28.0
  saisie / version 3.x.x / 3.11.1
  Franck

• website performance issues when using ffmpeg on separate server

  10 décembre 2018, par Rich

  I am currently working on a site that uses wordpress and ffmpeg. I have it setup so that I have 3 servers - main, database, ffmpeg. So far I have it all working, however I am still running into issues when I am trying to encode a video.

  Whenever I start encoding a video, if I try opening any other links in a new tab, it gets stuck on loading until ffmpeg is done. I dont understand why, since im using multiple servers.

  My specs for my servers —

  Main (web server) - 4 vCPUs / 8GB RAM / 160GB Disk

  Database server - 2 vCPUs / 4GB RAM / 80GB Disk

  Ffmpeg server - 8 vCPUs / 32GB / 640GB Disk

  They are all in the same region as well, and I have private IPs as public for them. Public IPs uses IPv4.

  On my template page I have a form that the users fills out and uploads images, then using ajax it sends the info to my ffmpeg functions in my functions.php file.

  Images are uploaded to the main server and then on that server in my functions.php file I use ssh2 to login to the ffmpeg server and run different commands, for example —

  $server   = "FFMPEG SERVER IP"; // server IP/hostname of the SSH server
  
  $username = "user"; // username for the user you are connecting as on the SSH server
  
  $password = "pass"; // password for the user you are connecting as on the SSH server
  
  // Establish a connection to the SSH Server. Port is the second param.
  
  $connection = ssh2_connect($server, 22);
  
  // Authenticate with the SSH server
  
  ssh2_auth_password($connection, $username, $password);
  
  $sftp = ssh2_sftp($connection);
  
  ssh2_sftp_mkdir($sftp, $thepathw);
  
  
  
  $command = '/usr/local/bin/ffmpeg -threads 1 -i '.$thepath .'/audio.mp3 -safe 0 -f concat -i '.$thepath.'/paths.txt -vf "scale=1280:720,setsar=1" -pix_fmt yuv420p -c:a aac -af "volume=-5dB" -c:v libx264 -movflags +faststart '.$fixedtime.' -y '.$output.' 2>&1';
  
  
  
  // Execute a command on the connected server and capture the response
  
  $stream = ssh2_exec($connection, $command);
  
  // Sets blocking mode on the stream
  
  stream_set_blocking($stream, true);
  
  // Get the response of the executed command in a human readable form
  
  $output1 = stream_get_contents($stream);
  
  // echo output
  
  echo $output1;

  The video file that is created is then saved to the ffmpeg server.

  This all works as should and Im able to create videos, but the rest of the site doesnt seem to respond/load until ffmpeg is done. This is a big problem since I plan on having multiple users at once on the site.

  So how can I improve this setup so that the ffmpeg server doesnt slow down the main server, and multiple users can safely use the site ?

  Im also open to the idea of getting another server to upload my images to, instead of on the main. Im not sure if that would help though cause it seems like a lot of pulling/sending data between multiple sources/IPs may slow down the response time.

  Any suggestions is appreciated, thanks.

• Use ffmpeg to compile RGBA image sequence into two separate videos (RGB + Alpha)

  27 novembre 2018, par MirceaKitsune

  I plan on using Blender to render animated sequences for a game. I need the videos to have transparent backgrounds in the format expected by its engine. This format involves the transparency being defined as a separate grayscale video of equal FPS and duration. Since splitting the RGB and Alpha channels in Blender is more complicated, I’d prefer doing this directly from ffmpeg.

  The input directory contains an image sequence of png files in RGBA format (eg : 0000.png to 0100.png). What I need ffmpeg to do is compile them into two separate videos : One containing only the RGB channels (leave transparency black) and another containing only the grayscale alpha channel. In the end I’d have something like my_video.mp4 + my_video_mask.mp4.

  I’m familiar with compiling non-transparent image sequences into video using :

  ffmpeg -f image2 -i /path/to/sequence/%04d.png output.mp4

  But I don’t know how to extract the alpha channel and make it a separate video file. What is the simplest ffmpeg command to achieve this result ?