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• How can I combine multiple bitmap frames using the ffmpeg library in cpp ?

  20 février 2021, par Evan Pacini

  Ok so I've been making a program in cpp that that a 24-bit (or less) bitmap and through checking its luminance converts it into a 1-bit bitmap, which works totally fine... However I've also been using ffmpeg in my cpp code (through the use of system()) to compile multiple frames with different luminances in order to make a video from it.

  


  //Compile to video
char cmd[168];
std::strcpy(cmd, "ffmpeg -y -framerate ");
std::strcat(cmd, framerate);
std::strcat(cmd, " -i ");
std::strcat(cmd, outFileName);
std::strcat(cmd, "/frm%d.bmp -pix_fmt yuv420p -vf \"pad=ceil(iw/2)*2:ceil(ih/2)*2\" ");
std::strcat(cmd, outFileName);
std::strcat(cmd, ".mp4");
std::system(cmd);


  


  This works fine however as bitmap is uncompressed and the number of frames can get quite large, I've been trying to improve the performance so the program takes less long to run. This is why I want to use the ffmpeg library instead of the executable, which will also make the program more portable, and hopefully, more performant.

  


  However, I find the documentation of the libraries quite intricate and the examples quite limited, as most of them explain how to extract frames from a video while I intend to compile frames into a video...

  


  So does any of you know how to do that ?

  


• How do I install FFMPEG on Heroku for discord.js bot ?

  6 janvier 2018, par Dylan Howes

  I recently put my discord bot onto heroku, and I was going to try out my soundboard commands, but in heroku’s log files it says FFMPEG is not installed. I’ve searched how to do it, and it says something about buildpacks which I’m really confused about. Could someone run me through how I’m suppose to do it, what I’m suppose to go to ? I installed Heroku CLI, I went to cmd.exe, then I did ’heroku login’, typed in my details, and when I tried to do what this guide said : https://github.com/shunjikonishi/heroku-buildpack-ffmpeg it just said its not recognized. I can do "heroku create —buildpack https://github.com/ddollar/heroku-buildpack-multi" and that works and makes an application on heroku im pretty sure, but I have no clue what to do with that. This is my console log below :

  "C :\Users\Dylan>ls .buildpacks
  ’ls’ is not recognized as an internal or external command,
  operable program or batch file.
  C :\Users\Dylan>ls
  ’ls’ is not recognized as an internal or external command,
  operable program or batch file.
  C :\Users\Dylan>cat
  ’cat’ is not recognized as an internal or external command,
  operable program or batch file.
  C :\Users\Dylan>$
  ’$’ is not recognized as an internal or external command,
  operable program or batch file.
  C :\Users\Dylan>$ heroku
  ’$’ is not recognized as an internal or external command,
  operable program or batch file."

  I got heroku like 30minutes ago and have no clue how to do this, so any help would be greatly appreciated. Thank you.

• Anomalie #2683 (Nouveau) : Warning en fin de processus d’install SPIP 3 rc #19335

  1er mai 2012, par Valérie Journet-Girod-Texier-ancêtres

  Juste après avoir choisi une signature, un login et un passe : Warning : Illegal offset type in isset or empty in C :\Program Files\EasyPHP-5.3.3\www\test\ecrire\base\trouver_table.php on line 46 Warning : Illegal offset type in C :\Program Files\EasyPHP-5.3.3\www\test\ecrire\base\trouver_table.php (...)