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• FFMPEG execution from PHP

  13 juin 2014, par egekhter

  I’m trying to execute FFMPEG from a PHP script and could not figure out the best practice for doing so when running a background process - do we use shell_exec, exec, passthru, proc_open...?

  On https://trac.ffmpeg.org/wiki/Using%20FFmpeg%20from%20PHP%20scripts, they use an example of

  echo shell_exec("ffmpeg -y -i input.avi output.avi null >/dev/null 2>/var/log/ffmpeg.log &");

  In my code I was initially using :

  exec($cmd." 2>&1", $out, $ret);

  But then switched to :

  passthru($cmd." 2>&1", $ret);

  I chose passthru because I could actually see the encoding process in terminal, but now it’s a moot point since I’m running multiple background processes. Which is the recommended function for running background processes ?

• Problem with processing FFMPEG video , the output video is totally black in first 3 seconds

  13 janvier 2021, par Trần Minh Tuấn

  I want to make a slideshow by using concat demuxer like this link :
https://trac.ffmpeg.org/wiki/Slideshow

  


  Here is the textfile preinputFiles.txt :

  


  file 'path a'
duration 2
file 'path b'
duration 2
file 'path c'
duration 2
file 'path c'


  


  and my command array is :

  


  String[] cmd = new String[]{
            "-f","concat","-i",
            textFile,
            "-vsync", "vfr", "-pix_fmt", "yuv420p",
            dest.getAbsolutePath()};


  


  the video has 3 seconds that it is totally black and run from 3s to 9s even the gallery shows that it is a 6 seconds long video .

  


  Thanks for the help !

  


• ffmpeg x11grab inputting improperly

  20 décembre 2017, par Not a superuser

  I have the stock ffmpeg install from the xbps repository. I’ve used it before, but am on a new system.

  Running "ffmpeg x11grab -video_size 1280x800 -framerate 60 -i $DISPLAY output.mkv" yeilds no errors, but when I watch the video it is a mess switching between workspaces and with only partly rendered programs.

  Taking other inputs such as webcam work fine, and different encoding methods don’t change anything (though webm flat out doesn’t work, but that’s not a problem for me).

  I’ve tried what’s here : https://wiki.archlinux.org/index.php/FFmpeg

  Only other thing to note is that I use i3 as a dm, which shouldn’t be a problem, but figured I’d state it just in case.

  EDIT :
  I was using compton for composite, and that was where my issue lied...
  https://github.com/chjj/compton/issues/381

  Thanks !