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• is there any functional build of ffmpeg to android

  11 mai 2018, par Rafael Lima

  I’ve searching the last 3 days for a usable API for android access ffmpeg.
  Since FFMpeg group doesn’t release an official lib for android I found several paralel projects trying to build it.

  So it brings me to my nightmare that is called compile.

  i’ve followed all these tutorials : https://trac.ffmpeg.org/wiki/CompilationGuide/Android

  And others found in different places. but none of them build

  NONE OF THEM IS LESS THAN 3 YEARS OLD

  Sorry for the caps, but it is frustrating... no ffmpeg build projects I found deal with nkd above 14 and google doesn’t keep in archive nkds older than that, so even if i agree with get all outdated libraries source i cant reproduce de compiler i cant download the same ndk...

  The only api i manage to download with a functional build of ffmpeg probably was compiled without some codecs, because on my tests i can only handle few types of videos

  ===============================================================

  The question is, does anyone know an actual, stable, project for building ffmpeg to android ?

  I’m even willing to pay in order to get a working version of it

• 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 !