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• 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 !

  


• Change audio speed using ffmpeg node js

  26 juillet 2022, par Getwrong

  how do i change the speed of the song output using this function :

  



  function addAudio()
{
      console.log("adding audio...");

      ffmpeg()
      .videoCodec('libx264')
      .format('mp4')
      .outputFormat('mp4')
      .input(song)
      .input(video)
      .output(output1)
      .on('end', () => {                    
          resolve(output1);
      }).on('error', (_err) => {
          reject(_err);
      }).run();
}


  



  https://trac.ffmpeg.org/wiki/How%20to%20speed%20up%20/%20slow%20down%20a%20video

  



  this shows command line input but not sure how to use it in js function ?

  


• 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 ?