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• shell_exec echo'ing too fast or too late

  15 septembre 2016, par root

  So I read throug this article : https://trac.ffmpeg.org/wiki/PHP
  and found this :

  <?php
  
  echo "Starting ffmpeg...\n\n";
  
  echo shell_exec("ffmpeg -i input.avi output.avi >/dev/null 2>/dev/null &");
  
  echo "Done.\n";

  the code works almost perfectly fine, but the only thing that bothers me is, that because the shell_exec is being executed in the background (so there is no loading sign on the tab the whole time) all the echo’s are being executed immediatly. This means, that the "Done" echo is being written before ffmpeg finished its task.

  But when I remove the ’&’ the site does also what it is intended to do but now it waits until the shell_exec is finished until it echo’s out the "Starting ffmpeg..."

  So I kinda have the problem of figuring out how to get to such an order :

  1) echo something
  2) execute commad and wait until its finished.
  3) echo again

  I am a total beginner to php but have experience in programming overall. Please have mercy.

  Thank you for your time !

• Fastest way to generate thumbnails with FFMPEG

  10 mai 2022, par Pit Digger

  FFMPEG takes 9 minutes for generating thumbnails every 15 seconds of a 3 hour long video. What is fastest way to do this ? I have tried following combinations but its taking same time.

  


  ffmpeg -ss 0.0 -t 10800 -i test.mp4 -an -vsync cfr -vf fps=1000/15000 -s 128x72 -f image2 -c:v png -compression_level 100 temp-%010d.png

ffmpeg -i test.mp4 -f image2 -bt 20M -vf fps=1/15 thumbs/tv%03d.png

ffmpeg -i inputvideo.mp4 -vf "select='not(mod(n,450))',setpts='N/(30*TB)'" -f image2 thumbnail%03d.jpg


  


  https://trac.ffmpeg.org/wiki/Create%20a%20thumbnail%20image%20every%20X%20seconds%20of%20the%20video

  


• Stream and control a playlist to RTMP

  20 décembre 2016, par Eight

  I’m currently trying to stream a playlist of files from ffmpeg to an RTMP server.
  I’ve managed to get a single file to be streamed correctly, and (I think) a playlist by using :

  "concat:file1.pm4|file2.mp4|file3.mp4"

  I then tried to use the concatenation method from a txt file they explain here :
  https://trac.ffmpeg.org/wiki/Concatenate

  And was able to get it to work. However I seem to have some problems with controlling it. For example, I have no idea if it is possible to tell ffmpeg to skip this file and play the next one in the list, or to pause the stream at all. I already tested editing the txt file while it is streaming, but that didn’t seem to affect what was already streaming at all.

  Any idea how I can control my stream from the console ? My end goal would be to make the control into a full web interface later, but I’m not even sure if ffmpeg is my best option to do this.

  Any help with ffmpeg or any other options to do this would be greatly appreciated.