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• FFmpeg os.system commands not working but work in Terminal

  28 janvier 2020, par Oscar Dolloway

  I’ve downloaded ffmpeg through the website and ran some commands through the terminal to confirm its install.

  when running the command ’ffmpeg’ in the Terminal it returns

   ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg 
  
   developers
  
   built with Apple LLVM version 10.0.0 (clang-1000.11.45.5)

  if i type into Python

  import os
  
  os.system ('ffmpeg')

  it returns

   os.system ('ffmpeg')
  
   sh: ffmpeg: command not found
  
   Out[25]: 32512

  any ideas ?

  Solution :

   ffmpeg = '/bin/ffmpeg' #path to the binary file
  
  
  
   os.system(ffmpeg)

  Output :

  os.system (ffmpeg)
  
  ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developers
  
  built with Apple LLVM version 10.0.0 (clang-1000.11.45.5)

• ffmpeg.so in PHP exec converting and no return

  13 juin 2015, par Tom

  I have seen many threads, but none working ones, so this is my issue :

  I have server installed ffmpeg (ffmpeg-php version 0.7.0, PHP Version 5.4.41) Linux CentOS 6 64bit :

  Using PHP :

  exec('/usr/lib64/php/modules/ffmpeg.so -i test.mp4 testdone.avi',$out,$ret);

  or

  exec('/usr/lib64/php/modules/ffmpeg.so -i /var/www/html/test.mp4 /var/www/html/testdone.avi',$out,$ret);

  or

  exec('/usr/lib64/php/modules/ffmpeg.so -i /var/www/html/test.mp4 /var/www/html/testdone.avi'.' 2>&1',$out,$ret);  

  the ffmpeg is actually found, but always returns : array(0) { } int(11) and with 2>&1 returns array(0) { } int(139) and does not return anything else like testdone.avi in the directory or -version (in the directory). Directories /var/www/html/ are set to 777.

  Thank you, should I hire someone to fix this or am I missing something in PHP.

• Non-optimal video scaling using ffmpeg

  11 septembre 2018, par Question

  I’m using ffmpeg, calling it via python, essentially I do :

  file = "c:/video/video.mp4"
  
  hd = 'ffmpeg -y -i % s -crf 23 -preset fast -c: a copy verifast480_output.mp4'% file
  
  os.system (hd)

  The aim would be to make a good video resize for minor quality, such as a video from 720p to 480p.

  But in rehearsing I thought of turning a 720p video into another one of the same size, to see how it was getting better or worse.

  Here are the problems encountered :
  The resulting videos are larger than the original( For example, a file of 220 Mb then becomes 250 Mb at the end of the transformation ), and sometimes even longer than a few seconds( if the video lasts 22:15 at the end of the transformation it becomes 22:22 ).

  For example this command is not as written in the documentation :
  "-crf" possible values 0-51, but if I put "-crf 0" (means no loss of quality) the video from 250 Mb becomes over 1 Gb, only with this option.

  What interested me was a way to preserve the original appearance as much as possible.