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• sh : ffmpeg : command not found when run command through php

  9 avril 2015, par Ashok

  I have installed successfully installed FFMpeg on root of my Centos 6 machine (https://trac.ffmpeg.org/wiki/CompilationGuide/Centos).

  My workplace of apache/php is /var/www/html

  Now I’m running below command successfully on /var/www/html directory to capture frame from the video file. It’s capturing a frame.

  [root@localhost html]# ffmpeg -i video.mpg -an -ss 30  -t 00:00:01 -r 1 -y -vcodec mjpeg -f mjpeg -s 160x100 frame8  2>&1

  I want to run this command through php and using shell_exec() or exec() php functions. My php code for running the command is :

  $cmd = "/root/bin/ffmpeg -i /project/app/webroot/videos/video.mpg -ss 00:00:14.435 -f image2 -vframes 1 /project/app/webroot/videothumbnails/example-thumb.jpg";
  
  $locale = 'en_IN.UTF-8';
  
  setlocale(LC_ALL, $locale);
  
  putenv('LC_ALL='.$locale);
  
  echo shell_exec($cmd);

  When I’m trying to run command through above php code, I’m getting below error :

  sh: ffmpeg: command not found

  Please help me to solve out this problem.

• Yes or no, will ffmpeg api do hardware decoding on iOS ?

  15 janvier 2019, par Fattie

  There seems to be conflicting information on this.

  https://trac.ffmpeg.org/wiki/HWAccelIntro

  notice the first diagram, it firmly marks iOS as “Y” on VideoToolbox

  

  however in the comments down the bottom it says

  VideoToolbox. ​VideoToolbox, only supported on macOS. H.264 decoding is available in FFmpeg/libavcodec.

  And in the confusing second diagram it says "Standalone" is not done for VideoToolbox.

  We have found that using ffmpeg compiled in to iOS .... it seems to not use hardware decoding, which is really a pain.

  1. With avcodec_get_hw_config() we get AV_PIX_FMT_VIDEOTOOLBOX, AV_HWDEVICE_TYPE_VIDEOTOOLBOX which is seemingly correct.

  2. But usage and framerates clearly shows everything is being done in CPU. The code is in ff_hevc_hls_residual_coding all the time. (That’s fffmpeg’s software decoder.)

  3. This very diff very long git.videolan.org URL here seems to suggest again it should all be working.

  4. Have tried every iPhone etc. of course

• ffmpeg blend multiple files

  7 octobre 2022, par Gregory

  I currently have the following command that allows me to overlay files and apply a blending mode. This works well when I overlay 2 files, however when I try to overlay a third image, then the generated output is incorrect.

  


  

  • Blue

  


  • GroundShadow (softlight)

  


  • FeetShadows (multiply)

  


  


  Command :

  


  ffmpeg \
    -i /Users/me/Downloads/blue.gif \
    -i /Users/me/Downloads/GroundShadow.gif \
    -i /Users/me/Downloads/FeetShadows.gif \
    -y \
    -filter_complex "[0:v][1:v]blend=all_mode='softlight'[v1],[v1][2:v]blend=all_mode='multiply'[v2],[v2]split[s0][s1];[s0]palettegen[p];[s1][p]paletteuse" \
    /Users/me/Downloads/preview.gif


  


  





  


  


  


  


  



  


  


  


  


  Expected (ignore that it's animated)	Result

  


  


  The background color is washed for some reason.
I'm not sure if i'm applying the blending filters in the right order or if you should split between the images to then apply the blend ? Or something else ?