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• Run script after FFMPEG background task completes (via PHP)

  9 novembre 2018, par Utkanos

  I have a PHP script which triggers an FFMPEG file conversion via shell_exec().

  shell_exec('ffmpeg -i file.webm -c:v libx264 -c:a aac -strict -2 file.mp4 >/dev/null 2>/dev/null &');

  This happens in the background (hence &), i.e. the script completes before conversion has finished.

  Is there a way to call and execute a PHP script (to update a DB flag) once the conversion is complete ?

  I’ve done plenty of Googling but my knowledge of server commands just isn’t up to understanding what I’m reading (e.g. this answer). The best I could manage was to redirect stdout to a file via

  shell_exec('ffmpeg -i file.webm -c:v libx264 -c:a aac -strict -2 file.mp4 > MYFILE.txt 2>/dev/null &');

  ...but obviously that just creates and writes to a file, it doesn’t call and execute it via PHP.

• Configure script for ffmpeg does not find sdl2

  3 avril 2018, par Peter

  Environment :

   Ubuntu 16.04
  
   ffmpeg source code version 3.4.2

  SDL2 installed

  $ pkg-config --exists --print-errors sdl2
  
  $ sdl2-config --cflags
  
  -I/usr/include/SDL2 -D_REENTRANT
  
  $ sdl2-config --libs
  
  -L/usr/lib/x86_64-linux-gnu -lSDL2
  
  $ sdl2-config --version
  
  2.0.4

  Here is part of my configuration shell script :

  PATH="$HOME/bin:$PATH" PKG_CONFIG_PATH="$TARGET_DIR/lib/pkgconfig" ./configure \
  
  --prefix="$TARGET_DIR" \
  
  --pkg-config-flags="--static" \
  
  --enable-sdl2 \

  When I run the script, the error I get is "sdl2 requested but not found."

  What is it that I am missing ? Regards.

• How to convert multiple files from mp4 to flv using a shell script

  22 avril 2013, par jerdiggity

  Assuming I had a bunch of videos sitting inside the directory /home/user/videos/awaiting_conversion how would I go about using cron to run a script similar to this one to batch convert each video into a different format ?

  /bin/sh -c $'nice /usr/bin/ffmpeg -i \044'\'$'/home/user/videos/awaiting_conversion/video_file_1.mp4'\'$' -s \044'\'$'480x320'\'$' -vcodec libx264 -acodec libmp3lame -ab \044'\'$'64k'\'$' -vpre fast -crf \044'\'$'30'\'$' -ar \044'\'$'22050'\'$' -f flv -y \044'\'$'/home/user/videos/converted/video_file_1.flv'\'$''

  The above script works fine for a single conversion, but :

  1. It assumes that the name of the video is static/known (which will not be the case when batch converting).
  2. It assumes that there is only one video to convert (which may or may not be the case), i.e. there's no "loop".
  3. It leaves the original file in place instead of deleting it (which is what I would want to happen to prevent duplicate conversions).

  The ultimate question would be how do I run that script for each video that exists inside /home/user/videos/awaiting_conversion, passing the file name as a variable ?