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• bash script to start/stop ffmpeg x11grab

  28 juin 2012, par lunacafu

  A application is storing its status in a file on the server /temp/status.txt. There are 4 status possible : wait, ready, recording, finished. With a cronjob I would like to start a shell script that checks this file and take action as follows :

  • wait -> do nothing
  • ready -> execute ffmpeg -f x11grab -s cif -r 25 -i :0.0 /tmp/out.mpg. Now while ffmpeg captures, the status.txt file still has to be checked for a change to the status,
  • recording -> do nothing
  • finished -> send q command to ffmpeg process to quit capturing process and finish script.

  I tried to solve it with expect and xdotool to realize that this absolutely the wrong way. My problem is that I acutally have no experience in bash and handling processes, child processes etc.