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• Revision 87136 : Suite au message de nico du 15-01-2015 ...

  18 janvier 2015, par spip.franck@… — Log

  Suite au message de nico du 15-01-2015 ​http://archives.rezo.net/archives/spip-zone.mbox/2015/01/
  j’ai fait un up de version aux plug qui en avaient besoin, parfois, il y avait des différence entre paquet et plugins.xml, et d’autres broutilles

• Revision 87136 : Suite au message de nico du 15-01-2015 ...

  18 janvier 2015, par spip.franck@… — Log

  Suite au message de nico du 15-01-2015 ​http://archives.rezo.net/archives/spip-zone.mbox/2015/01/
  j’ai fait un up de version aux plug qui en avaient besoin, parfois, il y avait des différence entre paquet et plugins.xml, et d’autres broutilles

• Odd X server error with ffmpeg

  4 novembre 2013, par jhc

  I am building a weather data acquisition system. One of the things I would like to do would be to animate the satellite data that is arriving every 15 minutes. In fact, I have already devised a script (called animate) that successfully joins eight hours worth of PNG images into an AVI video file. This runs fine when run manually from the terminal.

  Unfortunately, the same cannot be said when run from my (as in my user, not root) crontab.

  Below is the cron job that I mentioned :

  1,16,31,46 * * * * /home/daniella/bin/anim_all > /home/daniella/logs/anim_all.log 2>&1

  anim_all simply calls animate for each distinct data product :

  #!/bin/bash
  
  set -x
  
  cd /home/daniella/data/imager
  
  
  
  rm -rf HRIT_MSG3_*.avi
  
  
  
  animate HRIT_MSG3_CTT
  
  animate HRIT_MSG3_IR108
  
  animate HRIT_MSG3_VIS006
  
  animate HRIT_MSG3_WV062

  And animate itself calls ffmpeg.

  #!/bin/bash
  
  
  
  set -x
  
  cd /home/daniella/data/imager
  
  product=$1
  
  hl="$product.8hl"
  
  
  
  declare -i i=0
  
  for file in $(cat $hl); do
  
      link=$(printf "images%02d.png" $i)
  
      ln -sf $file $link
  
      i=$((i+1))
  
      echo $i
  
  done
  
  
  
  ffmpeg -sameq -r 15 -i images%02d.png $product.avi
  
  rm -rf images*.png

  Just to be clear, the .8hl file is simply a list of PNG file paths that refer to that last 8 hours of data. Since there is new data every 15 minutes, that is a text file with 32 lines. Finally, this is the error that is returned when examining anim_all.log (referred in the crontab) file.

  + animate HRIT_MSG3_CTT
  
  animate: unable to open X server `' @ animate.c/AnimateImageCommand/365.
  
  + animate HRIT_MSG3_IR108
  
  animate: unable to open X server `' @ animate.c/AnimateImageCommand/365.
  
  + animate HRIT_MSG3_VIS006
  
  animate: unable to open X server `' @ animate.c/AnimateImageCommand/365.
  
  + animate HRIT_MSG3_WV062
  
  animate: unable to open X server `' @ animate.c/AnimateImageCommand/365.

  Please note that anim_all works fine, when called manually from the terminal. This error exists only when called by cron. I would imagine that this has to do with environment variables, but I have sourced my .bashrc inside the script to no prevail.

  EDIT -
  Investigating the animate.c file itself (see the full code here), at lines 365-368, there is this :

  if (display == (Display *) NULL)
  
      ThrowAnimateException(XServerError,"UnableToOpenXServer",
  
      XDisplayName(server_name));
  
  (void) XSetErrorHandler(XError);

  In response, I have attempted to export the $DISPLAY variable to 127.0.0.0:0 in the animate script, but this has not worked.