These requirements do change quite frequently.

  apt-get install perl libwww-perl libxml-perl libxml-simple-perl atomicparsley
  
Add this to ''/etc/apt/sources.list'' (for Jessie only):

  deb http://ftp.uk.debian.org/debian jessie-backports main

then

  apt-get update
  apt-get install ffmpeg

and

  crontab -e
  
  min hour day/month month day/week command
  15 0 * * * /usr/bin/local/get_iplayer --pvr --quiet -c 'echo "$(date)    <name> <episode>" >> /home/slack/log/iplayer' 2>> /tmp/get_iplayer.log