thanks everybody! Evilsoup I tried your command and received the following error message:
Am I doing anything wrong?
ffmpeg version 0.8.6-4:0.8.6-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav developers
built on Apr 2 2013 17:02:36 with gcc 4.6.3
*** THIS PROGRAM IS DEPRECATED ***
This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
Unrecognized option 'pattern_type'
Failed to set value 'glob' for option 'pattern_type'