trying to get a raspberry pi to read QR codes from a webcam.

im using zbar tools

sudo apt-get zbar-tools

zbarcam /dev/video0


This works just fine in ubuntu

but im getting errors on the rpi im running weezy

 ERROR: zbar processor in zbar_processor_init():
     unsupported request: no compatible image format



anyone work with the pi to do this before? surprised im not finding more tutorials going over this online.

what ive found
http://www.raspberrypi.org/phpBB3//viewtopic.php?f=41&t=16025