This may be an alternative.
http://www.ros.org/wiki/rosbag/Tutorials/Exporting%20image%20and%20video
%20data

On Sat, 2010-06-26 at 11:45 -0400, Andrew Harris wrote: 
> Hi -
> 
>    I'm having troubles finding bag_to_images.  I'm not sure what
> Caroline means when she says it's in the sandbox.  I tried looking
> here, but I don't seem to see it:
> 
> https://code.ros.org/svn/wg-ros-pkg/trunk/stacks/
> 
> On Mon, May 31, 2010 at 3:19 AM, Caroline Pantofaru
> <pantofaru@willowgarage.com> wrote:
> > Try the bag_to_images package in the sandbox.
> >
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