Converion of SWF into images

[pbasubaul]

I want to convert some swf file into static images. I have even
tried to convert the swf files into flv files and then take a snapshot
via ffmpeg to create a thumbnail. But in vain, it is converting swf into
flv, but without any frame to take a snapshot from.

My question is, if anyone has or can refer to some script which can
take a snapshot of swf file and can make an image of that on the fly.
I know of desktop applications which does the work, but those won't
be useful for the bwork I am trying to do. I want to have the task done
on the fly.