Metropol

Where is the "video below" that you mentioned twice, Mark?

Isn't there a ripple effect in your NLE? Premier Pro gives at least a liquid ripple effect. You could animate a layer (of your St George Cross) with transparency over your BG video.

You could add a zoom + rotation to the layer to make it slightly more like a flag in motion.

A crude suggestion, but my best, cheap thought.

Ohhhh - do you want to add the fluttering flag in as if it were present in the shot?

My suggestion is void in that case.

There's a concentric circle dealy in the Video Effects > GPU Effects menu.

EDIT: You found it!

You can do some offsetting of the surface angle it is viewed at and where the centre of the concentric circles begin.

I would render it out before attempting any zoom/motion effects to keep it manageable. Perhaps you could set the background of it to a good keyable green to aid in the layering process.

A quick and dirty illustration...

http://www.gorillaenterprises.co.uk/upl ... s/flag.jpg