I think this is from a TV special I remeber watching roundabout 1977 called "Wings Over the World". It was a great special, as I recall. Too bad it's never been available on video, at least not as far as I know.
For me, I often find the behind the scenes stuff more fascinating than the concert footage.
Another great set of Wings videos on YouTube is a Wings concert from November 1975 in Melbourne, Australia. The concert seemed to be in a very intimate environment, almost like the '72 Europe shows.
Jimmy M is like a man possessed in this performance. Spectacular.
Soily (the first 2+ minutes is just cheering between encores, but it is worth the wait) http://youtube.com/watch?v=DgjOzJVn3SM
Junior's Farm: http://youtube.com/watch?v=awtT5tscgtM
I would love to have this show on DVD. The problem with Macca's recent concert DVD's is the hyperactive editing. I nearly go into a seizure from frenetic editing. It makes them unwatchable, for me. Please, just focus on one thing for more than 1 second.