I saw this on Twitter and I was curious where it came from. It doesn't match any movie footage I know of. It may be from the Holiday Special.
Giphy, which specializes in animated gifs, has this tagged as coming from the Star Wars Holiday Special.
Thanks to @user13267 for providing link and location, we can see the scene from that movie where the gif/mp4 was taken, a little before 15 minutes in.