I have a live-action shot of someone holding a gun and fake-shooting. I want to add muzzle flashes with Blender's compositor, so I grab my muzzle flash stock image to overlay onto the shot. How can I make the flash appear at selected points in my shot?
So far the only thing I've found that seems close to this functionality is the Offset option on the Image node when an image sequence is selected, but this just skips frames, it doesn't place the sequence in time.
What I really want to do is decide when a Movie, Image or Image Sequence plays in my composition. How can I do this?