https://www.cnet.com/news/what-we-learned-on-avengers-infinity-war-dvd-blu-ray-commentary-marvel-secrets/

Kenneth Branagh, director of the first Thor film, was given the honor of the first lines of Infinity War. On the radio he says, "This is the Asgardian refugee vessel Statesman. We are under assault. I repeat, we are under assault. The engines are dead, life support failing. Requesting aid from any vessel within range. We are 22 jump points out of Asgard. Our crew is made up of Asgardian families. We have very few soldiers here. This is not a warcraft. I repeat, this is not a warcraft." 

"This movie is so jam-packed, you have to use even the opening credits to tell a story," said McFeely.