Dean-Charles Chapman and George MacKay talk about filming ‘1917’

The two actors who play British soldiers in World War I are being praised for making it look as if the movie was filmed in one continuous shot.
6:07 | 01/22/20

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Transcript for Dean-Charles Chapman and George MacKay talk about filming ‘1917’
me back Welcome back to "Gma." And we are counting down to the oscars. "1917" has ten including best picture following two British soldiers in world War I as they set out to deliver a message that could save hundreds of lives. Please welcome the stars, dean-charles Chapman and George Mackay. Have a seat. Have a seat. Welcome. Welcome. Congratulations on all the success. When Sam Mendes cast movie he said he wanted to cast some virtually unknown actors and with the success of this movie that is far from who you are right now. So how -- How has it been for you guys this whole process? It's been amazing. I mean really it feels like such a long process. We spent six months rehearsing it, 16 weeks shooting it and went through all the press and the movie has come out but it's amazing. As actors, not a lot of actors get the shot to make a film like this. Isn't that a lot of pressure? The whole movie is shot as if it's one continuous movie. A lot of pressure. What happens if you forgot a line, messed up a line? It happens like, you know, sometimes we would get into the end of like a six-minute take and then the last five seconds my rifle would fall off my shoulder or something or you fluff a line and it just happens but everyone knew how much you didn't want it to happen so you all were good to each other when it did. What do you think when that rifle fell? Come on! There's one scene about a five-minute take and slow and George was doing beautiful acting and I had a prop, a map. And there's me wrestling with the map trying to fold it and take ruined. It ended up working out great. Ten Oscar nominations. And for continuity sake in the movie sometimes had you to roll around in the mud and you actually posted a video of it. Heck this out. That looks like fun. Yeah. That could be a new dance move. Yeah. And let's take a look at the end result. We have a picture of the end result of you rolling around in the mud like that which we don't have a picture -- there we go. They got him. My anxiety level just went up watching that clip. Me too. You guys actually rehearsed. Most of it is filmed outside. You said you rehearsed for six months. What does rehearsal look like for a movie like this. Usually with a film, with the edit you can craft the rhythm and pace of stuff muchwards. With this it was like a play. We had to suss all of that out beforehand because it's all one take so you can't chop about the pace afterwards. So we'd go out to these empty locations and basically walk through the scenes to decide upon how we wanted it to be so the set could be built around those specifications. You know, literally putting markers and flags in the ground to be the room needs to finish there. And just so when you watch it, it's all seamless. Like a dance routine. Yeah, pretty much. All of it was genuinely like a choreographed dance between the camera and the actors at all times. Just constant flow and rhythm. You had to do World War I Yes. For this. You two, you need to get to know each other. I heard you took a trip to Belgium together. That's a good way. Yeah, we -- We did. Like we've been to France for the production and so moved by what we'd seen we thought we need to go to Belgium so I picked Dean up in the car at 4:00 in the morning from Essex where he lives and drove to Belgium through the channel tunnel but didn't check if the museums were open so we drove for five hours across the channel and we got there and pull up at the car park which is pretty empty to this one particular museum we wanted to go to. Can you imagine if it was closed. No, of course not. We get to the front door and thank goodness it opens but the woman says, no, no, we're closed in January. So we saw some other sites but that particular museum, we didn't make that one. Doing research for a movie, ma'am, please. It's going to be nominated to are ten oscars. But this movie is fantastic. I was talking to friends about it last night. One said it's one of the guess movies I've seen possibly ever. Wow. Yeah. Loved it. And before I let you guys go, what are you looking most forward to on Oscar Sunday? I really want to meet Robert de Niro. Yeah. Yeah, obviously we've seen him out and about at these events and stuffer but I've never actually shook his hand. Have you been too nervous to go over to him. Yes. I don't blame you. Yeah, but I'm going to give it a go. How about you? I'll be his wing man if I can meet Robert. If I can shake his hand too. That's good for me. Robert de Niro will probably introduce himself to you two at this point. Congratulations to both of you. Fantastic movie. Thank you very much.

This transcript has been automatically generated and may not be 100% accurate.

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