It's a 5 minute buffer with a voice command to automatically store the last 30 seconds of gameplay without jumping into a menu.So wait, how does the game dvr thing work.
For PS4- Captures your last 15 minutes of gameplay.
For Xbox- Captures 5 minutes? I genuinely don't know. I keep hearing 30 seconds thrown around.
"So the idea is that you're always recording. We have a ring buffer game DVR basically, so the last five minutes of any game you're playing is always being stored locally on your hard drive," Ken Lobb, creative director at Microsoft said tp CVG.
"Let me give you two scenarios. Scenario one: I'm playing online and I just did the best thing ever. I can't pause [because] I'm playing online. You can say 'Xbox, record that', it'll grab the last 30 seconds and save it for you to play with later."
"So now let's say you're not playing online and you do the best combo or you have the best fight ever," Lobb continued. "You can finish after that fight, that thing you just did is within the last five minutes, you can go into that last five minutes and scrub it for the best stuff - I want that four seconds and this ten seconds and this 30 seconds and then I want that ultra combo."
http://global.christianpost.com/news/ps4-vs-xbox-one-which-game-dvr-features-are-better-101878/
PS4 also has trim commands done via controller input, but I don't think they've shown off the ability to splice different clips together.