I need help with fullscreen and stuff with videos

[Flamecannon]

I put this in gallery because I dooo have something to show, http://www.youtube.com/watch?v=NVG_8W2ExXA, but I want it to fit the entire screen. Another video I posted did have full screen while this one didn't! I sadly don't have all the clips originally used in the video. Should I record the video and make it smaller so it can fi on the screen, losing some bits of quality, or is there a better way?

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[GenaralSkar]

Make sure the aspect ratio is set to widescreen for rendering.