Original video 1280x720. It's too big to have on phone so I cut it down to about 10 seconds and rendered it as 1920x1080. But the video is so tiny on my phone, it doesn't want to take up the whole screen, which it definitely should with 1920x1080 resolution.
As you can see it's a black frame around the video and the video is way way too small. Why is this?