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What does 1080i mean? What is the difference between 1080p and 1080i?

asked May 14 '12 at 12:13

Studio66Designs's gravatar image

Studio66Designs
405212222228

Questions like this should be asked often.

(May 14 '12 at 17:44) AlwaysLearningTech AlwaysLearningTech's gravatar image

P stands for Progressive. I stands for Interlaced.

1080p is 29.97 frames every second. 1080i is 59.94 fields every second. There are two fields, an upper and a lower. Each field is half of a frame, containing every other line of the frame.

alt text

The problem with recording interlaced is that when something is moving, two fields that are supposed to line up will be offset. The camera will read the first field, then something moves, and the next field will be different:

alt text

So 1080i is basically 1080p, but with motion issues. I never shoot interlaced, progressive is the way to go. Interlacing was needed years ago when they didn't have enough power to get enough progressive frames per second, but it's pretty much useless now. I don't know why it's still used. So when you have a choice, choose 1080p. You can read more into it but that's it in a nutshell.

answered May 14 '12 at 15:47

sfrancis928's gravatar image

sfrancis928
2.7k354682

I think you've explained this pretty well (even though I already know what the difference is).

(May 14 '12 at 15:55) catchatyou catchatyou's gravatar image

Thanks a lot!

(May 14 '12 at 23:43) sfrancis928 sfrancis928's gravatar image

interlace causes issues sometimes with apocryphal/artifactual lines in the editing programs. i would avoid it.

(May 15 '12 at 03:23) conspiritech conspiritech's gravatar image

In video there are lines of pixels.

P is refreshing from top to bottom.

I is every other line being refreshed top to bottom.

answered May 14 '12 at 12:19

Jackster1337's gravatar image

Jackster1337
8.5k185218303

So what will the difference be if I upload a video in 1080i to YouTube instead of 1080p?

(May 14 '12 at 12:22) Studio66Designs Studio66Designs's gravatar image

It is just how the image is shown. YouTube converts to P

(May 14 '12 at 12:24) Jackster1337 Jackster1337's gravatar image

But why is there an option on Sony Vegas for 1080i? I don't understand if YouTube just converts it to 1080p?

(May 14 '12 at 13:22) Studio66Designs Studio66Designs's gravatar image

Sony Vegas is not just for YouTube...

(May 14 '12 at 14:14) Jackster1337 Jackster1337's gravatar image

answered May 14 '12 at 14:30

nitrocrime's gravatar image

nitrocrime
3.7k7283132

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Asked: May 14 '12 at 12:13

Seen: 4,562 times

Last updated: May 15 '12 at 03:23