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1080i vs 1080p

Does 1080p footage take up twice as much storage space on drives as 1080i ?

2 G5s 1.8Ghz single & 2.7Ghz Dual, Mac OS X (10.4.3), 1.5G RAM & 3G RAM, FCP Studio, AJA IO, M-Audio OMNI

Posted on Apr 5, 2006 10:26 AM

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10 replies

Apr 5, 2006 11:11 PM in response to George Chung1

Yes I know that. But since it takes 1080i 1/30th of a second to draw a full frame because it has to do each frame in 2 passes as compared to 1080p which does it in 1 pass taking only 1/60th of a second - does that mean 1080p is drawing 60 frames per second where as 1080i is drawing 30 frames per second.
Meaning that it would take (1080p) twice as much disk space for the same footage ?

Apr 6, 2006 7:56 AM in response to Fritz-Ski

According to the Wikipedia: Due to bandwidth limitations of broadcast frequencies, the ATSC and DVB have standardized only the frame rates of 24, 25, and 30 frames per second (1080p24, 1080p25, 1080p30). 1080p30 is currently the most bandwidth-intensive video mode supported.

The frame resolution (thus storage requirements) of 1080p and 1080i are the same.

Patrick

User uploaded file

Apr 6, 2006 8:07 AM in response to Denny Rambo

I could be wrong on this, maybe someone can confirm or prove me wrong.

There are 30 frames per second, and each frame is made up of 2 fields. So on an older CRT monitor, the electron gun would print the odd fields first, followed by the even fields. So the electron gun would print through the screen twice a second.

I guess it was my understanding that this was the progressive method.

Interlaced would mean that it displays the odd and the even fields at the same time, meaning it only needs to take one pass through the screen.

So where this all boils down to in my mind is that there are still 30fps (or you could shoot 24fps) and all in all, it should (in my theory atleast) be the same file size.

1080i vs 1080p

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