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1080i/24p, 1080p/24p, 1080i/24i, and 1080p/24i, I don't get it

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Joseph Torres
1080i/24p, 1080p/24p, 1080i/24i, and 1080p/24i, I don't get it
on Jun 29, 2010 at 4:00:52 am

First, I thought interlace and progressive only had to do with frame rates, and 2 fields interlacing to make one for interlace, and a full frame for progressive. But then I saw the settings for the HVX, and now i see interlace and progressive for resolutions like 720 and 1080 p and i. I want to know, what is going on?

Like, if its interlace resolution AND frame rate, will it be double interlace? Would it look worse? If only one is interlace, can you tell the difference from the other being interlace?

I really don't understand, can somebody please explain. Thanks.


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Fernando Mol
Re: 1080i/24p, 1080p/24p, 1080i/24i, and 1080p/24i, I don't get it
on Jun 29, 2010 at 6:15:24 am

http://en.wikipedia.org/wiki/Interlace

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gary adcock
Re: 1080i/24p, 1080p/24p, 1080i/24i, and 1080p/24i, I don't get it
on Jun 29, 2010 at 1:02:31 pm

[Joseph Torres] "I really don't understand, can somebody please explain. Thanks."

do a search here and on google for "Progressive segmented frame" ....



gary adcock
Studio37

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Production and Post Stereographer
Technology Development
Quality Assurance Assistance

Chicago, IL

http://blogs.creativecow.net/24640



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Michael Sacci
Re: 1080i/24p, 1080p/24p, 1080i/24i, and 1080p/24i, I don't get it
on Jun 29, 2010 at 9:39:15 pm

You will never see 24i, 24 is always a progressive frame. On cameras like the HVX it is listed as 1080i/24p, which means the progressive is broken in half (segmented) and sent as 48 half frames. Don't confuse a half of a progressive frame with an interlaced field. With interlaced fields, 2 of them do not make a progressive frame. Each field is taken at a different time.


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Noah Kadner
Re: 1080i/24p, 1080p/24p, 1080i/24i, and 1080p/24i, I don't get it
on Jun 29, 2010 at 11:09:24 pm

Yeah don't make up confusing terms like "24i", the real ones are confusing enough already. :)

Noah

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Jeremy Garchow
Re: 1080i/24p, 1080p/24p, 1080i/24i, and 1080p/24i, I don't get it
on Jun 30, 2010 at 5:51:19 pm

[Michael Sacci] "On cameras like the HVX it is listed as 1080i/24p, which means the progressive is broken in half (segmented) and sent as 48 half frames. "

Not on the HVX or HPX170. This is really 24p with pulldown (which makes it more confusing as the frame rate is 29.97). DVCPro HD cannot be recorded as 1080pN24, meaning you have to record it as 29.97 so the 24p material has pulldown when recorded. Confused yet?

AVC Intra, though, doesn't have this problem and can be recorded 1080pN24 (or 1080psf23.976) straight to the P2 card.


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Joseph Torres
Re: 1080i/24p, 1080p/24p, 1080i/24i, and 1080p/24i, I don't get it
on Jun 30, 2010 at 8:57:09 pm

Thats so much everybody! So basically what you guys are saying is that 1080i 24p is not interlace what so ever and will be 100% progressive when edited and all that, correct?


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Joseph Torres
Re: 1080i/24p, 1080p/24p, 1080i/24i, and 1080p/24i, I don't get it
on Jun 30, 2010 at 8:57:29 pm

Thanks so much everybody! So basically what you guys are saying is that 1080i 24p is not interlace what so ever and will be 100% progressive when edited and all that, correct?


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Jeremy Garchow
Re: 1080i/24p, 1080p/24p, 1080i/24i, and 1080p/24i, I don't get it
on Jun 30, 2010 at 10:21:53 pm

That's not what I'm saying at all. 24p with 3:2 pulldown is inherently interlaced. 3 progressive frames followed by two interlaced frames.


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gary adcock
Re: 1080i/24p, 1080p/24p, 1080i/24i, and 1080p/24i, I don't get it
on Jul 1, 2010 at 12:27:53 am

It's called a "progressive segmented frame" NLE's like PPRo, MC and FCP handle the file as a progressive stream, but the transport and delivery is as interlace. It is the same process as is used when projecting motion picture film in a theatre and all 1080 HD content for broadcast is handled in this manner.

Yes it is confusing, one simple rule is only 720 is true P all the time, 1080 is all of the above.

gary adcock
Studio37

Post and Production Workflow Consultant
Production and Post Stereographer
Technology Development
Quality Assurance Assistance

Chicago, IL

http://blogs.creativecow.net/24640



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Michael Sacci
Re: 1080i/24p, 1080p/24p, 1080i/24i, and 1080p/24i, I don't get it
on Jul 4, 2010 at 12:00:02 am

Yeah I explained it wrong, I was talking about the image at the sensor and then removing the pulldown when transferring the footage into FCP. And I should have referred to 1080i/24pA.

The main point I thought I was making is there is no 24i as in 48 fields that have a different timing between field A and B.

Man this is confusing even if you think you understand it.


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