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1080P vs 1080psF

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Duke Bishop
1080P vs 1080psF
on May 13, 2010 at 5:48:11 pm

Is there a difference if I capture using 1080P or 1080psF easy setups?

What if I capture using 1080psF, but export using a sequence preset of 1080P?

The sequence presets for ProRes HQ 1080psF or 1080P appear identical, and of course in Quicktime they both say only 23.98.


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Aaron Neitz
Re: 1080P vs 1080psF
on May 13, 2010 at 5:57:04 pm

Progressive Segmented Frame. Machine splits the image into 2 fields to transport it. Monitor or computer on the receiving end recognizes the 2 fields and reassembles the imagine as truly progressive before displaying it. Was designed to help alleviate the bandwidth/timing problems of 1080p - I believe it also facilitates conversion to other formats much simpler?

Anyhow, rule of thumb is always use Psf. It's still progressive in your computer, no worries.


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Duke Bishop
Re: 1080P vs 1080psF
on May 13, 2010 at 11:23:30 pm

I understand what psf is, I am asking if there is a difference for the sequence presets, or if you can capture something that is 23.98 in either P, or psf format. Also, the rule of thumb doesn't apply here, because someone is asking me to do 23.98P instead of psf. Which is why I'm asking the questions in the first place.


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Aaron Neitz
Re: 1080P vs 1080psF
on May 13, 2010 at 11:38:04 pm

Excuse me for misreading.



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Carsten Orlt
Re: 1080P vs 1080psF
on May 13, 2010 at 11:35:06 pm

the difference in the sequence setting relates to any effects, speed changes or transitions you apply.
in a psf sequence they will be rendered as interlaced. in progressive they will be rendered as full frames.

capture doesn't really make a difference as you can set the field dominance of a psf clip to none which makes it progressive.


Carsten


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Duke Bishop
Re: 1080P vs 1080psF
on May 13, 2010 at 11:36:56 pm

That's perfect, thanks for the info.


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Michael Gissing
Re: 1080P vs 1080psF
on May 15, 2010 at 12:07:18 am


If you are playing out the final to HDCam then psf is best as that is what records on tape. If it is for broadcast, again psf is best.

As Carsten said, you can always make psf into p so unless you are not making a broadcast deliverable, I would stay psf all the way through.


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Marc Poliquin
Re: 1080P vs 1080psF
on May 17, 2010 at 2:51:13 pm

Hi:

I just created a post asking pretty much this same thing, and then I noticed this thread.

Are you saying that psf is best even if you're not laying back to HDCAM? Why?

Cheers,

Marc


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gary adcock
Re: 1080P vs 1080psF
on May 18, 2010 at 11:38:20 am

[Marc Poliquin] "Are you saying that psf is best even if you're not laying back to HDCAM? Why? "

because all broadcast signals are designed to be interlaced for transmission.


There is NO difference in the images, only in the manner that the image is transmitted and displayed.


gary adcock
Studio37
HD & Film Consultation
Post and Production Workflows for the Digitally Inclined
Chicago, IL

http://blogs.creativecow.net/24640



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