Confused? | AJ-HPX2000, true 1080P

[Jeff Regan]

I’m not sure what “true 1080p” is, but the HPX2000 uses native 720p sensors and upscales to 1080. DVCPRO HD does not offer 1080/24P or 30P Native modes, however AVC Intra does offer 1080/24P and 30P Native. Regardless, the HD SDI output is whatever frame rate, progressive or interlace over 59.94i.

Jeff Regan
Shooting Star Video
http://www.ssv.com

[Gary Adcock]

[Jeff Regan] “I’m not sure what “true 1080p” is”

True “p” is just that a signal that is captured and played back as progressive only, no mainstream “video” cameras I know of output 1080 content as anything other than PsF.

1080 by SMPTE default is PsF and only very rarely ever true P on playback (Red and Phantom being the rare exception).

an explanation of PsF is here:
https://forums.creativecow.net/readpost/193/875880

gary adcock
Studio37
HD & Film Consultation
Post and Production Workflows

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https://www.aja.com/kiprotour/

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https://library.creativecow.net/articles/adcock_gary/AJAIOHD.php

[Daniel Elder]

Thanks for the answers Jeff & Gary, yeah I guess I was wondering if the 1080 59.94 to 24P is considered 1080P? or is that still 1080i on the HPX-2000?

Daniel Elder
producer
http://www.luminair.com

[Jeff Regan]

Using System Mode 1080/59.94i, recording in DVCPRO HD, 1080/24p will be 23.98p over 59.94i(2:3), no Native mode available for P2 recording. HD SDI output will be 23.98Psf over 59.94i(2:3). There is also a PA mode for a 2:3:3:2 pulldown.

Using System Mode 1080/23.98Psf recording in AVC Intra, 1080/23.98p will be 23.98p Native for P2 recording. HD SDI output will be 23.98Psf over 47.96i(2:2).

So the key is using AVC Intra 50 or 100 onto P2 cards to achieve full progressive capture, although many would argue that Psf is still progressive after the segmented fields are combined.

Maybe Jan Crittendon or Steve Cooperman from Panasonic can weigh in on this?

Jeff Regan
Shooting Star Video
http://www.ssv.com

[Daniel Elder]

To achieve the AVC Intra I would need to get the AJ-YBX200G board for the camera, correct?

So the 1080 59.94i to 24P or 24PA is achieving what we know as 1080P just through using segmenting the fields, thus removing any of the interlacing that might happen otherwise. The fields are progressive but it is removing any motion between the two segments that are interlaced, so we aren’t as likely to see the interlacing that is going on.

So much information, but it’s very interesting stuff. But at the end of the day, I want to upgrade my HPX-2000 to the AVC Intra board to achieve real progressive scanning vs. the PsF scanning?

Daniel Elder
producer
http://www.luminair.com

[Jeff Regan]

Daniel,

Your understanding is similar to what I believe to be the case. AVC Intra 100 offers a lot of benefits over DVCPRO HD, so that the cost of the option board should be worthwhile. I really like the fact that Native recording is available in 1080p now, besides the 10 bit, full raster image quality benefits.

I’ve used AVC Intra 100 with HPX3000’s and HPM110 P2 Mobile, and it’s a fantastic codec.

Jeff Regan
Shooting Star Video
http://www.ssv.com

[Daniel Elder]

Great to know, we’ll be purchasing that upgrade. Thanks for the insight everyone

Daniel Elder
producer
http://www.luminair.com