APPLE FINAL CUT PRO:

DVCPRO HD - what are native frame dimensions?


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DVCPRO HD - what are native frame dimensions?
by Max Chernyaev on Aug 12, 2008 at 10:00:21 pm

Hi! My question is about math actually. We all know that native size of a 720p frame is 1280x720 considering pixels are square. We also know that DVCPROHD stores frames as 960x720.
But if we open a DVCPROHD .mov file QuickTime will display it as 1248x702 meaning these dimensions are correct to display DVCPROHD's frame. So can anybode tell me *what dimensions are really correct*?
I need dimensions of the source frame to calculate correct downscaling proportions to make a PAL 4:3 movie from DVCPROHD 720p, using only one Shake node (Resize) instead of simple combination of two: Fit and Resize; trying to optimize
Another thing that we have to take in count when doing such conversion is that PAL 4:3 720x576 frame have 1.066 pixel aspect.
So, any ideas?

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Re: DVCPRO HD - what are native frame dimensions?
by Jeremy Garchow on Aug 12, 2008 at 10:31:23 pm

In 720p:

Native DVCPRo HD is 960x720 with a PAR of 1.33.

When displayed on a monitor that image is stretched to 1280x720 with a square PAR of 16:9 (or 1.78).

QT is obviously scaling the image. 720p base band is 1280x720 by it's very design.

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Re: DVCPRO HD - what are native frame dimensions?
by Max Chernyaev on Aug 13, 2008 at 11:46:38 am

I was absolutely sure in that until saw QT "info" box.
Guess that's just QT's bug

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Re: DVCPRO HD - what are native frame dimensions?
by Jeremy Garchow on Aug 13, 2008 at 2:38:42 pm

[Max Chernyaev] "Guess that's just QT's bug"

It does sometimes have a few reporting errors.

Jeremy

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