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wormtongue
05-31-2006, 10:25 AM
hi, guys! any tips on how i can output a CG effect (or what image size i need to render out), when the raw footage was taken using a DVC HDPRO, without having my CG being stretch?

is there any way i can have a final output of 960x720 matching that of the native image size output of DVC HDPRO into a Mac?

someone has said to me that the "real" image size output of the camera is HD 1080. however, when you bring the fooatge into a Mac, the footage will then be converted to 960x720. i tried rendering my CG into 960x720 but when i load it together with the footage my CG render is stretched a liitle bit.

i am thinking of rendering my CG in HD1080 then i'll just downsize it in comp into a 960x720 however i am noticing a color shift (color loss) everytime i do it.

any tips, info or comments is greatly appreciated!

thanks in advance!!! :)
Velk
05-31-2006, 02:45 PM
When you talk about bringing the footage into the Mac I'm guessing you are talking about bringing it into an editing program. What editing program are we talking about?

DV HDPRO is not a true HD format; it down-samples 720p from 1280x720 pixels to 960x720 pixels. So you definitely didn't record anything at 1080.
wormtongue
06-01-2006, 01:36 PM
When you talk about bringing the footage into the Mac I'm guessing you are talking about bringing it into an editing program. What editing program are we talking about?

yes. final cut pro.

DV HDPRO is not a true HD format; it down-samples 720p from 1280x720 pixels to 960x720 pixels. So you definitely didn't record anything at 1080.


thanks for the info. :D
Velk
06-01-2006, 02:31 PM
I think that this may have something to do with using non-square pixels. I'm not sure how Maya handles this (I believe it uses square pixels by default), but the DV codec uses non-square pixels. Thus, your image may look stretched. I'm not in front of FCP and Maya right now so I can't check out this theory—thats what I would check into though.

Here is a link to an Apple doc on Final Cut Pro and non-square pixels http://docs.info.apple.com/article.html?artnum=36836
wormtongue
06-02-2006, 09:06 AM
thanks for the link. and you're right. it has something to do with square and non-square pixels. Maya displays the footage squeezed on the sides that's why the footage appears to be stretched.

my co-workers finally found a way to work with this 'problem.'

what they did was we set Maya's camera to render 960x720 but with a aspect ratio of 1.33 and device aspect aspect ratio of 1.77. althoug the render looked stretch, when you load the render into final cut pro (or AE in Mac for comp) the image is displayed in its true size.

thanks for giving some light into this matter! :)
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