Re: Pixel Aspect on input vs. temporal
Re: Pixel Aspect on input vs. temporal
- Subject: Re: Pixel Aspect on input vs. temporal
- From: Paul Schneider <email@hidden>
- Date: Fri, 7 Nov 2008 16:56:00 -0600
Hi Stoney,
I don't see that behavior in a quick test, but my DV media is 720 x
480, not 486. 720 x 480 is FCP's idea of "standard" NTSC DV, and what
you get when you create a sequence with the NTSC DV preset.
It sounds like you're in a situation where your media's aspect ratio
isn't the same as your sequence's. It's certainly possible that we
have some inconsistencies in that case. FCP considers "DV" aspect
ratio to be 0.88889, which gets divided by two when we report it to
FxPlugs running on a single field.
Could you file a bug report at bugreport.apple.com, and include your
media? It would be great if you could trim the media down to a second
or two before attaching it to the bug.
Thanks!
- Paul
On Nov 6, 2008, at 8:03 PM, Stonewall Ballard wrote:
In FCP 6.0.4, in a sequence set to a Pixel Aspect Ratio of NTSC-CCIR
601/DV (720x480), and a Frame size of 720x486 (CCIR 602 NTSC 40:27),
the output image info says it has a pixelAspect of 0.444444.
When the input is a 720x486 clip listed as Pixel Aspect NTSC-CCIR
601 in the browser, its imageInfo says it has a pixelAspect of
0.395062. The same input frame fetched via the temporal API using
getBitmap:layerOffsetX:layerOffsetY:requestInfo:fromParm:atTime:
reports a pixelAspect of 0.444444. At least
getInputBitmap:withInfo:atTime: shows that same frame with a
pixelAspect of 0.395062, the same as the regular input.
Why does
getBitmap:layerOffsetX:layerOffsetY:requestInfo:fromParm:atTime:
produce a different pixelAspect than the other two methods? Is there
any way to tell what the *real* pixel aspect of that frame?
Interestingly, when I set the sequence to use square pixels, all the
pixelAspects are 0.444444.
BTW, 0.444444 is 640/720/2, while I would have expected to see
648/720/2, or 0.45. I don't see where 0.39506 comes from.
Anyone know what's going on here? Is there any way to know what the
*real* PAR of an image param is?
TIA.
- Stoney
--
Stonewall Ballard
email@hidden http://stoney.sb.org/
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