Re: FCE: pixel aspect changing based on canvas window background?
Re: FCE: pixel aspect changing based on canvas window background?
- Subject: Re: FCE: pixel aspect changing based on canvas window background?
- From: Steve Christensen <email@hidden>
- Date: Wed, 18 Jun 2008 16:40:09 -0700
Hi Paul,
I understand about changes in size, pixel aspect and scale due to
different rendering settings and have that handled. My question was
directed more at the differing pixel aspects, which as you say could
be a bug.
I'm currently ignoring the input pixel aspect and just using the
output pixel aspect for both images; this seems to be working OK for
what I'm doing. Are there any cases, though, where the input and
output pixel aspects would actually be different (and thus I'd get
bitten)?
steve
On Jun 18, 2008, at 2:29 PM, Paul Schneider wrote:
Hi Steve,
When you switch your background to anything other than black, Final
Cut enters its legacy "Non-RT" display path. The render settings
in this path are quite different. There is some documentation for
this in the FxPlug SDK, in a document called "Rendering FxPlug
Effects In Final Cut.pdf". Stills are handled differently than
video in this path.
The mismatched aspect ratios for the input and output seems to be a
bug; I'll check it out.
Let me know if the document doesn't answer your questions, or if it
leaves you with more questions than answers (certainly possible!).
- Paul
On Jun 17, 2008, at 5:29 PM, Steve Christensen wrote:
Here's what I'm doing:
1. Launch FCE with no project (looks like it defaults to DV NTSC).
2. Drag a DV movie to the timeline.
3. Apply my filter to the DV clip (filter is using FxBitmaps).
4. Make sure that the viewer window background is set to black.
I'm seeing:
inputA: 720 x 240, pixelAspect = 0.444444
output: 720 x 240, pixelAspect = 0.444444
5. Change the canvas window background to one of the other options
(i.e., checkerboard).
Now I'm seeing:
inputA: 703 x 468, pixelAspect = 0.790123
output: 703 x 468, pixelAspect = 0.888889
Is there a reason for the change in pixel aspect, and in
particular seeing different aspects for the input and output images?
I see slightly different behavior for still images. While the
pixel aspect changes between a black background and any of the
others, the input and output pixel aspects are the same. Why the
difference between still images and video?
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