Play two of them? In what player? In Quicktime player, they would be
running in a YUV colorspace, and being zapped right to the GPU and
converted to RGB as they're displayed (at no cost to the CPU).
A sad fact of Quicktime Effects is that they're RGB only. So your
movies are going through a costly YRB > RGB conversion, then having
the effects applied, then the greater mass of RGB pixels is being
pushed to the GPU.
Would that explain it?
Bruce Wheaton
On May 26, 2006, at 6:26 PM, Chuck Bueche wrote:
Hi Folks,
I've gotten my own effect up and running and am seeing a really bad
frame rate. I started with the Dimmer2EffectWindows sample (and
eventually commented out *all* of the pixel-pushing in the
EffectFilter* files).
- My source media is 1264x720, 30 fps.
- On my system I can play two of these simultaneously with no
apparent performance hit (roughly 10 mbits/sec).
Even the simplest effect (even a complete NOP applied to only one
source, for that matter) causes the frame rate to drop to 15 fps
or less.
Is this simply due to moving a complete image around in RAM, rather
than changed pixels per frame? Is there something I've missed
that would cause this?
Thanks,
Chuck Bueche
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