Le 2 avr. 08 à 17:15, vade a écrit :
How are you doing the compositing/overlaying?
I dont have any experience with this explicitly, but I would imagine
different types of compositing would have different overhead GPU/CPU
wise.
My test machine is an iMac 20" CoreDuo with a Radeon X1600 with 128MB
VRAM.
I've tried getting a CVOpenGLTextureRef from QuickTime and injecting
it into my composition via an image input port. The composition is
pretty simple : apart from the image input port to display the movie,
it just has a simple static text on top of it -> 12 fps
I've also tried using a CI composite filer. From the
CVOpenGLTextureRef I build a CIImage that represents a movie snapshot.
I then mix the CIImage of the movie with the output of the composition
(which in that case just displays some text). Then I draw the result
into a CIContext that's been initialized with the openGLContext of my
NSOpenGLView -> 12 fps
Without any quartz composition, getting the CVOpenGLTextureRef from
QuickTime; building a CIImage from it; and displaying it into a
CIContext makes the movie play nicely at 25fps.
Jérome _______________________________________________
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