I've made a new Comp with just the Video Input and the Billboard. I
turned off 'Enable Direct Core Image Rendering',
This will have no effect if you don't use Core Image effects
but seemed to get better results with 'High Quality' on. The Video
Device settings are set to the native format of the DVCPRO HD 1080i
input. I have tried other codecs for the compression setting even
trying 'None' but most don't work or seem to add to the burden as
this would require on the fly transcoding from DVCPRO HD to that
codec's compression type.
In this setup the Viewer shows the frame rate as jumping between
16.x and 59.x fps with 9% and 90% Rendering Load respectively, but
overall its very blurry and jerky and looks more like 18fps.
I also turned on 'Use YUV Texturing if available' as this seemed to
improve frame rate (as reported by the Viewer) so long as texturing
is set to 2D. What is tis doing and should I have the bottom
setting for 'Texture Parameters' set to Bilinear (currently set to
None)?
Using 2D texturing instead of Rectangle will resize the source video
images to have power-of-two dimensions, so you shouldn't do that
Other texture parameters will have no performance effect
________________________________________________________
Pierre-Olivier Latour email@hidden
Quartz Composer Team Apple Computer, Inc.
