Hi, new to the list, looking for a little pro help with a small problem.
I've made a small cocoa app with a Quartz Composition embedded in it
to display a live feed from a firewire connected DV camera. I used QC
View to add the composition into a window and have a
QCPatchController to allow the user to change a few published
settings. Here is the current app: http://homepage.mac.com/mark.burton/app/FlipFlop.zip
With standard DV input the performance is fine, but the app does use
about 30-40% of the processor's on a Dual G5 2.0. However I am also
trying to make the app work with a DVCPRO HD input which is a much
more processor intensive codec and the performance for this is unusable.
In reading on a bit further, it seems that what I should do now is to
use QC Renderer to play the composition. Does this allow greater
performance with the overlay as its using an 'OpenGL context'?
What's not entirely clear to me is what advantage I will get by using
the QCRenderer. Obviously its a lot more actual code writing but the
Apple doc's have gotten me this far so I'm keen to have a go if its
worth it.
Alternatively, perhaps I should be using QTKit instead of a Quartz
Composition - the main features must allow live preview of firewire
video input, allow real time 180 degree rotation and real time de-
saturation. There are a few other features I want to implement such
as being able to scale without loosing aspect ratio and also make
fullscreen, but for now the main objective is to solve the
performance issue.
Any insight much appreciated.
--
Mark
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