I'm displaying the images from my webcam using a timer in which I call
the function SGIdle on my grabber component.
It works if I started my grabber with startRecord, but when I change it
into startPreview, SGIdle is still called but never lead to the
execution of my callback as it does with startRecord.
I don't understand because the QuickTime documentation says : "After
starting a preview or record operation, the application calls this
function [SGIdle] as often as possible. The sequence grabber component
then calls your SGIdle function."
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