Well, part of the issue is that Jitter is in fact Jittery for normal QT playback, and because all of this is also contingent on how you are sending frames to OpenGL. If you continuously bang the renderer or have the texture sent to the syphon server banged you will cause additional and possibly duplicate frames sent out from Jitter to Syphon, even though you have @unique 1 specified in your jit.qt.movie. The frame duplication is also an issue on how GL is drawn and handled. Suffice it to say it is nuanced.
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