[PD] lowering gem camera capture CPU overhead

Ivica Ico Bukvic ico.bukvic at gmail.com
Sun Mar 18 03:56:41 CET 2007

Hi all,

I've been trying to shave off precious cycles off the FW camera input
capture. The problem is that vanilla capture of a FW camera feed (NTSC)
already introduces 50+% of CPU overhead on an AMD64 3000+. I have
experimented with lowered gem frame value, but anything below 20 seems to

So, here are the questions:

What is the cause of such a high capture overhead?

Is there a way to minimize such overhead beyond just optimizing code for sse
and other similar methods, plus the aforesaid frame option for the gem

Many thanks!

Best wishes,

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