benchmarks for movie recording

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PIII, Kaleid, 1024 x 768, 30 FPS, speed = 680, 2500 samps: min = .001197, max = .004851, avg = .001821, sdev = .000362

avg .002 = .06 @ second = 6% avg usage for recording
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AMD, Kaleid, 1024 x 768, 30 FPS, speed = 680, 2500 samps: min = .000167, max = .000611, avg = .000322, sdev = 8.8329E-05

avg .0003 = .009 @ second = .9% avg usage for recording
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AMD test repeated over 5 minutes: min = .000172, max = .005491, avg = .000485, sdev = .000129

all samples were < than 1 ms except for a single single spike of 0.005491 at 3:38
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