From: Andrew Straw <strawman@as...> - 2005-03-01 21:26:26
Johann Schoonees wrote:
> You have my empathy because this is an easy mistake to make:
> The "frame rate" used in IEEE 1394 transfers is only sometimes the
> rate at which frames are actually sent. It should really be called
> the "transfer rate". Its real meaning is the packet size sent every
> bus cycle until the whole frame has been transfered. After that
> nothing is sent until the next frame is ready.
Or maybe "bus frame rate".
> Looking at the shutter speed above, clearly the camera is unable to
> send frames any faster than 1/0.00986 = 101.4 fps no matter what the
> framerate. Try a faster shutter! :-)
Ahh! It works! Geez, I don't know what I was thinking. (Actually, I do
-- I imagined 0.009 was closer to 0.001 than 0.01. For some reason, all
those zeros seem to confuse me -- I once lost a final round of a math
contest because, although I had the right answer on paper, I announced
something like "10000" instead of "100000".)
Thanks again for your help...