Re: [Deinterlace-discuss] Problems fixed
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From: Rob M. <rob...@gm...> - 2005-06-22 14:56:14
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At 15:55 22-06-05, Atsushi Nakagawa wrote: >Isn't it only necessary that the code in question measure out a delay of >*at least* 20 us, and not necessarily an exact 50 kHz event? I was under the impression the latter was true. I am not sure though. It would make things very simple when just a certain delay is needed. When looking at the way the delay is currently handled it seems unlikely that just a minimum delay is needed. I have done some testing and it seems the delay does not really matter, at least on my machine. Multiplying or dividing the delay by 1000 does not result in a noticeable difference. Maybe this means we should just switch to the high resolution timer. Unfortunately I can't be sure if other capture cards are working in a similar way. >(Aside: What criteria determines whether 200,000 times per second is >enough? Since it's four times 50 kHz, isn't it sufficient?) What is the slowest machine DScaler should run on? On a p2 200MHz roughly 100,000 measurements can be made. Without knowing anything about the requirements I guess 2 times 50 kHz is not fast enough to be safe. Rob |