ATI AIW Users who drop frames w/ MPEG-2

[patrickm]

i was just hunting through my win2K registry and found an interesting key under:

HKEY_LOCAL_MACHINE\SOFTWARE\ATI Technologies\WDMCapture

EnableUseAGPMemcpyforVidcap

i'm not sure why this wouldn't be enabled or if it even works, but having more memory to use during capture couldn't be a bad thing. i haven't actually tried it yet since i don't really have any need to on a 900 Athlon, but those of you who have celerons or older P2/P3s might want to give it a try. also try going into the BIOS and upping the 'AGP Aperture size' to 32 or 64Mb depending on how much ram you have to spare. this is allowing some of the main memory to be shared as extended AGP texture memory.

so hopefully this'll help out some people having trouble with jerky MPEG-2 captures. post any differences you notice if you try it. i'm not sure if there's a similar key in win9x, since i'm on VFW drivers in ME.

this is for the AIW 128 Pro AGP 32M with MMC 7.1 and drivers 5.13.01.192 (i think)

[RFontenot]

patrickm,

Using the AGP bus to access main memory for extra video memory was one of those ideas that seemed like a good idea at the time, but never really worked out.

In practice, accessing memory on the video card is faster than accessing main memory via the AGP bus, which is why you see video cards with 64MB+.

On my W2K system, enabling AGP Memory increased my CPU load by 20%. So I don't think enabling it is a good thing.

RF

<font size=-1>[ This Message was edited by: RFontenot on 2001-08-09 08:01:54 ]</font>