Hi Ian,
I've been working with pix_video on Win2k, and it worked quite well in general. However, I found that capturing from a DV source in full resolution (720x576) didn't leave a lot of CPU cycles for other purposes on my box (P4, 2.6gig) - lowering the capturing resolution might help in your case, too. If you don't have an adequate utility for your matrox capture card, you might want to try amcap.exe or graphedit to change the settings of the WDM video capture filter. It seems like the mac code for grabbing pixes is a lot more optimized: someone stated recently that handling hd video (1080i) posed no problem on recent macs ...
Another hint would be upgrading DirectX and/or the capture drivers on that machine. I couldn't manage to get GEM to render any textures with the version of directx that shipped with win2k on my laptop.
Hope this helps (although I'm merely stating the obvious), Thoralf.
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