AFAIK its a video mode that allows the video stream to be rendered to your video card's framebuffer directly rather than using overlays. VMR has been around at least since DX7(hence the other references to VMR7 I think) but haven't been very usable or useful till VMR9, which is included in DX9.
I may be wrong though so someone in the know feel free to correct me.
A forum community dedicated to home theater owners and enthusiasts. Come join the discussion about home audio/video, TVs, projectors, screens, receivers, speakers, projects, DIY’s, product reviews, accessories, classifieds, and more!