有關 VMR 的解釋如下, 最新的規格是 VMR-9, 加入了可以使用3D加速卡的 pixel shaders 來直接處理視訊的資料, 並且能夠改善交錯 (Interlaced) 視訊內容的品質

要支援 VMR-9, 顯示卡的驅動程式以及 TV 卡所使用的應用程式都要支援:

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Microsoft DirectX 9.0 SDK Update (October 2004)
Features of the VMR

The Video Mixing Renderer 7 (VMR-7) supports the following new features:
Real mixing of multiple video streams, using the alpha-blending capabilities of Direct3D hardware devices.
The ability to plug in your own compositing component to implement effects and transitions between multiple video streams entering the VMR.
True windowless rendering. It is no longer necessary to make the video playback window a child of the application's window in order to contain video playback. The VMR's new windowless rendering mode allows applications to easily host video playback within any window without having to forward window messages to the renderer for renderer-specific processing.
A new renderless playback mode where applications can supply their own allocator component to get access to the decoded video image prior to it being displayed on the screen.
Improved support for PCs equipped with multiple monitors.
Support for Microsoft's new DirectX Video Acceleration architecture.
Support for high-quality video playback concurrently on multiple windows.
Support for DirectDraw Exclusive Mode
100% backward-compatibility with existing applications.
Support for frame stepping and a reliable way to capture the current image being displayed.
The ability for applications to easily alpha-blend their own static image data (such as channel logos or UI components) with the video in a smooth flicker-free way.

The VMR-9 supports all the features listed above, plus:
The ability to process video data directly with Direct3D APIs such as pixel shaders.
Improved support for interlaced video content.
Support on any platform supported by DirectX.
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LCD 不用換, 把顏色跟對比還有亮度調準確就可以玩的很愉快了

視訊處理並顯示的品質當然跟 VGA 卡有關, A 社的產品絕對是首選, 不論是用 OVERLAY 或是 VMR 的處理方式都比 N 社的產品來的好

OVERLAY 指的是外部視訊輸入的影像 ** 覆蓋 ** 在 VGA 卡所顯示的的作業環境中, 這會使得顯示卡需要將它的記憶體配置一塊區塊空間提供給視訊顯示之用

VMR 則是新的視訊的顯示方法, 影像品質會比 OVERLAY 的方式更好, 目前最新的標準為 VMR-9

以上...