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Is pixel shader useful in movie playback?

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Is pixel shader useful in movie playback? For example, using the graphic card to do some filtering calculations, noise-reducing, sharpening, etc. Does it worth? What kind of way do Windows Media Player, Divx codec and ffdshow use? Sorry that I am just a beginner.

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The ones you mention all have Directshow playback filters.
Directshow is implemented as a set of filters running in a stream. If you need a resize, sharpen or mask operation you can just insert your own filter into the stream.
There is a directshow basics article in the articles section I believe.

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