Ffdshow is a direct show post processor. It allows you to apply various sharpening, blurring, noise reduction, etc...... to video sources (MPEG, DIVX, DVDs, etc)
Since it is a S/W function it can be fairly CPU intensive. Most here will agree that it is a must have for the ultimate in DVD playback picture quality. Of course everyone has their own favourite setting.
There is a long thread on the resize filter (currently the most popular). Look for that and try playing around with it.
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