GeForce3 chip has the same DVD/MPEG2 acceleration features as GeForce and GeForce2, which includes AFAIK
- pixel-level colorspace conversions
- hardware subpicture compositing (blending intermediate frames between keyframes onto the overlay)
- motion compensation
One consumer video card bests the whole GeForce series in this area though: Radeon. It supports Inverse Discrete Cosine Transformations (the very basis of actual image data compression in MPEG video formats) on hardware making it about as good as dedicated decoders for DVD playback.
In the end, if you have a machine that can actually take advantage of a GeForce 3, do you really need to care about your machine being too slow to decode MPEG2? However, I do like my hardware full featured.
The Radeon also has them special deinterlacing features and such. Decoding aside the Radeon is still best for quality. Savage beats Geforce for video quality (movies) as well due to superior scaling and whatnot. I prefer fully featured cards too.
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