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If you go from a center point (ie. your target pixel), its 2 pixels to each edge, for a full grid of 4x4
The naming of these things is kinda inconsistent among different tools, but madVRs 3/4-tap filters function like I outlined here, bicubic is basically 2-tap, and the other filters with 3/4 tap configuration use more pixels.
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LAV Filters - open source ffmpeg based media splitter and decoders
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