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[video] fmv_chroma_smoothing = true makes the OpenGL present of a 24-bit (MDEC) frame keep each sample's luma and take its chroma from a [1 2 1] tent over the 3x3 source pixels, hiding the 2x2 colour blocks of 4:2:0 video without softening luma. Pairs with the existing fmv_filter upscale. Guest VRAM/MDEC output untouched; 15-bit presents and the default unchanged. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>