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Frame Mix and Pixel Motion for footage and precomp layers when the layer's Frame Blending switch and the comp's Enable Frame Blending are on and the source time falls between source frames (rate conform, time stretch, time remap). Exact frame positions from tick arithmetic. Pixel Motion is a hierarchical block-matching optical flow (SAD search, sub-pixel parabola fit, vector median) with a bidirectional warp-blend (raster::flow). Blended footage frames are cached. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>