gap = L1(generation → ground-truth target) − L1(generation → the clip the model was given). Negative = the edit moved toward the target. Identical per-clip seeds across every arm, so these are paired.
Two-sided exact sign test over the 30 paired per-clip differences. Bold p = significant at 0.05.
Per direction: input · anchor frame (outlined, a still — what
--prepend-ref prepends) · the four arms · ground truth. The caption fed to the
caption arms is printed above. Audio muted by default.