What Do Audio-Visual Synchronization Metrics Actually Measure?

Automatic AV-sync metrics are widely used to rank and train audio-visual generators, but they are rarely audited as measurement instruments. We jointly audit AV-Align, ImageBind AV-relevance, JavisScore, and Synchformer/DeSync under a common reliability protocol: controlled-distortion monotonicity, preprocessing sensitivity, rank uncertainty, cross-metric agreement, PEAVS-proxy agreement, and learned fusion. The result is an axis split, not a single winner: Synchformer/DeSync is the strongest temporal-offset tracker (τ=0.84), ImageBind/JavisScore better match the PEAVS human-aligned proxy (τ=0.20) and content-disruption families, and AV-Align is the weakest standalone metric. The metrics mutually disagree (Krippendorff α=0.066), and neither linear nor simple k-NN fusion improves PEAVS agreement over the best individual metric. We recommend reporting AV-sync as a Reliability Card (metric-family breakdowns with confidence intervals) rather than a single bare synchronization score.