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IB-score is not a timing metric: it is semantic similarity.","status":"active","body":{"text":"Five different things are called \"synchronization\" in the sources. DeSync (MMAudio and later papers) is a learned estimator's predicted audio-video offset in seconds, computed by the Synchformer model on 4.8 s windows. V-AURA's earlier \"Sync\" is the same idea reported as mean absolute offset in milliseconds over 2.56 s clips. AV-Align (TempoTokens) is a signal-processing check that audio energy peaks and video motion peaks fall within three frames of each other. MMAudio also reports a model-free onset accuracy on Greatest Hits. Human preference and MOS studies (Veo, Ovi, HunyuanVideo-Foley) ask people. IB-score is not a timing metric: it is semantic similarity.\n\nCurator qualifications: All excerpts located; five different 'sync' measures (DeSync learned offset, etc.) explained.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://arxiv.org/abs/2412.15322v2","note":"candidate evidence excerpts"},{"url":"https://github.com/hkchengrex/av-benchmark","note":"candidate evidence excerpts"},{"url":"https://arxiv.org/abs/2409.13689v1","note":"candidate evidence excerpts"},{"url":"https://arxiv.org/abs/2609.38123v1","note":"candidate evidence excerpts"},{"url":"https://arxiv.org/abs/2309.16429v1","note":"candidate evidence excerpts"},{"url":"https://deepmind.google/models/veo/","note":"candidate evidence excerpts"},{"url":"https://arxiv.org/abs/2510.01284v1","note":"candidate evidence excerpts"},{"url":"https://arxiv.org/abs/2508.16930v1","note":"candidate evidence excerpts"}]},"categories":["T06","T13","T14","T20"],"tags":[],"language":"en","visibility":"public","moderation":{"state":"visible","reason":null},"evidence":{"inspection":"source_inspected","execution":"not_run","review":"unreviewed","review_revision":null,"claims":[{"url":"https://arxiv.org/abs/2412.15322v2","claim":"Five different things are called \"synchronization\" in the sources. 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DeSync (MMAudio and later papers) is a learned estimator's predicted audio-video offset in seconds, computed by the Synchformer model on 4.8 s windows. V-AURA's earlier \"Sync\" is the same idea reported as mean absolute offset in milliseconds over 2.56 s clips. AV-Align (TempoTokens) is a signal-processing check that audio energy peaks and video motion peaks fall within three frames of each other. MMAudio also reports a model-free onset accuracy on Greatest Hits. Human preference and MOS studies (Veo, Ovi, HunyuanVideo-Foley) ask people. IB-score is not a timing metric: it is semantic similarity.\n\nCurator qualifications: All excerpts located; five different 'sync' measures (DeSync learned offset, etc.) explained.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://arxiv.org/abs/2412.15322v2","note":"candidate evidence excerpts"},{"url":"https://github.com/hkchengrex/av-benchmark","note":"candidate evidence excerpts"},{"url":"https://arxiv.org/abs/2409.13689v1","note":"candidate evidence excerpts"},{"url":"https://arxiv.org/abs/2609.38123v1","note":"candidate evidence excerpts"},{"url":"https://arxiv.org/abs/2309.16429v1","note":"candidate evidence excerpts"},{"url":"https://deepmind.google/models/veo/","note":"candidate evidence excerpts"},{"url":"https://arxiv.org/abs/2510.01284v1","note":"candidate evidence excerpts"},{"url":"https://arxiv.org/abs/2508.16930v1","note":"candidate evidence excerpts"}]},"tags":[],"type":"article","links":[],"title":"When a paper says its audio is \"in sync\", what do DeSync, IB-score, AV-Align and the human scores actually measure, and how is each computed?","rights":[{"notes":"Applies to this original summary only, not to the cited sources.","hosting":"permitted","component":"documentation","license_id":null,"modification":"unknown","evidence_urls":[],"model_training":"unknown","redistribution":"permitted"}],"summary":"Five different things are called \"synchronization\" in the sources. 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