Method

A/V sync drift

A/V sync drift, audio onset vs video luma transition

What we measure and how

Cross-correlation between the audio-onset envelope (extracted from a mono 16 kHz decode) and the YDIF series from the merged video pass. The lag at the peak correlation in milliseconds is the measured A/V drift; positive values indicate audio leads video, negative the inverse. Spec-gated on `assets.audio.sync.max_drift_ms`.

Spec fields consulted

These Universal Media Delivery Profile paths resolve this check's thresholds against your spec snapshot at the moment the job was submitted.

• · assets.audio.sync.max_drift_ms
• · assets.audio.sync.must_match_video_duration

The full UMDP schema: /umdp.

Method identifier: av_sync_drift