A/V OFFSET SCANNER / DIAGNOSTIC

Lip Sync

Measure relative audio-to-video offset with this device's camera and microphone — from a generated reference pattern or physical taps — with uncertainty, baselines and device profiles.

StandbyRelative A/V offset · positive means audio arrives later than video

Runtime browserResult relative A/V offsetSign + = audio lateMedia stays on device

Control depthField essentials

Measurement

Measure the device itself first, then the system under test. The difference is the result.

Mode

Baseline: tap in front of this phone. It captures this phone's own camera-to-microphone skew.

Device / baseline identityNo baseline stored on this device.

Device profileNo device profile loaded. Measure a baseline instead, or load a profile.

Load profile

A profile is this device's own camera-to-microphone skew, measured once. With one loaded, a single capture is the measurement — no baseline step. It is refused if the capture settings do not match the ones it was measured at.

Capture

Automatic gain, noise suppression and echo cancellation are requested off; they move transients.

Camera

Object distance (m)

Reporting point

BASELINE— FPSCLOCK ——PIPE —

STANDBYGrant camera and microphone access, frame the object you will tap, then start the measurement.

Video0

Audio0

Source signal

Idle.

Result & evidence

Relative A/V offset with uncertainty, interpreted against ITU-R BT.1359 and EBU R37 bands.

Relative A/V offset—No measurement yet.

Frames: —
Uncertainty: —
Event spread: —
Paired taps: —
Frame rate: —
Confidence: —
Signal: —
Visual resolution: —

Relative A/V offset, not absolute end-to-end latency.
Browser camera and microphone timestamps are not a validated shared hardware clock.
Recorder skew is only removed once a baseline or device profile for this device is applied.
Impact mode is limited by the gesture; a generated reference pattern is far more repeatable.