Measure audio/video sync and glass-to-glass latency, right in the browser.
Point a camera at a test card. Read A/V sync and absolute latency live, with the marker lock and delay graph.
Turn this screen into the source — an ArUco marker plus a flash and chirp for an analyzer to lock onto and measure.
A secondary, zero-install live tool — readings are frame-rate-bound (tens of ms). The recorded-clip Python analyzer (240 fps) stays the precision path.