FPS— VIEWPORT— DPR— AUDIO— LATENCY— CLOCK—
AV Sync Test

AV Test Patterns — Field Guide

Keyboard shortcuts

1–8Jump to pattern ←→Previous / next pattern FToggle fullscreen MMute / unmute audio []Audio offset −/+ 10 ms (AV Sync) 0Reset audio offset SpacePause / resume (Motion) SToggle scroll / sweep / cycle IInvert (Focus) HInfo HUD (fps, viewport, latency) ?This help EscClose menus / exit fullscreen

Tips for on-site use

Press F first so the pattern fills the display with no browser chrome. Controls auto-hide after 5 s; move the mouse or tap to bring them back. The current pattern and settings are saved in the URL, so you can bookmark or share a specific test.

What to look for

Browser rendering, display processing and audio devices each add their own delay. Use the audio offset to measure the end-to-end A/V delay of the chain under test; a positive value means audio must be delayed to match the picture.