AV Sync Test — Measure Audio-Video Delay
Free AV sync test that pulses a synchronised visual flash and audio click. Capture both on your phone's slow-motion video, count frames between them, and you have your audio-video delay in milliseconds — set that as the AVR/receiver delay correction. No equipment beyond a phone needed.
Step-by-step
1
Set up phone slow-mo
Use 240 fps slow motion, point at the flash. Make sure the audio also reaches the phone mic.
2
Press Start
A 60-fps frame counter starts. Each beat: visual flash + audio click in sync.
3
Record several beats
Capture 5–10 seconds of slow-mo footage.
4
Count delay frames
Scrub frame-by-frame. Frames between flash visible and audio peak × (1000/240) = ms delay.
5
Apply in AVR
Enter that ms value as audio delay correction in your AVR menu.
Measure your projector + AVR audio-video delay in milliseconds
0
Frame counter (60 fps)
How to measure
- Open this page on your projector / TV — make sure the flash and click are clearly visible/audible.
- Start your phone's slow-motion video pointed at the flash circle and audio meter app.
- Press Start. Record several flashes.
- Watch the recording: count frames (1 frame ≈ 16.7 ms at 60 fps) between flash visible and audio peak. That delay is your AV sync offset — set it in your AVR/receiver.
Published
Updated
