AV LabBeta
Free A/V sync test, LED wall test patterns and dead pixel test
AV Lab is a toolbox for setting up and checking AV systems. Measure audio/video sync (lip sync) through consoles, video processors and LED walls, line up LED cabinets and projectors with an alignment grid, find dead or stuck pixels with full-field colours, and play test tones. It runs in the browser; an installed version for Windows and Mac gives sample-exact audio timing.
Use it for
- A/V sync and lip sync test through an LED wall, projector or video processor
- Dead pixel and stuck pixel test on LED walls, monitors and TVs
- LED wall test pattern and alignment grid, cabinet by cabinet
- Projector alignment and edge blending test pattern
- EBU color bars with PLUGE for signal checks
- Test tones: 1 kHz or any sine from 50 Hz to 16 kHz, bursts, pink and white noise
Features
- A/V sync measurement, locked to the display refresh
- Broadcast test patterns
- Tone generator
- Pixel Health full-field colour cards
- LED wall output on the extended display
Questions
- How do I test audio/video sync (lip sync)?
- Open AV Sync, pick the frame rate of your show and send the full-screen output to the screen or LED wall. Every second it shows a white flash with a 1 kHz pip. Listen on the PA: where the sweep marker is when you hear the pip is the A/V offset. Set that delay on the audio console or video processor and check again.
- How do I find dead pixels on an LED wall?
- Open Pixel Health and step through full-field red, green, blue, white, black, yellow, cyan, magenta and broadcast blue. A pixel that stays dark on every colour is dead; one that stays lit in one colour is stuck. Uneven modules show up on white and grey.
- Can I make a test pattern for my LED wall resolution?
- Yes. Test Patterns makes an alignment grid or EBU color bars at presets like 1080p and 4K or any custom size up to 16384 px. You can set the grid to one cell per LED cabinet, add overlap for projectors, and download the pattern as a full-resolution PNG.
- Which frame rates does the A/V sync test support?
- 24, 25, 30, 48, 50 and 60 fps, with a 1- or 2-frame flash.
- Is the browser version accurate enough?
- For most checks, yes. Browsers add a little audio timing jitter, so for sample-exact measurement and audio output selection use the installed Windows or Mac version.