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Είναι ο Ήχος και το Βίντεο Συγχρονισμένα;

Detect audio-visual desynchronization by measuring the perceived offset between a visual flash and its paired sound. Identify lip-sync issues in your setup — all processed locally in your browser.

This test presents simultaneous audio and visual stimuli and asks you to judge their synchronization. By adjusting the offset until they appear synchronized, it measures the audio-visual delay in your system pipeline.

Humans can detect audio-visual desync as small as 45ms when audio leads video, but tolerate up to 125ms when audio lags behind video.

Flash area

Τι Σημαίνουν τα Αποτελέσματά σας;

Result Range Meaning
Καλό Offset within ±30ms Your audio and video are well synchronized. This offset is imperceptible to virtually all users during normal content playback.
Προειδοποίηση Offset between 30–80ms Slight desynchronization detected. Most users will not notice this during general viewing, but it may be perceptible during fast-paced content or when closely watching lip movements.
Κακό Offset greater than 80ms Noticeable audio-visual desync. This will be visible during video calls, movies, and gaming. Common causes include Bluetooth audio latency, HDMI audio delay, or software processing overhead.

Συνηθισμένα Προβλήματα και Λύσεις

Audio consistently arrives after the visual flash

Bluetooth audio devices add 100–300ms of latency. Switch to wired headphones or speakers for sync-critical tasks. If using HDMI, check your TV or monitor's audio delay settings and enable 'Game Mode' to reduce processing latency.

Audio arrives before the visual element

This can occur when display processing adds latency (common on TVs with heavy post-processing). Enable Game Mode on your display to minimize input lag, or add an audio delay offset in your media player settings.

Σχετικά εργαλεία

Δοκιμή καθυστέρησης ήχου

Μετρήστε την καθυστέρηση εξόδου ήχου

Δοκιμή Input Lag

Μετρήστε τη συνολική καθυστέρηση εισόδου

Δοκιμή χρονισμού καρέ

Μετρήστε τη συνέπεια χρόνου καρέ

Συχνές ερωτήσεις

What causes audio-visual desync?

Common causes include Bluetooth codec latency (100–300ms for SBC/AAC), HDMI audio processing delay, TV post-processing adding display latency, and software audio buffering. Each stage in the pipeline can add milliseconds of delay.

Does Bluetooth always cause audio delay?

Yes, all Bluetooth audio has some latency due to encoding and transmission. SBC codec adds 100–200ms, AAC around 120–180ms, and aptX Low Latency achieves approximately 40ms. Only wired connections provide near-zero audio latency.

How can I fix lip-sync issues on my TV?

Enable Game Mode to reduce display processing latency. If your TV has an audio delay or A/V sync adjustment, use it to add delay to whichever channel arrives first. Using the TV's built-in speakers or an optical audio connection often has less delay than Bluetooth.

Is any data uploaded during this test?

No. The test uses the Web Audio API and Canvas for stimulus generation. All timing and offset calculations happen locally in your browser with no server communication.