Web Speech API: Playout Buffer Caption Sync Test

Verifies Example 2: Using a 1.5s playout delay buffer, the delayed video frame arrives on screen at the exact time of the spoken caption for frame-accurate lip-sync.

Idle

Live Camera Feed (t = 0ms delay)

Speak into your microphone. Your mouth moves immediately here.

Delayed Playout Feed (+1500ms Delay Buffer)

Say something...
Your mouth moves here 1.5s later. Watch the caption light up green at the exact frame you speak!

SpeechRecognition Cues & Frame Timing Log

Transcript Raw Start / End Playout Window (ms) Current Status
Waiting for speech recognition...