FAST FIX

Fix Lip Sync in Your Stream

If stream audio is ahead of or behind video, start with a repeatable flash/blip or clapper reference, measure the returned or recorded output, and delay the source that arrives early.

Open AV Sync Reference Loop

Use it as a subjective reference through the real path, then measure and verify the output before production.

Important: A static offset only fixes a stable timing difference. If sync changes during the stream, investigate clocking, sample-rate, capture, and source stability.

Quick Steps

  1. Record the real returned/program output with a clear A/V reference.
  2. Measure whether audio or video arrives early and by how many milliseconds.
  3. Delay the early source, then repeat the recording to verify.

Use It Fast

  • Useful for capture cards, webcam + USB mic mismatch, and live program feeds.
  • Use the buffer calculator only when a documented sample/buffer stage needs conversion to milliseconds.

Next Step

Understand OBS audio sync first Use the OBS-specific guide if the lip sync problem lives inside your OBS capture and audio chain. Audio Buffer Latency Calculator Convert known buffer and Dante receive-latency values into milliseconds and frame equivalents. AV Sync Reference Loop Use a practical visual/audio reference on a real screen when you want to compare the actual output path instead of guessing by ear. Fix OBS Audio Sync Go straight to the OBS-specific path if that is where you need to apply the offset. Fix vMix Audio Sync Use the vMix-specific path when the problem lives in a live production input chain. SMPTE Timecode Calculator Check frame offsets and timing math when sync work spans multiple sources.