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Diagnose the mismatch from the viewer’s perspective
Watch the actual stream on a separate phone, tablet, or computer, not only the production monitor. Note whether audio or video leads and estimate the size of the gap. Check whether the same problem appears in a local recording, whether it affects one source or the whole mix, and how long it takes to appear.
- Audio is late: the picture leads the sound. Reduce an existing audio delay or delay the video, if your equipment provides that control.
- Audio is early: the sound leads the picture. Add audio delay or use a video-delay control.
- The gap stays about the same: a fixed sync adjustment may help.
- The gap grows during the service: suspect an accumulating timing problem. Repeatedly changing a fixed offset may align one moment but will not correct the underlying drift.
Also note whether the issue is present in a local recording. If it is, the mismatch is likely already in the production signal path. If it appears only in the viewer-facing stream, check the stream and delivery path as well.
Correct a stable offset in OBS or existing production equipment
Adjust an OBS audio source
- In OBS, identify the audio source that is out of sync. If the whole mix is affected, identify where the common audio signal enters OBS.
- Open that source’s filters and add an Audio Delay (ms) filter.
- Make a measured adjustment in the direction indicated by what you observed: add delay when audio leads, or reduce an existing delay when audio lags. OBS delay controls and signal routing can differ, so confirm the direction with a test rather than assuming that adding delay always helps.
- Use small increments—50–100 ms is a practical starting range cited by a church-stream troubleshooting guide—and repeat the test until the viewer-facing audio and picture align acceptably.
Check mixers, switchers, and encoders
If the offset begins before OBS, correct it at the relevant point in the signal chain rather than stacking compensating delays without a reason. Check the mixer, switcher, or encoder for an audio- or video-delay control. For an ATEM Mini or ATEM Mini Pro setup, the cited church guide describes a delay setting; confirm the control and procedure in the current interface and the manual for your specific unit. Labels and available controls vary by software version and hardware configuration.
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Use one deliberate adjustment at a time and test again. If only one microphone or source is out of sync, avoid delaying the entire mix unless that is what the diagnosis calls for.
Investigate drift that worsens over time
A fixed offset and progressive drift are different problems. When audio and video start aligned but separate increasingly, check that OBS, the audio device, and the operating system use consistent sample-rate settings, and inspect whether the devices’ clocks remain synchronized. The exact cause and correction depend on the rig; there is no universal device-specific fix established here.
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YouTube’s recommended encoder audio settings are delivery guidance, not proof of a universal remedy for clock drift. Change sample-rate or clock settings only with the relevant device and software documentation in hand, then test for the full duration in which the problem previously appeared.
Test the stream and distinguish sync from latency
Run a representative viewer test
YouTube recommends pre-stream tests that include audio and movement similar to the real event, and advises operators to monitor stream health and review messages. If possible, use a private or unlisted test and have someone watch it on a separate device. Speak, move visibly, and test long enough to reveal a mismatch that develops over time.
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Do not rely only on local monitoring: it may not represent what viewers receive. If the test still shows the issue, note which source leads, how large the mismatch is, whether it grows, and whether it is present in a local recording before making another adjustment.
Do not mistake stream latency for lip-sync error
YouTube defines stream latency as the delay between camera capture and display to viewers. That is different from the relative timing of audio and video. YouTube Help explains, “The lower the latency, the less read-ahead buffer the video player will have.” Lower latency can make viewers more vulnerable to buffering, so switching to low latency for a non-interactive sermon is not a fix for lips-versus-voice sync. YouTube Help: Understand live streaming latency.
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YouTube also says HLS has higher latency than RTMP because HLS sends video in segments rather than continuously. That creates more total delivery delay; it does not, by itself, show that audio and video are misaligned. If the production recently changed ingest protocols, check sync in the viewer-facing stream before changing protocols. YouTube Help: Live encoder settings, bitrates, and resolutions.
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Buffering or stream-health warnings alongside the sync problem justify checking the network and encoder bitrate. OBS says dropped frames indicate that the connection to the remote server is unstable or cannot sustain the configured bitrate; its guidance is to check the server and network and lower bitrate as appropriate. Dropped frames alone do not diagnose an audio/video offset. OBS Project: Stream Connection Troubleshooting.
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- If viewers report buffering, review YouTube stream health and network stability.
- If OBS reports dropped frames, check whether the connection can sustain the configured bitrate and reduce it if appropriate.
- After connection changes, repeat the separate-device sync test; treat buffering and lip-sync as related checks, not interchangeable diagnoses.
When a delay processor is worth considering
A dedicated digital audio delay processor is a fallback when the existing OBS, mixer, switcher, or encoder controls cannot correct a stable mismatch and the device fits the signal chain. Before buying, verify supported signal formats, connectors, delay direction and range, and where the unit can be placed. No universal hardware model recommendation follows from the available guidance; check compatibility with the equipment manuals first.
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