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Diagnose the mismatch from the viewer’s side
Watch the actual stream on a separate phone, tablet, or computer—not only the production monitor. Note whether people’s lips move before their words are heard, or the voice is heard before the matching mouth movement. Estimate the offset and check it again later in the service.
- Lips move first; sound follows: the audio is late relative to the picture.
- Sound arrives first; lips follow: the audio is early relative to the picture.
- The gap stays about the same: treat it as a stable offset that may respond to a fixed delay adjustment.
- The gap grows over time: treat it as progressive drift, not a one-time offset.
Also note whether the issue affects one microphone or source, the whole mix, and whether it appears in a local recording as well as the viewer-facing stream. These clues help locate where in the signal chain the mismatch begins.
Correct a stable offset in OBS
A church-stream troubleshooting guide recommends adjusting an OBS source delay in measured increments, then repeating a private or unlisted test. The precise controls can vary by OBS version and setup, so confirm the labels in the interface you are using.
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- Identify the affected audio source. In OBS, locate the microphone, mixer feed, or other audio source that is out of time. Check whether the mismatch is limited to that source or affects the full mix.
- Open the source’s filters. Add an Audio Delay (ms) filter to the relevant source.
- Adjust in the direction the test indicates. If audio is early, add delay to the audio. If audio is late, an additional audio delay would make it later; instead, look for a way to delay the video or correct timing earlier in the chain. The available controls depend on your production setup.
- Change the value in small steps. The guide suggests increments of 50–100 ms as a practical starting point, not a guaranteed setting for every rig.
- Test again from a separate viewer device. Repeat the adjustment until the lips and voice align acceptably in the stream itself.
Apply correction at the point that creates the mismatch, where possible. If the offset is introduced by a mixer, switcher, or encoder, a control there may be more appropriate than compensating for it on an unrelated OBS source.
If your setup uses an ATEM Mini
The same church-focused guide describes a delay setting on ATEM Mini and ATEM Mini Pro setups. Check the current interface and the manual for your exact unit before changing it; controls and labels can vary with hardware configuration. Do not add delay blindly: first establish which side is early.
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If the audio gradually drifts out of sync
A fixed offset can move the whole audio track earlier or later, but it cannot correct a mismatch that keeps accumulating. If the stream begins aligned and becomes progressively less aligned, check that OBS, the audio device, and the operating system use consistent sample-rate settings, and investigate whether their clocks are staying synchronized.
The available guidance does not establish one device-specific clock fix that works for every setup. Compare when the drift begins, whether the same drift appears in a local recording, and whether it affects one source or the whole mix. Use the results to narrow down the part of the signal chain to inspect; avoid treating a single delay value as a cure for progressive drift.
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Do not confuse lip-sync error with YouTube latency
YouTube stream latency is the time between camera capture and playback for viewers. It is not the same as the relative timing of picture and sound. YouTube explains that “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 a non-interactive sermon to low latency is not a reliable way to fix lips-versus-voice sync.
YouTube also explains that HLS has higher latency than RTMP because HLS delivers video in segments rather than as a continuous stream. That difference concerns total delivery delay; it does not, by itself, establish an audio-video offset. If the ingest protocol changed around the time the problem appeared, verify sync in the viewer-facing stream before changing protocols again.
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Rule out test and connection problems
Make a representative test before the service: include speaking and movement similar to the real broadcast, stream privately or unlisted where practical, and have someone check playback on a separate device. Monitor stream health and review any platform messages.
OBS says dropped frames mean the connection to the remote server is unstable or the configured bitrate cannot be sustained. Check the network and server connection, and lower the bitrate if the connection cannot support it. Dropped frames are a reason to investigate delivery trouble—especially if viewers report buffering—but they do not, by themselves, diagnose a lip-sync offset.
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Choose the remedy that matches the symptom
| What you observe | What to check first | Likely next action |
|---|---|---|
| Audio is early by a steady amount | Which source or point in the chain is ahead | Delay the audio at an appropriate source, mixer, switcher, or encoder control, then retest |
| Audio is late by a steady amount | Whether the video can be delayed at the point where the mismatch occurs | Use an available video-delay control rather than adding still more audio delay |
| Sync is good at first, then worsens | Sample-rate and clock consistency across OBS, the audio device, and the operating system | Investigate the source of accumulating drift; a fixed offset will not remove it |
| One source is out of sync, but the rest of the mix is not | That source’s connection and position in the signal chain | Correct the affected source instead of shifting the entire mix |
| The issue is accompanied by buffering or stream-health warnings | Network stability and whether the bitrate is sustainable | Address the connection or bitrate, then separately verify relative audio-video timing |
If existing OBS, mixer, or switcher controls cannot correct a stable mismatch, a dedicated digital audio delay processor is a possible fallback. Before buying, confirm that it supports the formats and connectors in your signal chain, offers the needed delay direction and range, and can be placed at the right point. No universal hardware model is established as the answer for every church setup.
Or let it run in the cloud
For a prerecorded sermon that you want to keep looping on YouTube, StreamNeo can run the stream from the cloud: upload the video, add your YouTube stream key, and go live. It does not go live from a camera, and it does not correct a sync problem already present in your video file—check the recording before uploading. Nothing has to stay on at home; the uploaded video streams as made, up to 4K 60fps, for one flat price per slot, and StreamNeo automatically recovers if YouTube drops the stream. The first day is free with no card. Monthly: $9.99 per month. Learn about StreamNeo, or start the free trial.
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