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Test the loop before changing settings
Use the same media, OBS scene, audio routing, and encoder path you intend to use for the public stream. Include both sound and visible motion; a clap, a spoken word with a visible mouth movement, or another clear cue makes comparison easier. YouTube recommends testing with representative audio and movement and checking stream health before going live: Choose live encoder settings, bitrates, and resolutions.
- Record a local sample or send an unlisted or private test broadcast.
- Check a synchronization cue near the start, then check another point later in the recording or test.
- Compare the saved recording or test stream, not only OBS’s monitoring preview. Monitoring playback can differ from the encoded output.
Identify a fixed offset or progressive drift
Fixed offset
If audio is early or late by roughly the same amount at the beginning and later in the test, treat it as a constant offset. A sync delay can correct this kind of mismatch.
Progressive drift
If the mismatch increases as the stream runs, a fixed adjustment may only make one point look right while leaving another wrong. Check source capture and monitoring, and whether multiple devices or clocks are involved. Compare a local recording with YouTube playback to see whether the problem is already present before delivery. Community troubleshooting on the OBS forum discusses these possibilities, but the cause depends on the setup.
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Correct a stable mismatch in OBS
- In OBS, identify which audio source is early or late by reviewing the test output against the cue.
- Open the source’s Advanced Audio Properties and adjust its Sync Offset when the audio needs delay. Use a small, measured change rather than a generic value.
- If the video is the early element, check the relevant video source’s delay control instead of delaying audio blindly.
- Record or test again using the same cue. Confirm the adjustment in the saved or streamed output before applying it to a public broadcast.
OBS community guidance describes audio sync delay and per-video-source delay as possible adjustment points; it does not establish one setting that works for every device or scene. See the OBS troubleshooting discussion.
Investigate drift instead of masking it
- Check whether the timing problem appears in a local recording as well as in YouTube playback. If it appears locally, focus first on capture, source timing, or monitoring.
- Review how audio and video sources are captured and monitored, especially if they come from separate devices with separate clocks.
- Test one change at a time and compare the beginning and later portion again. Avoid changing sync controls, frame rate, resolution, and bitrate together; otherwise it is difficult to tell what affected the result.
Separate clocks and monitoring paths are possible causes, not a diagnosis by themselves. The appropriate fix depends on which part of a particular setup introduces the drift.
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Check YouTube stream health and encoder settings
While testing, review YouTube’s stream-health messages and encoder status. The Live Streaming API includes health-message examples such as low video bitrate, frame-rate mismatch, and no audio stream: LiveStreams | YouTube Live Streaming API. These can point to delivery or quality problems; they do not by themselves identify a lipsync offset.
Keep the encoder within YouTube’s current guidance while diagnosing. YouTube recommends AAC or MP3 audio, 44.1 kHz for stereo, constant bitrate (CBR), and a two-second keyframe interval, not exceeding four seconds. These are encoder recommendations, not a guaranteed synchronization fix. Consult YouTube’s encoder settings guide for its current recommendations.
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Do not confuse viewer latency with lipsync
Latency is the delay between capture and when viewers see the event. A stream can reach viewers late while its picture and sound remain aligned. Lower-latency modes reduce read-ahead buffering and can increase buffering risk; network congestion can also delay a live stream. Changing latency mode alone is not a general fix for audio arriving before or after the picture. See YouTube’s explanation of live streaming latency.
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Quick Recap
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