First determine whether the audio is consistently out of sync or whether the gap grows as the VOD plays. A steady offset may be corrected once; progressive drift usually calls for checking timing, audio formats, and the capture route. A fixed sync offset should not be treated as a universal fix for drift.
Tell fixed delay from progressive drift
Compare the audio and video near the start of the saved VOD and again later. If the gap is about the same at both points, you may have a fixed offset. If the gap increases, treat it as progressive drift and investigate the capture and timing chain before adjusting a fixed offset.
Make the comparison in the saved VOD, not only while monitoring the live stream. Record when the mismatch first appears, whether it grows steadily, and whether you hear crackling or other changes. Those details help distinguish a persistent offset from a problem that develops during a long session.
Work through the diagnosis in order
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Record a reproducible example
Note your OBS version, audio sources, connected devices, sample rates, channel layout, and stream protocol if known. Compare the VOD near its beginning and at a later point. One OBS GitHub issue describes a user’s 20–30-minute reproduction test; that is an individual report, not an official minimum duration or a universal test standard. OBS Studio issue #8054.
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Check OBS and device audio formats
Review the sample rate and channel layout selected in OBS and compare them with the audio devices in the capture chain. YouTube’s Live API documents audio sample-rate and mismatch conditions, and names 44.1 kHz and 48 kHz as recommended sample rates. These checks can identify a configuration mismatch, but they do not establish that a mismatch is the cause of every drift problem. YouTube Live API: liveStreams.
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Match channel format to the protocol
Check whether the stream is stereo or 5.1 surround and confirm the ingestion protocol. YouTube’s HLS guidance recommends 44.1 kHz for stereo and 48 kHz for 5.1 surround. Those are HLS-specific recommendations; do not apply them as a universal setting for every protocol or channel layout. YouTube HLS ingestion encoder settings.
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Review YouTube stream health and OBS dropped frames separately
Check YouTube Live’s stream-health information for audio configuration warnings. Also watch OBS’s dropped-frame indicator. An alert is evidence to investigate, not proof that it caused the audio symptom. OBS says: “When the "Dropped frames" counter is increasing and the connection square is yellow or red, this means that your connection to the server* isn’t stable or that it can’t keep up with your set bitrate.” Dropped frames point to a stream-delivery or network issue; they do not, by themselves, diagnose audio clock drift. OBS Project Help Portal: stream connection troubleshooting.
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Isolate the audio capture route
If the problem occurs with application-audio capture, compare it with another available audio capture route. Keep the other settings stable and change one variable at a time. The cited OBS issue reports one user’s application audio crackling and becoming delayed during a long session, while desktop audio reportedly did not show the same symptom. It concerns OBS 29.0.0 and is an anecdote, not evidence of a general or current OBS defect. OBS Studio issue #8054.
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Recheck the VOD after each change
Compare synchronization at several points in the saved VOD after every controlled change. If only the opening seconds improve while the gap keeps growing later, progressive drift has not been shown to be resolved. Avoid changing several settings at once, or you will not know which change mattered.
What a sync offset can and cannot do
A one-time offset may help when the mismatch remains steady throughout the VOD. It cannot be assumed to correct a gap that accumulates over time. The official references cited here do not provide a universal OBS procedure or guaranteed fix for progressive drift; the appropriate next step depends on your devices, audio route, OBS version, and stream configuration.
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