If audio starts in sync with your YouTube Live video loop and gradually falls behind or moves ahead, a fixed OBS Sync Offset is unlikely to fix the underlying timing problem. First find whether the drift is already present in OBS or a local recording, then check audio sample rates and the affected source’s timestamp behavior. Treat YouTube stream health, network conditions, and OBS performance as separate diagnostic clues—not proof of a single cause.
First distinguish drift from a fixed delay
Watch for a clear audio/video cue near the beginning of a test and again later—for example, a visible clap paired with an audible click. If the gap stays about the same, the problem is a constant offset. If it grows over time, it is gradual drift and calls for timing diagnosis rather than an arbitrary offset.
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| What you observe | What it suggests | First useful check |
|---|---|---|
| Audio and video are offset by about the same amount throughout. | A constant sync offset. | Confirm the delay with a sync cue; if it is stable, calibrate the relevant source with OBS Sync Offset. OBS community discussion |
| Audio and video start aligned, then progressively separate. | Gradual drift. | Compare a local recording, check sample-rate consistency, and test timestamp behavior for the affected source. YouTube Live configuration guidance; OBS Audio Sources |
| The whole stream reaches viewers late, but speech and action remain aligned. | Live-stream latency, not necessarily sync drift. | Review latency mode, buffering, and network conditions. YouTube defines latency as the time from capture to viewer playback. YouTube latency guidance |
| Choppy output, dropped frames, overload notices, or disconnections accompany the symptom. | A performance or connection issue may coexist. | Review YouTube stream health and OBS performance and connection diagnostics; these signs alone do not establish the cause of drift. YouTube encoder guidance; OBS performance troubleshooting; OBS connection troubleshooting |
Run a test that locates where sync changes
- Reproduce the problem safely. Run a private or unlisted YouTube test, or make a local recording, for long enough that the fault usually appears. Put a visible-and-audible sync cue near the start and another later. Compare the gap between each pair.
- Compare three outputs. Check the OBS preview, the local recording, and playback in the YouTube viewer. If the preview and recording drift too, investigate the capture source, device timing, and computer/software path first. If only YouTube playback appears affected, check stream health, ingest/network behavior, and the playback conditions before blaming a physical audio device. These comparisons narrow where to investigate; they do not identify a precise cause on their own.
- Note the time pattern. Record whether the fault is present from the first cue or grows, how long it takes to become noticeable, and whether it moves consistently ahead or behind. Repeatable observations are more useful than choosing an offset by guesswork.
Check sample rates across OBS and the audio path
Compare the sample rate selected in OBS with the formats selected or supported by the relevant microphone, capture card, audio interface, and operating system. Aim for a consistent supported rate across the sources involved. YouTube’s Live Streaming API documentation lists 44.1 kHz and 48 kHz as recommended audio sample rates and identifies a primary/backup stream sample-rate mismatch as a configuration issue; neither rate is a guaranteed cure for every drift problem. YouTube Live configuration guidance
If you use primary and backup ingestion, check that their audio settings match. A mismatch between those feeds is a separate configuration problem from a device-clock issue.
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Test device timestamps on the implicated source
OBS documents a “Use Device Timestamps” property for audio input and output capture sources on Windows. It is off by default and attempts to use information from the audio device to help prevent desynchronization. Because results depend on the source and device, do not switch it on or off for every source as a blanket fix. OBS Audio Sources
- In OBS, open the properties for the audio input or output capture source that appears implicated in your comparison.
- If the “Use Device Timestamps” control is available, note its current state and test the other state for that source only.
- Repeat the same test for the same duration and compare the early and later sync cues.
- Keep the change only if the repeatable result improves; otherwise restore the original setting and test the next relevant source separately.
Use Sync Offset only for a stable mismatch
If the audio is consistently early or late by about the same amount and does not keep drifting, OBS Advanced Audio Properties’ Sync Offset can calibrate that stable delay. Measure the mismatch in your own setup and adjust the relevant source; do not copy milliseconds from another creator or a device-specific tutorial. An AVerMedia guide’s offset example applies to its particular capture-device workflow, not every OBS setup. OBS community discussion; AVerMedia device-specific guide
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Check YouTube health, OBS performance, and the connection separately
YouTube stream health
YouTube recommends testing with audio and video motion representative of the real stream before going live, then monitoring stream health and reviewing messages while live. A test should include the kind of loop and audio sources that usually produce the symptom. A clean health dashboard is useful, but it does not prove why audio gradually drifts. YouTube encoder settings and stream-health guidance
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OBS rendering and encoding
If OBS reports encoding overload or the output is choppy, reduce rendering or encoding workload and check OBS’s performance guidance. These symptoms justify a performance check, but do not by themselves establish that performance caused gradual audio drift. OBS Encoding Performance Troubleshooting
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Network and ingest connection
Dropped frames and intermittent disconnections point to a possible network path or bitrate-capacity problem. Check the connection to the ingest server and whether the upload connection can sustain the selected bitrate. A network issue can affect delivery, but its presence alone does not explain every audio/video timing change. OBS Stream Connection Troubleshooting
Do not mistake latency for synchronization
Latency is the delay from capture to viewer playback; sync drift is audio progressively moving relative to video. YouTube says most viewers on low-latency streams experience latency below 10 seconds and most viewers on ultra-low-latency streams below five seconds. Those figures describe latency, not audio-sync error rates. YouTube also says low and ultra-low latency do not support 4K resolution. Lower latency reduces read-ahead buffering and can make viewers more sensitive to encoder-to-player issues; network congestion can delay a stream, but changing latency mode is not an established fix for progressive drift. YouTube latency guidance
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Troubleshoot by symptom
| Symptom | Likely diagnostic direction | Next action |
|---|---|---|
| Drift appears in OBS preview and the local recording. | Capture, source timing, or computer/software path. | Check sample-rate consistency and test timestamp behavior on the implicated source. |
| Local output stays aligned, but YouTube playback does not. | Delivery, ingest, stream health, or playback conditions. | Repeat a representative test and inspect YouTube health messages and connection diagnostics. |
| Mismatch is stable from start to finish. | Constant offset rather than progressive drift. | Measure it, then adjust the relevant source’s Sync Offset. |
| Drift appears alongside dropped frames, choppiness, or overload warnings. | Performance or network concerns may coexist. | Use OBS performance and connection guidance, then repeat the sync test to see whether the drift remains. |
What to collect before asking for support
- OBS version and operating system.
- Audio sample rate in OBS and for each relevant device.
- Microphone, capture-card, or interface model and how the source is routed.
- Whether “Use Device Timestamps” is available and its state for the affected source.
- Whether the OBS preview, local recording, and YouTube playback each drift.
- How long it takes for the drift to appear and whether the gap grows consistently.
- An OBS log from a representative reproduction.
This evidence helps support distinguish a source-timing problem from a delivery or performance symptom without assuming that a capture card or another component needs replacement.
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