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First identify whether the sync error is fixed or getting worse
Watch or record the stream at more than one point—near the beginning and later on—and compare a sharp event visible on screen and audible in the audio, such as a clap. Check the received stream, not only OBS’s local preview. Note both when the mismatch first appears and whether the gap grows as the stream continues.
- About the same offset throughout: measure the delay. A source-level sync offset may help if the delay is stable.
- The mismatch increases over time: treat this as a timing problem to investigate. A fixed offset shifts audio by a constant amount; it does not correct a gap that keeps growing.
- The received stream is wrong but the local preview looks right: inspect the path from OBS to YouTube, including stream health and delivery, as well as the local capture chain.
- The mismatch is already present in the local preview or recording: focus first on the source devices, their timing settings, and how audio and video enter OBS.
The symptom alone does not identify a universal cause. The source chain, device settings, logs, and a representative test are needed to narrow it down.
Use a realistic test before changing settings
Test with the same resolution, frame rate, camera or capture devices, audio sources, and OBS scenes you plan to use. Include motion and audible events, not just a static preview. YouTube recommends that tests include audio and movement similar to the planned stream and advises monitoring stream health during the event. Its 2160p guidance also says 4K streams are optimized for quality and use normal latency; that latency setting is context, not evidence that it causes audio drift. YouTube’s encoder settings and streaming guidance explains both testing and stream-health checks.
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- Make a private or otherwise controlled test using the intended production setup.
- Produce a few clear audiovisual markers near the start and again later—for example, clap where the camera can see it.
- Review the received stream or its recording at both points. Note whether the offset is steady or has accumulated.
- Check OBS’s preview and any local recording too, to find where the mismatch first appears.
- Change one material setting at a time, then repeat the test with the same workload.
Match capture-source timing to the actual output
If a capture device is in the chain, confirm that its resolution and frame-rate settings match the source signal it receives. AVerMedia’s GC553 setup instructions for OBS specifically say to set capture resolution and FPS according to the actual source. The instructions show rates including 60, 59.94, 30, and 29.97 fps; do not silently treat 59.94 and 60 as interchangeable when configuring a source. These instructions are specific to that device and setup, not a universal diagnosis for every capture card. AVerMedia’s GC553 OBS setup guide shows its configuration and sync-offset procedure.
Also inspect OBS audio settings and the properties of each audio device in the chain. Compare the configured sample rates and any YouTube health messages rather than assuming every device or warning uses the same rate. For YouTube’s documented encoder guidance, stereo audio is 44.1 kHz and 5.1 surround is 48 kHz. The YouTube Live Streaming API also reports sample-rate errors and a mismatch between primary and backup stream sample rates as health/configuration issues. YouTube Help and the YouTube Live Streaming API documentation describe those checks.
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Use YouTube’s 4K60 ingest guidance as a configuration check
These are YouTube’s current live encoder recommendations on its settings page, accessed in 2026. They help check whether the ingest configuration is within platform guidance; they do not, on their own, prevent audio clock drift.
| Setting | YouTube guidance for 2160p at 60 fps |
|---|---|
| Video bitrate | Recommended: 35 Mbps for AV1 or H.265; 50 Mbps for H.264. Minimums: 10 Mbps for AV1 or H.265; 14 Mbps for H.264. |
| Keyframe interval | 2 seconds recommended; do not exceed 4 seconds. |
| Audio sample rate | 44.1 kHz for stereo; 48 kHz for 5.1 surround sound. |
| Audio format | AAC or MP3; 5.1 surround sound is supported only with AAC over RTMP/RTMPS. |
| Latency | YouTube does not offer its low-latency option for 4K/2160p; 4K streams are optimized for quality and set to normal latency. |
Use the row that matches your codec and audio format, and check YouTube’s stream-health diagnostics for the warning actually shown. The API lists issues including audio sample-rate errors, primary/backup sample-rate or frame-rate mismatches, video ingestion starvation, and long keyframe intervals. A warning merits attention, but it should not automatically be treated as the cause of a sync problem. YouTube Help provides encoder recommendations; the API documentation describes health and configuration statuses.
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Correct a stable offset carefully
If testing shows the offset stays roughly constant, adjust the affected audio source’s sync offset in small, measured increments, then repeat the test. In OBS, AVerMedia’s GC553 guide shows the control in Advanced Audio Properties. Its example gives a range of -50 to -200 ms for that particular setup; those values are not a general recommendation for other devices or signal chains. Keep a note of the original setting so you can revert if the result worsens.
If the mismatch grows over time, do not keep changing a fixed offset as though it were a drift correction. Check the clocks and configuration of the devices feeding OBS, the capture route, source frame rates, audio sample rates, and OBS logs. The distinction between a constant offset and accumulating drift is a practical diagnostic; the cited platform and vendor guidance does not establish one universal root cause or fix for progressive drift.
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Separate dropped frames from audio-sync adjustment
OBS describes dropped frames as a sign that the connection to the remote ingest server is unstable or cannot sustain the configured bitrate. If OBS reports drops, investigate upload capacity and network stability, and try a bitrate your connection can sustain. OBS says dynamic bitrate may help avoid drops, but it is a fallback rather than a root-cause fix and can reduce video quality. Network delivery trouble and audio timing can coexist, but lowering bitrate is not proof that a device-clock problem has been fixed. See the OBS Stream Connection Troubleshooting guide.
Troubleshooting: symptom, likely area, and next check
| What you see | What to check next |
|---|---|
| Audio is late or early by a similar amount at the start and later in the test. | Measure the offset and adjust the affected source’s OBS sync offset in small increments; retest the received stream. |
| Audio and video separate progressively over time. | Inspect capture timing, device clocks, audio-device settings, sample rates, source frame rates, and the route into OBS. A constant offset is not a drift fix. |
| OBS preview is aligned but the received stream is not. | Review YouTube stream health and OBS connection/dropped-frame indicators; compare the settings and received recording. |
| A capture source is set to 60 fps, but the input actually runs at 59.94 fps, or the rates otherwise differ. | Set the capture source according to the actual source output. Verify the rate rather than rounding it. |
| YouTube reports a sample-rate, frame-rate, starvation, or keyframe warning. | Address the specific health message and compare the affected stream settings with YouTube’s encoder guidance. Do not assume the warning alone explains the sync symptom. |
| OBS reports dropped frames during the stream. | Investigate network stability and whether upload can sustain the configured bitrate; lower it if needed, understanding the quality trade-off. |
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