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First distinguish fixed delay from progressive drift
Use repeatable events that pair a visible action with a distinct sound, such as a hand clap in frame. Compare the sync near the start with the same kind of event later. Note whether the sound leads or trails the picture and by how much.
- Nearly constant offset: The audio and video are out of sync by about the same amount throughout. Measure the difference, identify which signal arrives first, then adjust the relevant OBS source if needed.
- Increasing offset: The gap grows as the stream continues. A fixed sync offset may align the beginning but will not stop the gap from increasing. Investigate device timing and whether audio and video travel through separate capture paths.
This distinction is a practical diagnostic, not a universal YouTube diagnosis. Compare a local recording with the delivered stream to determine whether the mismatch is already present before YouTube receives it.
Reproduce the problem before changing settings
- Match the real signal path. Make a local recording and a private or unlisted stream test using the same camera, capture device, microphone, audio routing, OBS scenes, frame rate, and other relevant settings as the planned broadcast.
- Include representative action and sound. YouTube advises: “Tests should include audio and movement in the video similar to what you’ll be doing in the stream.” A short static test may miss a problem that appears only during sustained operation.
- Test long enough to observe the reported failure. Continue through the time at which drift normally becomes noticeable, if possible. YouTube does not specify a minimum test duration for drift.
- Record checkpoints. Note the sync at the beginning and at later points, along with OBS settings, active audio sources, sample rates, and any OBS or YouTube warnings. Change one part of the setup at a time and repeat the same test.
Check audio routing and sample-rate consistency
Inspect OBS audio settings and the operating-system or device format for every active input. Confirm which audio source actually reaches the stream. A capture device may carry audio while the same microphone or source is also added separately; duplicate paths can make diagnosis harder.
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Keep sample-rate choices consistent across the encoder and inputs, and follow the instructions for the specific hardware. YouTube’s encoder guidance lists 44.1 kHz for stereo and 48 kHz for 5.1, while Elgato’s setup guide for the 4K60 Pro MK.2 says to set OBS to 48 kHz. These are context-specific instructions, not evidence that one sample rate alone prevents drift. YouTube’s [Live health diagnostics](https://developers.google.com/youtube/v3/live/docs/liveStreams/health_status_messages) identify sample-rate mismatch as a possible issue.
Verify the YouTube and OBS baseline
YouTube encoder settings
Use the current [YouTube encoder guidance](https://support.google.com/youtube/answer/2853702?hl=en-EN) for the resolution, frame rate, codec, and bitrate applicable to your encoder and stream. The guidance recommends a 2-second keyframe frequency and says not to exceed 4 seconds. Bitrate figures can vary across localized or updated versions of YouTube’s page, so consult the current table for your region rather than relying on an unverified number.
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For 4K / 2160p at 60 fps, YouTube’s low-latency option is unavailable; the stream uses normal latency. YouTube states: “For 4K / 2160, the option to improve for low latency is not available.” Delivery latency is not the same thing as local progressive audio drift, so switching latency modes is not a general drift fix. See [YouTube’s latency guidance](https://support.google.com/youtube/answer/7444635?hl=en-WS).
OBS performance and connection symptoms
Check OBS statistics and YouTube stream health as separate diagnostic sources. OBS recommends simplifying scenes or reducing output resolution or frame rate when the system cannot render or encode reliably. As OBS notes, “Frame rate also impacts both rendering and encoding performance.” Its [encoding performance guide](https://obsproject.com/kb/encoding-performance-troubleshooting) explains performance troubleshooting.
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Dropped frames and intermittent disconnections point to a network problem between the computer and ingest server, according to OBS’s [connection troubleshooting guide](https://obsproject.com/kb/stream-connection-troubleshooting). These symptoms can disrupt a stream, but they do not by themselves prove an audio clock mismatch. Compare the local recording with the delivered stream to find where the mismatch first appears.
When an audio sync offset helps—and when it does not
Use a sync adjustment only after measuring a stable offset and confirming which signal is early. Adjust the appropriate OBS source, then repeat the test and verify both the start and later checkpoints. Avoid copying a delay value from another streamer or capture card: actual latency depends on the device and system configuration.
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If the offset steadily increases, changing a fixed offset only shifts the starting point. Check the active device and the separate audio and video paths instead. OBS’s [capture-card resource](https://obsproject.com/forum/resources/capture-card-documentation-latency-decode-modes-formats-more.777/) cautions that latency values are not static. Measure your own setup before considering hardware changes; no purchase is established as a general cure.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Use the evidence to choose the next correction
- Mismatch is in the local recording and stream: Focus on the computer, OBS, source devices, and routing before changing YouTube settings.
- Local recording is in sync, but the delivered stream is not: Compare the stream test and YouTube health diagnostics, then check the encoder configuration and signal path.
- Offset is stable: Measure it and adjust the relevant source, then verify the result over the same sustained test.
- Offset grows: Inspect device timing, separate audio/video capture paths, duplicate inputs, and sample-rate configuration.
- OBS reports rendering or encoding strain: Simplify scenes or reduce workload as needed; then retest.
- OBS reports dropped frames or disconnections: Troubleshoot the computer-to-ingest network connection separately from audio timing.
Change one path at a time and keep notes of the sync measurements and warnings. That makes it easier to identify which adjustment actually affects the drift.
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